# VirtualServer and VirtualServerRoute resources

Type of document: Reference
Product: NGINX Ingress Controller

---


This document is reference material for the VirtualServer and VirtualServerRoute resources used by F5 NGINX Ingress Controller LTS.

VirtualServer and VirtualServerRoute resources are load balancing configurations recommended as an alternative to the Ingress resource.

They enable use cases not supported with the Ingress resource, such as traffic splitting and advanced content-based routing. The resources are implemented as [Custom Resources](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/).

The GitHub repository has [examples of the resources](https://github.com/nginx/kubernetes-ingress/tree/v/examples/custom-resources) for specific use cases.

---

## VirtualServer specification

The VirtualServer resource defines load balancing configuration for a domain name, such as `example.com`. The example below shows a VirtualServer with both traditional static routes and a dynamic route using `routeSelector`. The route with path `/dynamic` will automatically include any VirtualServerRoute resources that have the label `app: cafe`:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
spec:
  host: cafe.example.com
  listener:
    http: http-8083
    https: https-8443
  tls:
    secret: cafe-secret
  gunzip: on
  upstreams:
  - name: tea
    service: tea-svc
    port: 80
  - name: coffee
    service: coffee-svc
    port: 80
  routes:
  - path: /tea
    action:
      pass: tea
  - path: /coffee
    action:
      pass: coffee
  - path: ~ ^/decaf/.*\\.jpg$
    action:
      pass: coffee
  - path: =/green/tea
    action:
      pass: tea
  - path: /dynamic
    routeSelector:
      matchLabels:
        app: cafe
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``host`` | The host (domain name) of the server. Must be a valid subdomain as defined in RFC 1123, such as ``my-app`` or ``hello.example.com``. When using a wildcard domain like ``*.example.com`` the domain must be contained in double quotes. The ``host`` value needs to be unique among all Ingress and VirtualServer resources. See also [Handling Host and Listener Collisions](/nic/lts/configuration/host-and-listener-collisions.md). | ``string`` | Yes |
|``listener`` | Sets a custom HTTP and/or HTTPS listener. Valid fields are `listener.http` and `listener.https`. Each field must reference the name of a valid listener defined in a GlobalConfiguration resource | [listener](#virtualserverlistener) | No |
|``tls`` | The TLS termination configuration. | [tls](#virtualservertls) | No |
|``gunzip`` | Enables or disables [decompression](/nginx/admin-guide/web-server/compression.md) of gzipped responses for clients. Allowed values “on”/“off”, “true”/“false” or “yes”/“no”. If the ``gunzip`` value is not set, it defaults to ``off``.   | ``boolean`` | No |
|``externalDNS`` | The externalDNS configuration for a VirtualServer. | [externalDNS](#virtualserverexternaldns) | No |
|``dos`` | A reference to a DosProtectedResource, setting this enables DOS protection of the VirtualServer. | ``string`` | No |
|``policies`` | A list of policies. | [[]policy](#virtualserverpolicy) | No |
|``upstreams`` | A list of upstreams. | [[]upstream](#upstream) | No |
|``routes`` | A list of routes. | [[]route](#virtualserverroute) | No |
|``ingressClassName`` | Specifies which Ingress Controller must handle the VirtualServer resource. | ``string`` | No |
|``internalRoute`` | Specifies if the VirtualServer resource is an internal route or not. | ``boolean`` | No |
|``http-snippets`` | Sets a custom snippet in the http context. | ``string`` | No |
|``server-snippets`` | Sets a custom snippet in server context. Overrides the ``server-snippets`` ConfigMap key. | ``string`` | No |

### VirtualServer.TLS

The tls field defines TLS configuration for a VirtualServer. For example:

```yaml
secret: cafe-secret
redirect:
  enable: true
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``secret`` | The name of a secret with a TLS certificate and key. The secret must belong to the same namespace as the VirtualServer. The secret must be of the type ``kubernetes.io/tls`` and contain keys named ``tls.crt`` and ``tls.key`` that contain the certificate and private key as described [here](https://kubernetes.io/docs/concepts/services-networking/ingress/#tls). If the secret doesn't exist or is invalid, NGINX will break any attempt to establish a TLS connection to the host of the VirtualServer. If the secret is not specified but [wildcard TLS secret](/nic/lts/configuration/global-configuration/command-line-arguments.md#cmdoption-wildcard-tls-secret) is configured, NGINX will use the wildcard secret for TLS termination. | ``string`` | No |
|``redirect`` | The redirect configuration of the TLS for a VirtualServer. | [tls.redirect](#virtualservertlsredirect) | No | ### VirtualServer.TLS.Redirect |
|``cert-manager`` | The cert-manager configuration of the TLS for a VirtualServer. | [tls.cert-manager](#virtualservertlscertmanager) | No | ### VirtualServer.TLS.CertManager |

### VirtualServer.TLS.Redirect

The redirect field configures a TLS redirect for a VirtualServer:

```yaml
enable: true
code: 301
basedOn: scheme
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``enable`` | Enables a TLS redirect for a VirtualServer. The default is ``False``. | ``boolean`` | No |
|``code`` | The status code of a redirect. The allowed values are: ``301`` , ``302`` , ``307`` , ``308``.  The default is ``301``. | ``int`` | No |
|``basedOn`` | The attribute of a request that NGINX will evaluate to send a redirect. The allowed values are ``scheme`` (the scheme of the request) or ``x-forwarded-proto`` (the ``X-Forwarded-Proto`` header of the request). The default is ``scheme``. | ``string`` | No | ### VirtualServer.Policy |

### VirtualServer.TLS.CertManager

The cert-manager field configures x509 automated Certificate management for VirtualServer resources using cert-manager (cert-manager.io). Please see the [cert-manager configuration documentation](https://cert-manager.io/docs/configuration/) for more information on deploying and configuring Issuers. Example:

```yaml
cert-manager:
  cluster-issuer: "my-issuer-name"
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``issuer`` |  the name of an Issuer. An Issuer is a cert-manager resource which describes the certificate authority capable of signing certificates. The Issuer must be in the same namespace as the VirtualServer resource. Please note that one of `issuer` and `cluster-issuer` are required, but they are mutually exclusive - one and only one must be defined. | ``string`` | No |
|``cluster-issuer`` | the name of a ClusterIssuer. A ClusterIssuer is a cert-manager resource which describes the certificate authority capable of signing certificates. It does not matter which namespace your VirtualServer resides, as ClusterIssuers are non-namespaced resources. Please note that one of `issuer` and `cluster-issuer` are required, but they are mutually exclusive - one and only one must be defined. | ``string`` | No |
|``issuer-kind`` | The kind of the external issuer resource, for example AWSPCAIssuer. This is only necessary for out-of-tree issuers. This cannot be defined if `cluster-issuer` is also defined. | ``string`` | No |
|``issuer-group`` | The API group of the external issuer controller, for example awspca.cert-manager.io. This is only necessary for out-of-tree issuers. This cannot be defined if `cluster-issuer` is also defined. | ``string`` | No |
|``common-name`` | This field allows you to configure spec.commonName for the Certificate to be generated. This configuration adds a CN to the x509 certificate. | ``string`` | No |
|``duration`` | This field allows you to configure spec.duration field for the Certificate to be generated. Must be specified using a [Go time.Duration](https://pkg.go.dev/time#ParseDuration) string format, which does not allow the d (days) suffix. You must specify these values using s, m, and h suffixes instead. | ``string`` | No |
|``renew-before`` |  this annotation allows you to configure spec.renewBefore field for the Certificate to be generated. Must be specified using a [Go time.Duration](https://pkg.go.dev/time#ParseDuration) string format, which does not allow the d (days) suffix. You must specify these values using s, m, and h suffixes instead. | ``string`` | No |
|``usages`` |  This field allows you to configure spec.usages field for the Certificate to be generated. Pass a string with comma-separated values i.e. ``key agreement,digital signature, server auth``. An exhaustive list of supported key usages can be found in the [the cert-manager api documentation](https://cert-manager.io/docs/reference/api-docs/#cert-manager.io/v1.KeyUsage). | ``string`` | No |
|``issue-temp-cert`` | When ``true``, ask cert-manager for a [temporary self-signed certificate](https://cert-manager.io/docs/usage/certificate/#temporary-certificates-while-issuing) pending the issuance of the Certificate. This allows HTTPS-only servers to use ACME HTTP01 challenges when the TLS secret does not exist yet. | ``boolean`` | No |

### VirtualServer.Listener

The listener field defines a custom HTTP and/or HTTPS listener.
The respective listeners used must reference the name of a listener defined using a [GlobalConfiguration](/nic/lts/configuration/global-configuration/globalconfiguration-resource.md) resource.
For example:

```yaml
http: http-8083
https: https-8443
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``http`` |  The name of am HTTP listener defined in a [GlobalConfiguration](/nic/lts/configuration/global-configuration/globalconfiguration-resource.md) resource. | ``string`` | No |
|``https`` |  The name of an HTTPS listener defined in a [GlobalConfiguration](/nic/lts/configuration/global-configuration/globalconfiguration-resource.md) resource. | ``string`` | No |

### VirtualServer.ExternalDNS

The externalDNS field configures controlling DNS records dynamically for VirtualServer resources using [ExternalDNS](https://github.com/kubernetes-sigs/external-dns). Please see the [ExternalDNS configuration documentation](https://kubernetes-sigs.github.io/external-dns/) for more information on deploying and configuring ExternalDNS and Providers. Example:

```yaml
enable: true
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``enable`` | Enables ExternalDNS integration for a VirtualServer resource. The default is ``false``. | ``string`` | No |
|``labels`` | Configure labels to be applied to the Endpoint resources that will be consumed by ExternalDNS. | ``map[string]string`` | No |
|``providerSpecific`` | Configure provider specific properties which holds the name and value of a configuration which is specific to individual DNS providers. | [[]ProviderSpecific](#virtualserverexternaldnsproviderspecific) | No |
|``recordTTL`` | TTL for the DNS record. This defaults to 0 if not defined. See [the ExternalDNS TTL documentation for provider-specific defaults](https://kubernetes-sigs.github.io/external-dns/v0.14.2/ttl/#providers) | ``int64`` | No |
|``recordType`` | The record Type that should be created, e.g. "A", "AAAA", "CNAME". This is automatically computed based on the external endpoints if not defined. | ``string`` | No |

### VirtualServer.ExternalDNS.ProviderSpecific

The providerSpecific field of the externalDNS block allows the specification of provider specific properties which is a list of key value pairs of configurations which are specific to individual DNS providers. Example:

```yaml
- name: my-name
  value: my-value
- name: my-name2
  value: my-value2
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the key value pair. | ``string`` | Yes |
|``value`` | The value of the key value pair. | ``string`` | Yes |

### VirtualServer.Policy

The policy field references a [Policy resource](/nic/lts/configuration/policy-resource.md) by its name and optional namespace. For example:

```yaml
name: access-control
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of a policy. If the policy doesn't exist or invalid, NGINX will respond with an error response with the `500` status code. | ``string`` | Yes |
|``namespace`` | The namespace of a policy. If not specified, the namespace of the VirtualServer resource is used. | ``string`` | No |

### VirtualServer.Route

The route defines rules for matching client requests to actions like passing a request to an upstream. For example:

```yaml
  path: /tea
  action:
    pass: tea
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``path`` | The path of the route. NGINX will match it against the URI of a request. Possible values are: a prefix ( ``/`` , ``/path`` ), an exact match ( ``=/exact/match`` ), a case insensitive regular expression ( ``~*^/Bar.*\.jpg`` ) or a case sensitive regular expression ( ``~^/foo.*\.jpg`` ). In the case of a prefix (must start with ``/`` ) or an exact match (must start with ``=`` ), the path must not include any whitespace characters, ``{`` , ``}`` or ``;``. In the case of the regex matches, all double quotes ``"`` must be escaped and the match can't end in an unescaped backslash ``\``. The path must be unique among the paths of all routes of the VirtualServer. Check the [location](https://nginx.org/en/docs/http/ngx_http_core_module.html#location) directive for more information. | ``string`` | Yes |
|``policies`` | A list of policies. The policies override the policies of the same type defined in the ``spec`` of the VirtualServer. See [Applying Policies](/nic/lts/configuration/policy-resource.md#applying-policies) for more details. | [[]policy](#virtualserverpolicy) | No |
|``action`` | The default action to perform for a request. | [action](#action) | No |
|``dos`` | A reference to a DosProtectedResource, setting this enables DOS protection of the VirtualServer route. | ``string`` | No |
|``splits`` | The default splits configuration for traffic splitting. Must include at least 2 splits. | [[]split](#split) | No |
|``matches`` | The matching rules for advanced content-based routing. Requires the default ``action`` or ``splits``.  Unmatched requests will be handled by the default ``action`` or ``splits``. | [matches](#match) | No |
|``route`` | The name of a VirtualServerRoute resource that defines this route. If the VirtualServerRoute belongs to a different namespace than the VirtualServer, you need to include the namespace. For example, ``tea-namespace/tea``. | ``string`` | No |
|``routeSelector`` | The RouteSelector allows selecting VirtualServerRoute resources using label selectors instead of specifying them by name and namespace. | [routeSelector](#virtualserverrouterouteselector) | No |
|``errorPages`` | The custom responses for error codes. NGINX will use those responses instead of returning the error responses from the upstream servers or the default responses generated by NGINX. A custom response can be a redirect or a canned response. For example, a redirect to another URL if an upstream server responded with a 404 status code. | [[]errorPage](#errorpage) | No |
|``location-snippets`` | Sets a custom snippet in the location context. Overrides the ``location-snippets`` ConfigMap key. | ``string`` | No |

\* -- a route must include exactly one of the following: `action`, `splits`, `route` or `routeSelector`

### VirtualServer.Route.RouteSelector

The RouteSelector field allows you to dynamically select VirtualServerRoute resources using label selectors instead of specifying them by name and namespace. This provides a more flexible and scalable way to associate VirtualServerRoutes with a VirtualServer route.

See the [VirtualServerRoute specification](#virtualserverroute-specification) section below for examples of how to use RouteSelector with VirtualServerRoute resources.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``matchLabels`` | A map of key-value pairs. Each key-value pair in the matchLabels map is equivalent to an element of matchExpressions, whose key field is "key", the operator is "In", and the values array contains only "value". The requirements are ANDed. | ``map[string]string`` | Yes |
|``matchExpressions`` | A list of label selector requirements. The requirements are ANDed. For more information on label selector requirements, see the [Kubernetes documentation](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#resources-that-support-set-based-requirements). | N/A | No |

## VirtualServerRoute specification

The VirtualServerRoute resource defines a route for a VirtualServer. It can consist of one or multiple subroutes. The VirtualServerRoute is an alternative to [Mergeable Ingress types](/nic/lts/configuration/ingress-resources/cross-namespace-configuration.md).

VirtualServer routes can reference VirtualServerRoute resources in two ways: by name using the `route` field, or dynamically using the `routeSelector` field with label selectors. The `routeSelector` approach allows you to add new VirtualServerRoute resources without modifying the VirtualServer configuration.

#### Standard

In this example, the VirtualServer `cafe` from the namespace `cafe-ns` defines a route that references a specific VirtualServerRoute by name.

VirtualServer:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
  namespace: cafe-ns
spec:
  host: cafe.example.com
  upstreams:
  - name: tea
    service: tea-svc
    port: 80
  routes:
  - path: /tea
    action:
      pass: tea
  - path: /coffee
    route: coffee-ns/coffee
```

VirtualServerRoute:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServerRoute
metadata:
  name: coffee
  namespace: coffee-ns
spec:
  host: cafe.example.com
  upstreams:
  - name: latte
    service: latte-svc
    port: 80
  - name: espresso
    service: espresso-svc
    port: 80
  subroutes:
  - path: /coffee/latte
    action:
      pass: latte
  - path: /coffee/espresso
    action:
      pass: espresso
```

#### RouteSelector

In this example, the VirtualServer `cafe` from the namespace `cafe-ns` uses `routeSelector` to dynamically select any VirtualServerRoute with the label `app: coffee`.

VirtualServer:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
  namespace: cafe-ns
spec:
  host: cafe.example.com
  upstreams:
  - name: tea
    service: tea-svc
    port: 80
  routes:
  - path: /tea
    action:
      pass: tea
  - path: /decaf
    routeSelector:
      matchLabels:
        app: coffee
```

VirtualServerRoute:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServerRoute
metadata:
  name: decaf
  namespace: coffee-ns
  labels:
    app: coffee
spec:
  host: cafe.example.com
  upstreams:
  - name: latte
    service: latte-svc
    port: 80
  - name: espresso
    service: espresso-svc
    port: 80
  subroutes:
  - path: /decaf/latte
    action:
      pass: latte
  - path: /decaf/espresso
    action:
      pass: espresso
```

Note that each subroute must have a `path` that starts with the same prefix (here `/coffee`), which is defined in the route of the VirtualServer. Additionally, the `host` in the VirtualServerRoute must be the same as the `host` of the VirtualServer.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``host`` | The host (domain name) of the server. Must be a valid subdomain as defined in RFC 1123, such as ``my-app`` or ``hello.example.com``. When using a wildcard domain like ``*.example.com`` the domain must be contained in double quotes. Must be the same as the ``host`` of the VirtualServer that references this resource. | ``string`` | Yes |
|``upstreams`` | A list of upstreams. | [[]upstream](#upstream) | No |
|``subroutes`` | A list of subroutes. | [[]subroute](#virtualserverroutesubroute) | No |
|``ingressClassName`` | Specifies which Ingress Controller must handle the VirtualServerRoute resource. Must be the same as the ``ingressClassName`` of the VirtualServer that references this resource. | ``string``_ | No |

### VirtualServerRoute.Subroute

The subroute defines rules for matching client requests to actions like passing a request to an upstream. For example:

```yaml
path: /coffee
action:
  pass: coffee
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``path`` | The path of the subroute. NGINX will match it against the URI of a request. Possible values are: a prefix ( ``/`` , ``/path`` ), an exact match ( ``=/exact/match`` ), a case insensitive regular expression ( ``~*^/Bar.*\.jpg`` ) or a case sensitive regular expression ( ``~^/foo.*\.jpg`` ). In the case of a prefix, the path must start with the same path as the path of the route of the VirtualServer that references this resource. In the case of an exact or regex match, the path must be the same as the path of the route of the VirtualServer that references this resource. A matching path of the route of the VirtualServer but in different type is not accepted, e.g. a regex path (`~/match`) cannot be used with a prefix path in VirtualServer (`/match`) In the case of a prefix or an exact match, the path must not include any whitespace characters, ``{`` , ``}`` or ``;``.  In the case of the regex matches, all double quotes ``"`` must be escaped and the match can't end in an unescaped backslash ``\``. The path must be unique among the paths of all subroutes of the VirtualServerRoute. | ``string`` | Yes |
|``policies`` | A list of policies. The policies override *all* policies defined in the route of the VirtualServer that references this resource. The policies also override the policies of the same type defined in the ``spec`` of the VirtualServer. See [Applying Policies](/nic/lts/configuration/policy-resource.md#applying-policies) for more details. | [[]policy](#virtualserverpolicy) | No |
|``action`` | The default action to perform for a request. | [action](#action) | No |
|``dos`` | A reference to a DosProtectedResource, setting this enables DOS protection of the VirtualServerRoute subroute. | ``string`` | No |
|``splits`` | The default splits configuration for traffic splitting. Must include at least 2 splits. | [[]split](#split) | No |
|``matches`` | The matching rules for advanced content-based routing. Requires the default ``action`` or ``splits``.  Unmatched requests will be handled by the default ``action`` or ``splits``. | [matches](#match) | No |
|``errorPages`` | The custom responses for error codes. NGINX will use those responses instead of returning the error responses from the upstream servers or the default responses generated by NGINX. A custom response can be a redirect or a canned response. For example, a redirect to another URL if an upstream server responded with a 404 status code. | [[]errorPage](#errorpage) | No |
|``location-snippets`` | Sets a custom snippet in the location context. Overrides the ``location-snippets`` of the VirtualServer (if set) or the ``location-snippets`` ConfigMap key. | ``string`` | No |

\* -- a subroute must include exactly one of the following: `action` or `splits`.

## Common VirtualServer and VirtualServerRoute specifications

### Upstream

The upstream defines a destination for the routing configuration. For example:

```yaml
name: tea
service: tea-svc
subselector:
  version: canary
port: 80
lb-method: round_robin
fail-timeout: 10s
max-fails: 1
max-conns: 32
keepalive: 32
connect-timeout: 30s
read-timeout: 30s
send-timeout: 30s
next-upstream: "error timeout non_idempotent"
next-upstream-timeout: 5s
next-upstream-tries: 10
client-max-body-size: 2m
tls:
  enable: true
```

**Note**: The WebSocket protocol is supported without any additional configuration.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the upstream. Must be a valid DNS label as defined in RFC 1035. For example, ``hello`` and ``upstream-123`` are valid. The name must be unique among all upstreams of the resource. | ``string`` | Yes |
|``service`` | The name of a [service](https://kubernetes.io/docs/concepts/services-networking/service/). If the Service belongs to a different namespace than the VirtualServer or VirtualServerRoute, you need to include the namespace. For example, ``tea-namespace/tea``. If the service doesn't exist, NGINX will assume the service has zero endpoints and return a ``502`` response for requests for this upstream. Services of type [ExternalName](https://kubernetes.io/docs/concepts/services-networking/service/#externalname) are also supported in the same namespace (check the [prerequisites](https://github.com/nginx/kubernetes-ingress/tree/v/examples/ingress-resources/externalname-services#prerequisites) ). | ``string`` | Yes |
|``subselector`` | Selects the pods within the service using label keys and values. By default, all pods of the service are selected. Note: the specified labels are expected to be present in the pods when they are created. If the pod labels are updated, NGINX Ingress Controller LTS will not see that change until the number of the pods is changed. | ``map[string]string`` | No |
|``use-cluster-ip`` | Enables using the Cluster IP and port of the service instead of the default behavior of using the IP and port of the pods. When this field is enabled, the fields that configure NGINX behavior related to multiple upstream servers (like ``lb-method`` and ``next-upstream``) will have no effect, as NGINX Ingress Controller LTS will configure NGINX with only one upstream server that will match the service Cluster IP. | ``boolean`` | No |
|``port`` | The port of the service. If the service doesn't define that port, NGINX will assume the service has zero endpoints and return a ``502`` response for requests for this upstream. The port must fall into the range ``1..65535``. | ``uint16`` | Yes |
|``lb-method`` | The load [balancing method](/nginx/admin-guide/load-balancer/http-load-balancer.md#choosing-a-load-balancing-method). To use the round-robin method, specify ``round_robin``. The default is specified in the ``lb-method`` ConfigMap key. | ``string`` | No |
|``fail-timeout`` | The time during which the specified number of unsuccessful attempts to communicate with an upstream server should happen to consider the server unavailable. See the [fail_timeout](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#fail_timeout) parameter of the server directive. The default is set in the ``fail-timeout`` ConfigMap key. | ``string`` | No |
|``max-fails`` | The number of unsuccessful attempts to communicate with an upstream server that should happen in the duration set by the ``fail-timeout`` to consider the server unavailable. See the [max_fails](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#max_fails) parameter of the server directive. The default is set in the ``max-fails`` ConfigMap key. | ``int`` | No |
|``max-conns`` | The maximum number of simultaneous active connections to an upstream server. See the [max_conns](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#max_conns) parameter of the server directive. By default there is no limit. Note: if keepalive connections are enabled, the total number of active and idle keepalive connections to an upstream server may exceed the ``max_conns`` value. | ``int`` | No |
|``keepalive`` | Configures the cache for connections to upstream servers. The value ``0`` disables the cache. See the [keepalive](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive) directive. The default is set in the ``keepalive`` ConfigMap key. | ``int`` | No |
|``connect-timeout`` | The timeout for establishing a connection with an upstream server. See the [proxy_connect_timeout](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_connect_timeout) directive. The default is specified in the ``proxy-connect-timeout`` ConfigMap key. | ``string`` | No |
|``read-timeout`` | The timeout for reading a response from an upstream server. See the [proxy_read_timeout](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout) directive.  The default is specified in the ``proxy-read-timeout`` ConfigMap key. | ``string`` | No |
|``send-timeout`` | The timeout for transmitting a request to an upstream server. See the [proxy_send_timeout](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout) directive. The default is specified in the ``proxy-send-timeout`` ConfigMap key. | ``string`` | No |
|``next-upstream`` | Specifies in which cases a request should be passed to the next upstream server. See the [proxy_next_upstream](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream) directive. The default is ``error timeout``. | ``string`` | No |
|``next-upstream-timeout`` | The time during which a request can be passed to the next upstream server. See the [proxy_next_upstream_timeout](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream_timeout) directive. The ``0`` value turns off the time limit. The default is ``0``. | ``string`` | No |
|``next-upstream-tries`` | The number of possible tries for passing a request to the next upstream server. See the [proxy_next_upstream_tries](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream_tries) directive. The ``0`` value turns off this limit. The default is ``0``. | ``int`` | No |
|``client-max-body-size`` | Sets the maximum allowed size of the client request body. See the [client_max_body_size](https://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size) directive. The default is set in the ``client-max-body-size`` ConfigMap key. | ``string`` | No |
|``client-body-buffer-size`` | Sets the value of the [client_body_buffer_size](https://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_buffer_size) directive. The default is set in the ``client-body-buffer-size`` ConfigMap key. | ``string`` | No |
|``tls`` | The TLS configuration for the Upstream. | [tls](#upstreamtls) | No |
|``healthCheck`` | The health check configuration for the Upstream. See the [health_check](https://nginx.org/en/docs/http/ngx_http_upstream_hc_module.html#health_check) directive. | [healthcheck](#upstreamhealthcheck) | No |
|``slow-start`` | The slow start allows an upstream server to gradually recover its weight from 0 to its nominal value after it has been recovered or became available or when the server becomes available after a period of time it was considered unavailable. By default, the slow start is disabled. See the [slow_start](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#slow_start) parameter of the server directive. Note: The parameter cannot be used along with the ``random`` , ``hash`` or ``ip_hash`` load balancing methods and will be ignored. | ``string`` | No |
|``queue`` | Configures a queue for an upstream. A client request will be placed into the queue if an upstream server cannot be selected immediately while processing the request. By default, no queue is configured. | [queue](#upstreamqueue) | No |
|``buffering`` | Enables buffering of responses from the upstream server. See the [proxy_buffering](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering) directive. The default is set in the ``proxy-buffering`` ConfigMap key. | ``boolean`` | No |
|``buffers`` | Configures the buffers used for reading a response from the upstream server for a single connection. | [buffers](#upstreambuffers) | No |
|``buffer-size`` | Sets the size of the buffer used for reading the first part of a response received from the upstream server. See the [proxy_buffer_size](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size) directive. The default is set in the ``proxy-buffer-size`` ConfigMap key. | ``string`` | No |
|``busy-buffers-size`` | Sets the size of the buffer used for reading a response from the upstream server when the response is larger than the ``buffer-size``. See the [proxy_busy_buffers_size](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_busy_buffers_size) directive. The default is set in the ``proxy-busy-buffers-size`` ConfigMap key. | ``string`` | No |
|``ntlm`` | Allows proxying requests with NTLM Authentication. See the [ntlm](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#ntlm) directive. In order for NTLM authentication to work, it is necessary to enable keepalive connections to upstream servers using the ``keepalive`` field. | ``boolean`` | No |
|``type`` |The type of the upstream. Supported values are ``http`` and ``grpc``. The default is ``http``. For gRPC, it is necessary to enable HTTP/2 in the [ConfigMap](/nic/lts/configuration/global-configuration/configmap-resource.md#listeners) and configure TLS termination in the VirtualServer. | ``string`` | No |
|``backup`` | The name of the backup service of type [ExternalName](https://kubernetes.io/docs/concepts/services-networking/service/#externalname). This will be used when the primary servers are unavailable. Note: The parameter cannot be used along with the ``random`` , ``hash`` or ``ip_hash`` load balancing methods. | ``string`` | No |
|``backupPort`` | The port of the backup service. The backup port is required if the backup service name is provided. The port must fall into the range ``1..65535``. | ``uint16`` | No |

### Upstream.Buffers

The buffers field configures the buffers used for reading a response from the upstream server for a single connection:

```yaml
number: 4
size: 8K
```

See the [proxy_buffers](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffers) directive for additional information.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``number`` | Configures the number of buffers. The default is set in the ``proxy-buffers`` ConfigMap key. | ``int`` | Yes |
|``size`` | Configures the size of a buffer. The default is set in the ``proxy-buffers`` ConfigMap key. | ``string`` | Yes |

### Upstream.TLS

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``enable`` | Enables HTTPS for requests to upstream servers. The default is ``False`` , meaning that HTTP will be used. Note: by default, NGINX will not verify the upstream server certificate. To enable the verification, configure an [EgressMTLS Policy](/nic/lts/configuration/policy-resource/#egressmtls). | ``boolean`` | No |

### Upstream.Queue

The queue field configures a queue. A client request will be placed into the queue if an upstream server cannot be selected immediately while processing the request:

```yaml
size: 10
timeout: 60s
```

See [`queue`](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#queue) directive for additional information.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``size`` | The size of the queue. | ``int`` | Yes |
|``timeout`` | The timeout of the queue. A request cannot be queued for a period longer than the timeout. The default is ``60s``. | ``string`` | No |

### Upstream.Healthcheck

The Healthcheck defines an [active health check](/nginx/admin-guide/load-balancer.md#http-health-check). In the example below we enable a health check for an upstream and configure all the available parameters, including the `slow-start` parameter combined with [`mandatory` and `persistent`](/nginx/admin-guide/load-balancer/http-health-check.md#mandatory-health-checks):

```yaml
name: tea
service: tea-svc
port: 80
slow-start: 30s
healthCheck:
  enable: true
  path: /healthz
  interval: 20s
  jitter: 3s
  fails: 5
  passes: 5
  port: 8080
  tls:
    enable: true
  connect-timeout: 10s
  read-timeout: 10s
  send-timeout: 10s
  headers:
  - name: Host
    value: my.service
  statusMatch: "! 500"
  mandatory: true
  persistent: true
  keepalive-time: 60s
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``enable`` | Enables a health check for an upstream server. The default is ``false``. | ``boolean`` | No |
|``path`` | The path used for health check requests. The default is ``/``. This not configurable for gRPC type upstreams. | ``string`` | No |
|``interval`` | The interval between two consecutive health checks. The default is ``5s``. | ``string`` | No |
|``jitter`` | The time within which each health check will be randomly delayed. By default, there is no delay. | ``string`` | No |
|``fails`` | The number of consecutive failed health checks of a particular upstream server after which this server will be considered unhealthy. The default is ``1``. | ``integer`` | No |
|``passes`` | The number of consecutive passed health checks of a particular upstream server after which the server will be considered healthy. The default is ``1``. | ``integer`` | No |
|``port`` | The port used for health check requests. By default, the [server port is used](https://nginx.org/en/docs/http/ngx_http_upstream_hc_module.html#health_check_port). Note: in contrast with the port of the upstream, this port is not a service port, but a port of a pod. | ``integer`` | No |
|``tls`` | The TLS configuration used for health check requests. By default, the ``tls`` field of the upstream is used. | [upstream.tls](#upstreamtls) | No |
|``connect-timeout`` | The timeout for establishing a connection with an upstream server. By default, the ``connect-timeout`` of the upstream is used. | ``string`` | No |
|``read-timeout`` | The timeout for reading a response from an upstream server. By default, the ``read-timeout`` of the upstream is used. | ``string`` | No |
|``send-timeout`` | The timeout for transmitting a request to an upstream server. By default, the ``send-timeout`` of the upstream is used. | ``string`` | No |
|``headers`` | The request headers used for health check requests. NGINX Plus always sets the ``Host`` , ``User-Agent`` and ``Connection`` headers for health check requests. | [[]header](#header) | No |
|``statusMatch`` | The expected response status codes of a health check. By default, the response should have status code 2xx or 3xx. Examples: ``"200"`` , ``"! 500"`` , ``"301-303 307"``. See the documentation of the [match](https://nginx.org/en/docs/http/ngx_http_upstream_hc_module.html?#match) directive. This not supported for gRPC type upstreams. | ``string`` | No |
|``grpcStatus`` | The expected [gRPC status code](https://github.com/grpc/grpc/blob/master/doc/statuscodes.md#status-codes-and-their-use-in-grpc) of the upstream server response to the [Check method](https://github.com/grpc/grpc/blob/master/doc/health-checking.md). Configure this field only if your gRPC services do not implement the gRPC health checking protocol. For example, configure ``12`` if the upstream server responds with `12 (UNIMPLEMENTED)` status code. Only valid on gRPC type upstreams. | ``int`` | No |
|``grpcService`` | The gRPC service to be monitored on the upstream server. Only valid on gRPC type upstreams. | ``string`` | No |
|``mandatory`` | Require every newly added server to pass all configured health checks before NGINX Plus sends traffic to it. If this is not specified, or is set to false, the server will be initially considered healthy. When combined with [slow-start](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#slow_start), it gives a new server more time to connect to databases and “warm up” before being asked to handle their full share of traffic. | ``bool`` | No |
|``persistent`` | Set the initial “up” state for a server after reload if the server was considered healthy before reload. Enabling persistent requires that the mandatory parameter is also set to `true`. | ``bool`` | No |
|``keepalive-time`` | Enables [keepalive](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive) connections for health checks and specifies the time during which requests can be processed through one keepalive connection. The default is ``60s``. | ``string`` | No |

### Upstream.SessionCookie

The SessionCookie field configures session persistence which allows requests from the same client to be passed to the same upstream server. The information about the designated upstream server is passed in a session cookie generated by NGINX.

In the example below, we configure session persistence with a session cookie for an upstream and configure all the available parameters:

```yaml
name: tea
service: tea-svc
port: 80
sessionCookie:
  enable: true
  name: srv_id
  path: /
  expires: 1h
  domain: .example.com
  httpOnly: false
  secure: true
  samesite: strict
```

See the [`sticky`](https://nginx.org/en/docs/http/ngx_http_upstream_module.html?#sticky) directive for additional information. The session cookie corresponds to the `sticky cookie` method.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``enable`` | Enables session persistence with a session cookie for an upstream server. The default is ``false``. | ``boolean`` | No |
|``name`` | The name of the cookie. | ``string`` | Yes |
|``path`` | The path for which the cookie is set. | ``string`` | No |
|``expires`` | The time for which a browser should keep the cookie. Can be set to the special value ``max`` , which will cause the cookie to expire on ``31 Dec 2037 23:55:55 GMT``. | ``string`` | No |
|``domain`` | The domain for which the cookie is set. | ``string`` | No |
|``httpOnly`` | Adds the ``HttpOnly`` attribute to the cookie. | ``boolean`` | No |
|``secure`` | Adds the ``Secure`` attribute to the cookie. | ``boolean`` | No |
|``samesite`` | Adds the ``SameSite`` attribute to the cookie. The allowed values are: ``strict``, ``lax``, ``none`` | ``string`` | No |

### Action

The action defines an action to perform for a request.

In the example below, client requests are passed to an upstream `coffee`:

```yaml
 path: /coffee
 action:
  pass: coffee
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``pass`` | Passes requests to an upstream. The upstream with that name must be defined in the resource. | ``string`` | No |
|``redirect`` | Redirects requests to a provided URL. | [action.redirect](#actionredirect) | No |
|``return`` | Returns a preconfigured response. | [action.return](#actionreturn) | No |
|``proxy`` | Passes requests to an upstream with the ability to modify the request/response (for example, rewrite the URI or modify the headers). | [action.proxy](#actionproxy) | No |

\* -- an action must include exactly one of the following: `pass`, `redirect`, `return` or `proxy`.

### Action.Redirect

The redirect action defines a redirect to return for a request.

In the example below, client requests are passed to a url `http://www.nginx.com`:

```yaml
redirect:
  url: http://www.nginx.com
  code: 301
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``url`` | The URL to redirect the request to. Supported NGINX variables: ``$scheme`` , ``$http_x_forwarded_proto`` , ``$request_uri`` , ``$host``. Variables must be enclosed in curly braces. For example: ``${host}${request_uri}``. | ``string`` | Yes |
|``code`` | The status code of a redirect. The allowed values are: ``301`` , ``302`` , ``307`` , ``308``. The default is ``301``. | ``int`` | No |

### Action.Return

The return action defines a preconfigured response for a request.

In the example below, NGINX will respond with the preconfigured response for every request:

```yaml
return:
  code: 200
  type: text/plain
  body: "Hello World\n"
  headers:
  - name: x-coffee
    value: espresso
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``code`` | The status code of the response. The allowed values are: ``2XX``, ``4XX`` or ``5XX``. The default is ``200``. | ``int`` | No |
|``type`` | The MIME type of the response. The default is ``text/plain``. | ``string`` | No |
|``body`` | The body of the response. Supports NGINX variables*. Variables must be enclosed in curly brackets. For example: ``Request is ${request_uri}\n``. | ``string`` | Yes |
|``headers`` | The custom headers of the response. | [[]Action.Return.Header](#actionreturnheader) | No |

\* -- Supported NGINX variables: `$request_uri`, `$request_method`, `$request_body`, `$scheme`, `$http_`, `$args`, `$arg_`, `$cookie_`, `$host`, `$request_time`, `$request_length`, `$nginx_version`, `$pid`, `$connection`, `$remote_addr`, `$remote_port`, `$time_iso8601`, `$time_local`, `$server_addr`, `$server_port`, `$server_name`, `$server_protocol`, `$connections_active`, `$connections_reading`, `$connections_writing` and `$connections_waiting`.

### Action.Return.Header

The header defines an HTTP Header for a canned response in an actionReturn:

```yaml
name: x-coffee
value: espresso
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the header. | ``string`` | Yes |
|``value`` | The value of the header. | ``string`` | Yes |

### Action.Proxy

The proxy action passes requests to an upstream with the ability to modify the request/response (for example, rewrite the URI or modify the headers).

In the example below, the request URI is rewritten to `/`, and the request and the response headers are modified:

```yaml
proxy:
  upstream: coffee
  requestHeaders:
    pass: true
    set:
    - name: My-Header
      value: Value
    - name: Client-Cert
      value: ${ssl_client_escaped_cert}
  responseHeaders:
    add:
    - name: My-Header
      value: Value
    - name: IC-Nginx-Version
      value: ${nginx_version}
      always: true
    hide:
    - x-internal-version
    ignore:
    - Expires
    - Set-Cookie
    pass:
    - Server
  rewritePath: /
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``upstream`` | The name of the upstream which the requests will be proxied to. The upstream with that name must be defined in the resource. | ``string`` | Yes |
|``requestHeaders`` | The request headers modifications. | [action.Proxy.RequestHeaders](#actionproxyrequestheaders) | No |
|``responseHeaders`` | The response headers modifications. | [action.Proxy.ResponseHeaders](#actionproxyresponseheaders) | No |
|``rewritePath`` | The rewritten URI. If the route path is a regular expression -- starts with `~` -- the `rewritePath` can include capture groups with ``$1-9``. For example `$1` for the first group, and so on. For more information, check the [rewrite](https://github.com/nginx/kubernetes-ingress/tree/v/examples/custom-resources/rewrites) example. | ``string`` | No |

### Action.Proxy.RequestHeaders

The RequestHeaders field modifies the headers of the request to the proxied upstream server.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``pass`` | Passes the original request headers to the proxied upstream server. See the [proxy_pass_request_header](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass_request_headers) directive for more information. Default is true. | ``bool`` | No |
|``set`` | Allows redefining or appending fields to present request headers passed to the proxied upstream servers. See the [proxy_set_header](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_set_header) directive for more information. | [[]header](#actionproxyrequestheaderssetheader) | No |

### Action.Proxy.RequestHeaders.Set.Header

The header defines an HTTP Header:

```yaml
name: My-Header
value: My-Value
```

It is possible to override the default value of the `Host` header, which NGINX Ingress Controller LTS sets to [`$host`](https://nginx.org/en/docs/http/ngx_http_core_module.html#var_host):

```yaml
name: Host
value: example.com
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the header. | ``string`` | Yes |
|``value`` | The value of the header. Supports NGINX variables*. Variables must be enclosed in curly brackets. For example: ``${scheme}``. | ``string`` | No |

\* -- Supported NGINX variables: `$request_uri`, `$request_method`, `$request_body`, `$scheme`, `$http_`, `$args`, `$arg_`, `$cookie_`, `$host`, `$request_time`, `$request_length`, `$nginx_version`, `$pid`, `$connection`, `$remote_addr`, `$remote_port`, `$time_iso8601`, `$time_local`, `$server_addr`, `$server_port`, `$server_name`, `$server_protocol`, `$connections_active`, `$connections_reading`, `$connections_writing`, `$connections_waiting`, `$ssl_cipher`, `$ssl_ciphers`, `$ssl_client_cert`, `$ssl_client_escaped_cert`, `$ssl_client_fingerprint`, `$ssl_client_i_dn`, `$ssl_client_i_dn_legacy`, `$ssl_client_raw_cert`, `$ssl_client_s_dn`, `$ssl_client_s_dn_legacy`, `$ssl_client_serial`, `$ssl_client_v_end`, `$ssl_client_v_remain`, `$ssl_client_v_start`, `$ssl_client_verify`, `$ssl_curves`, `$ssl_early_data`, `$ssl_protocol`, `$ssl_server_name`, `$ssl_session_id`, `$ssl_session_reused`, `$jwt_claim_`  and `$jwt_header_`.

### Action.Proxy.ResponseHeaders

The ResponseHeaders field modifies the headers of the response to the client.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``hide`` | The headers that will not be passed* in the response to the client from a proxied upstream server. See the [proxy_hide_header](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_hide_header) directive for more information. | ``[]string`` | No |
|``pass`` | Allows passing the hidden header fields* to the client from a proxied upstream server. See the [proxy_pass_header](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass_header) directive for more information. | ``[]string`` | No |
|``ignore`` | Disables processing of certain headers** to the client from a proxied upstream server. See the [proxy_ignore_headers](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_ignore_headers) directive for more information. | ``[]string`` | No |
|``add`` | Adds headers to the response to the client. | [[]addHeader](#addheader) | No |

\* -- Default hidden headers are: `Date`, `Server`, `X-Pad` and `X-Accel-...`.

\** -- The following fields can be ignored: `X-Accel-Redirect`, `X-Accel-Expires`, `X-Accel-Limit-Rate`, `X-Accel-Buffering`, `X-Accel-Charset`, `Expires`, `Cache-Control`, `Set-Cookie` and `Vary`.

### AddHeader

The addHeader defines an HTTP Header with an optional `always` field:

```yaml
name: My-Header
value: My-Value
always: true
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the header. | ``string`` | Yes |
|``value`` | The value of the header. Supports NGINX variables*. Variables must be enclosed in curly brackets. For example: ``${scheme}``. | ``string`` | No |
|``always`` | If set to true, add the header regardless of the response status code**. Default is false. See the [add_header](http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header) directive for more information. | ``bool`` | No |

\* -- Supported NGINX variables: `$request_uri`, `$request_method`, `$request_body`, `$scheme`, `$http_`, `$args`, `$arg_`, `$cookie_`, `$host`, `$request_time`, `$request_length`, `$nginx_version`, `$pid`, `$connection`, `$remote_addr`, `$remote_port`, `$time_iso8601`, `$time_local`, `$server_addr`, `$server_port`, `$server_name`, `$server_protocol`, `$connections_active`, `$connections_reading`, `$connections_writing`, `$connections_waiting`, `$ssl_cipher`, `$ssl_ciphers`, `$ssl_client_cert`, `$ssl_client_escaped_cert`, `$ssl_client_fingerprint`, `$ssl_client_i_dn`, `$ssl_client_i_dn_legacy`, `$ssl_client_raw_cert`, `$ssl_client_s_dn`, `$ssl_client_s_dn_legacy`, `$ssl_client_serial`, `$ssl_client_v_end`, `$ssl_client_v_remain`, `$ssl_client_v_start`, `$ssl_client_verify`, `$ssl_curves`, `$ssl_early_data`, `$ssl_protocol`, `$ssl_server_name`, `$ssl_session_id`, `$ssl_session_reused`, `$jwt_claim_` and `$jwt_header_`.

**note:**  If `always` is false, the response header is added only if the response status code is any of `200`, `201`, `204`, `206`, `301`, `302`, `303`, `304`, `307` or `308`. 

### Split

The split defines a weight for an action as part of the splits configuration.

In the example below NGINX passes 80% of requests to the upstream `coffee-v1` and the remaining 20% to `coffee-v2`:

```yaml
splits:
- weight: 80
  action:
    pass: coffee-v1
- weight: 20
  action:
    pass: coffee-v2
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``weight`` | The weight of an action. Must fall into the range ``0..100``. The sum of the weights of all splits must be equal to ``100``. | ``int`` | Yes |
|``action`` | The action to perform for a request. | [action](#action) | Yes |

### Match

The match defines a match between conditions and an action or splits.

In the example below, NGINX routes requests with the path `/coffee` to different upstreams based on the value of the cookie `user`:

- `user=john` -> `coffee-future`
- `user=bob` -> `coffee-deprecated`
- If the cookie is not set or not equal to either `john` or `bob`, NGINX routes to `coffee-stable`

```yaml
path: /coffee
matches:
- conditions:
  - cookie: user
    value: john
  action:
    pass: coffee-future
- conditions:
  - cookie: user
    value: bob
  action:
    pass: coffee-deprecated
action:
  pass: coffee-stable
```

In the next example, NGINX routes requests based on the value of the built-in [`$request_method` variable](https://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_method), which represents the HTTP method of a request:

- all POST requests -> `coffee-post`
- all non-POST requests -> `coffee`

```yaml
path: /coffee
matches:
- conditions:
  - variable: $request_method
    value: POST
  action:
    pass: coffee-post
action:
  pass: coffee
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``conditions`` | A list of conditions. Must include at least 1 condition. | [[]condition](#condition) | Yes |
|``action`` | The action to perform for a request. | [action](#action) | No |
|``splits`` | The splits configuration for traffic splitting. Must include at least 2 splits. | [[]split](#split) | No |

**note:**  A match must include exactly one of the following: `action` or `splits`. 

### Condition

The condition defines a condition in a match.

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``header`` | The name of a header. Must consist of alphanumeric characters or ``-``. | ``string`` | No |
|``cookie`` | The name of a cookie. Must consist of alphanumeric characters or ``_``. | ``string`` | No |
|``argument`` | The name of an argument. Must consist of alphanumeric characters or ``_``. | ``string`` | No |
|``variable`` | The name of an NGINX variable. Must start with ``$``. See the list of the supported variables below the table. | ``string`` | No |
|``value`` | The value to match the condition against. How to define a value is shown below the table. | ``string`` | Yes |

**note:**   a condition must include exactly one of the following: `header`, `cookie`, `argument` or `variable`. 

Supported NGINX variables: `$args`, `$http2`, `$https`, `$remote_addr`, `$remote_port`, `$query_string`, `$request`, `$request_body`, `$request_uri`, `$request_method`, `$scheme`. Find the documentation for each variable [here](https://nginx.org/en/docs/varindex.html).

The value supports two kinds of matching:

- *Case-insensitive string comparison*. For example:
  - `john` -- case-insensitive matching that succeeds for strings, such as `john`, `John`, `JOHN`.
  - `!john` -- negation of the case-insensitive matching for john that succeeds for strings, such as `bob`, `anything`, `''` (empty string).
- *Matching with a regular expression*. Note that NGINX supports regular expressions compatible with those used by the Perl programming language (PCRE). For example:
  - `~^yes` -- a case-sensitive regular expression that matches any string that starts with `yes`. For example: `yes`, `yes123`.
  - `!~^yes` -- negation of the previous regular expression that succeeds for strings like `YES`, `Yes123`, `noyes`. (The negation mechanism is not part of the PCRE syntax).
  - `~*no$` -- a case-insensitive regular expression that matches any string that ends with `no`. For example: `no`, `123no`, `123NO`.

**note:**  A value must not include any unescaped double quotes (`"`) and must not end with an unescaped backslash (`\`). For example, the following are invalid values: `some"value`, `somevalue\`. 

### ErrorPage

The errorPage defines a custom response for a route for the case when either an upstream server responds with (or NGINX generates) an error status code. The custom response can be a redirect or a canned response. See the [error_page](https://nginx.org/en/docs/http/ngx_http_core_module.html#error_page) directive for more information.

```yaml
path: /coffee
errorPages:
- codes: [502, 503]
  redirect:
    code: 301
    url: https://nginx.org
- codes: [404]
  return:
    code: 200
    body: "Original resource not found, but success!"
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``codes`` | A list of error status codes. | ``[]int`` | Yes |
|``redirect`` | The redirect action for the given status codes. | [errorPage.Redirect](#errorpageredirect) | No |
|``return`` | The canned response action for the given status codes. | [errorPage.Return](#errorpagereturn) | No |

**note:**  An errorPage must include exactly one of the following: `return` or `redirect`. 

### ErrorPage.Redirect

The redirect defines a redirect for an errorPage.

In the example below, NGINX responds with a redirect when a response from an upstream server has a 404 status code.

```yaml
codes: [404]
redirect:
  code: 301
  url: ${scheme}://cafe.example.com/error.html
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``code`` | The status code of a redirect. The allowed values are: ``301`` , ``302`` , ``307`` , ``308``.  The default is ``301``. | ``int`` | No |
|``url`` | The URL to redirect the request to. Supported NGINX variables: ``$scheme`` and ``$http_x_forwarded_proto``. Variables must be enclosed in curly braces. For example: ``${scheme}``. | ``string`` | Yes |

### ErrorPage.Return

The return defines a canned response for an errorPage.

In the example below, NGINX responds with a canned response when a response from an upstream server has either 401 or 403 status code.

```yaml
codes: [401, 403]
return:
  code: 200
  type: application/json
  body: |
    {\"msg\": \"You don't have permission to do this\"}
  headers:
  - name: x-debug-original-statuses
    value: ${upstream_status}
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``code`` | The status code of the response. The default is the status code of the original response. | ``int`` | No |
|``type`` | The MIME type of the response. The default is ``text/html``. | ``string`` | No |
|``body`` | The body of the response. Supported NGINX variable: ``$upstream_status`` . Variables must be enclosed in curly braces. For example: ``${upstream_status}``. | ``string`` | Yes |
|``headers`` | The custom headers of the response. | [[]errorPage.Return.Header](#errorpagereturnheader) | No |

### ErrorPage.Return.Header

The header defines an HTTP Header for a canned response in an errorPage:

```yaml
name: x-debug-original-statuses
value: ${upstream_status}
```

|Field | Description | Type | Required |
| ---| ---| ---| --- |
|``name`` | The name of the header. | ``string`` | Yes |
|``value`` | The value of the header. Supported NGINX variable: ``$upstream_status`` . Variables must be enclosed in curly braces. For example: ``${upstream_status}``. | ``string`` | No |

## Using VirtualServer and VirtualServerRoute

You can use the usual `kubectl` commands to work with VirtualServer and VirtualServerRoute resources, similar to Ingress resources.

For example, the following command creates a VirtualServer resource defined in `cafe-virtual-server.yaml` with the name `cafe`:

```shell
kubectl apply -f cafe-virtual-server.yaml
```

```text
virtualserver.k8s.nginx.org "cafe" created
```

You can get the resource by running:

```shell
kubectl get virtualserver cafe
```

```text
NAME   STATE   HOST                   IP            PORTS      AGE
cafe   Valid   cafe.example.com       12.13.23.123  [80,443]   3m
```

In `kubectl get` and similar commands, you can use the short name `vs` instead of `virtualserver`.

Similarly, for VirtualServerRoute you can use `virtualserverroute` or the short name `vsr`.

### Using Snippets

Snippets allow you to insert raw NGINX config into different contexts of NGINX configuration. In the example below, we use snippets to configure several NGINX features in a VirtualServer:

```yaml
apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
  namespace: cafe
spec:
  http-snippets: |
    limit_req_zone $binary_remote_addr zone=mylimit:10m rate=1r/s;
    proxy_cache_path /tmp keys_zone=one:10m;
  host: cafe.example.com
  tls:
    secret: cafe-secret
  server-snippets: |
    limit_req zone=mylimit burst=20;
  upstreams:
  - name: tea
    service: tea-svc
    port: 80
  - name: coffee
    service: coffee-svc
    port: 80
  routes:
  - path: /tea
    location-snippets: |
      proxy_cache one;
      proxy_cache_valid 200 10m;
    action:
      pass: tea
  - path: /coffee
    action:
      pass: coffee
```

For additional information, view the [Advanced configuration with Snippets](/nic/lts/configuration/ingress-resources/advanced-configuration-with-snippets.md) topic.

### Validation

Two types of validation are available for VirtualServer and VirtualServerRoute resources:

- *Structural validation* by the `kubectl` and Kubernetes API server.
- *Comprehensive validation* by NGINX Ingress Controller LTS.

#### Structural Validation

The custom resource definitions for VirtualServer and VirtualServerRoute include structural OpenAPI schema which describes the type of every field of those resources.

If you try to create (or update) a resource that violates the structural schema (for example, you use a string value for the port field of an upstream), `kubectl` and Kubernetes API server will reject such a resource:

- Example of `kubectl` validation:

    ```shell
    kubectl apply -f cafe-virtual-server.yaml
    ```
    
    ```text
    error: error validating "cafe-virtual-server.yaml": error validating data: ValidationError(VirtualServer.spec.upstreams[0].port): invalid type for org.nginx.k8s.v1.VirtualServer.spec.upstreams.port: got "string", expected "integer"; if you choose to ignore these errors, turn validation off with --validate=false
    ```

- Example of Kubernetes API server validation:

    ```shell
    kubectl apply -f cafe-virtual-server.yaml --validate=false
    ```

    ```text
    The VirtualServer "cafe" is invalid: []: Invalid value: map[string]interface {}{ ... }: validation failure list:
    spec.upstreams.port in body must be of type integer: "string"
    ```

If a resource is not rejected (it doesn't violate the structural schema), NGINX Ingress Controller LTS will validate it further.

#### Comprehensive Validation

NGINX Ingress Controller LTS validates the fields of the VirtualServer and VirtualServerRoute resources. If a resource is invalid, NGINX Ingress Controller LTS will reject it: the resource will continue to exist in the cluster, but NGINX Ingress Controller LTS will ignore it.

You can check if NGINX Ingress Controller LTS successfully applied the configuration for a VirtualServer. For our example `cafe` VirtualServer, we can run:

```shell
kubectl describe vs cafe
```

```text
...
Events:
  Type    Reason          Age   From                      Message
  ----    ------          ----  ----                      -------
  Normal  AddedOrUpdated  16s   nginx-ingress-controller  Configuration for default/cafe was added or updated
```

Note how the events section includes a Normal event with the AddedOrUpdated reason that informs us that the configuration was successfully applied.

If you create an invalid resource, NGINX Ingress Controller LTS will reject it and emit a Rejected event. For example, if you create a VirtualServer `cafe` with two upstream with the same name `tea`, you will get:

```shell
kubectl describe vs cafe
```

```text
...
Events:
  Type     Reason    Age   From                      Message
  ----     ------    ----  ----                      -------
  Warning  Rejected  12s   nginx-ingress-controller  VirtualServer default/cafe is invalid and was rejected: spec.upstreams[1].name: Duplicate value: "tea"
```

Note how the events section includes a Warning event with the Rejected reason.

Additionally, this information is also available in the `status` field of the VirtualServer resource. Note the Status section of the VirtualServer:

```shell
kubectl describe vs cafe
```

```text
...
Status:
  External Endpoints:
    Ip:        12.13.23.123
    Ports:     [80,443]
  Message:  VirtualServer default/cafe is invalid and was rejected: spec.upstreams[1].name: Duplicate value: "tea"
  Reason:   Rejected
  State:    Invalid
```

NGINX Ingress Controller LTS validates VirtualServerRoute resources in a similar way.

**Note**: If you make an existing resource invalid, NGINX Ingress Controller LTS will reject it and remove the corresponding configuration from NGINX.

## Customization using ConfigMap

You can customize the NGINX configuration for VirtualServer and VirtualServerRoutes resources using the [ConfigMap](/nic/lts/configuration/global-configuration/configmap-resource.md). Most of the ConfigMap keys are supported, with the following exceptions:

- `proxy-hide-headers`
- `proxy-pass-headers`
- `hsts`
- `hsts-max-age`
- `hsts-include-subdomains`
- `hsts-behind-proxy`
- `redirect-to-https`
- `ssl-redirect`
- `http-redirect-code`