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GRPCRoute resource configuration reference

This page provides reference information for the GRPCRoute resource, which defines L7 gRPC traffic within the service mesh.

This custom resource definition (CRD) describes a resource related to the Kubernetes GAMMA initiative that requires the v2 catalog API. It is not compatible with the v1 catalog API. For more information about GAMMA resources, refer to the Kubernetes Gateway API documentation.

Configuration model

The following list outlines field hierarchy, language-specific data types, and requirements in a gRPC route CRD. Click on a property name to view additional details, including default values.

Complete configuration

When every field is defined, a gRPC route resource CRD has the following form:

apiVersion: mesh.consul.hashicorp.com/v2beta1        # required 
kind: GRPCRoute                                      # required
metadata:
  name: <CRDName>
  namespace: <namespace>
spec:
  parentRefs:
    port: <portNameRoutedFrom>
    - ref:
      name: <nameRoutedFrom>
      type: 
        group: <catalog>
        groupVersion: <v2beta1>
        kind: <Service>
  rules:
    - backendRefs:
      - backendRef:
        datacenter: <datacenterRoutedTo>
        port: "<portNameRoutedTo>"
        ref:
          name: <nameRoutedTo>
          type:
            group: <catalog>
            groupVersion: <v2beta1>
            kind: <Service>
      filters:
        - requestHeaderModifier:
          add:
            name: <headerName>
            value: <headerValue>
        - responseHeaderModifier:
          set:
            name: <headerName>
            value: <headerValue>
        urlRewrite:
          pathPrefix: <path/prefix>
      weight: 1
    filters:
      requestHeaderModifier:
          remove:
            name: <headerName>
            value: <headerValue>
      responseHeaderModifier:      
          add:
            name: <headerName>
            value: <headerValue>
      urlRewrite:
        pathPrefix: <path/prefix>
    matches:
      headers:
        name: <nameToMatch>
        type: <typeToMatch>
        value: <valueToMatch>
      method:
        method: <methodToMatch>
        service: <serviceToMatch>
        type: <typeToMatch>
    retries:
      number:
        value: 1
      onConditions: ["cancelled", "unavailable"]
      onConnectFailure: false
      onStatusCodes: [400, 404]
    timeouts:
      idle: <1s>
      request: <1s>

Specification

This section provides details about the fields you can configure in the GRPCRoute custom resource definition (CRD).

apiVersion

Specifies the version of the Consul API for integrating with Kubernetes. The value must be mesh.consul.hashicorp.com/v2beta1.

Values

  • Default: None
  • This field is required.
  • String value that must be set to mesh.consul.hashicorp.com/v2beta1.

kind

Specifies the type of CRD to implement. Must be set to GRPCRoute.

Values

  • Default: None
  • This field is required.
  • Data type: String value that must be set to GRPCRoute.

metadata

Map that contains an arbitrary name for the CRD and the namespace it applies to.

Values

  • Default: None
  • Data type: Map

metadata.name

Specifies a name for the CRD. The name is metadata that you can use to reference the resource when performing Consul operations, such as using the consul resource command. Refer to consul resource for more information.

Values

  • Default: None
  • This field is required.
  • Data type: String

metadata.namespace Enterprise

Specifies the namespace that the service resolver applies to. Refer to namespaces for more information.

Values

  • Default: None
  • Data type: String

spec

Map that contains the details about the GRPCRoute CRD. The apiVersion, kind, and metadata fields are siblings of the spec field. All other configurations are children.

When using this CRD, the spec field closely resembles the GRPCRoute GAMMA resource. Refer to GRPCRoute in the Kubernetes documentation.

Values

  • Default: None
  • This field is required.
  • Data type: Map

spec.parentRefs

Specifies the services and other resources to attach the route to. You can only define one parentsRefs configuration for each route. To attach the route to multiple resources, specify additional spec.parentRefs.ref configurations in the parentsRefs block. You can only specify the name of one port for the route. Any resources that send traffic through the route use the same port.

Values

  • Default: None
  • This field is required.
  • Data type: Map

spec.parentRefs.port

Specifies the name of the port that the configuration applies to.

Values

  • Default: None
  • Data type: String

spec.parentRefs.ref

Specifies the resource that the route attaches to.

Values

  • Default: None
  • Data type: Map

spec.parentRefs.ref.name

Specifies the user-defined name of the resource that the configuration applies to.

Values

  • Default: None
  • Data type: String

spec.parentRefs.ref.type

Specifies the type of resource that the configuration applies to. To reference a service in the Consul catalog, configure the resource type as catalog.v2beta1.Service.

Values

  • Default: None

  • Data type: Map containing the following parameters:

    ParameterDescriptionData typeDefault
    groupSpecifies a group for the resource type within the Kubernetes cluster. To reference a service in the Consul catalog, set this parameter to catalog.StringNone
    groupVersionSpecifies a groupVersion for the resource type within the Kubenretes cluster. To reference a service in the Consul catalog, set this parameter to v2beta1.StringNone
    kindSpecifies the kind of the Kubernetes object the resource applies to. To reference a service in the Consul catalog, set this parameter to Service.StringNone

spec.rules

Specifies rules for sidecar proxies to direct a service's gRPC traffic within the service mesh, including filtering, retry, and timeout behavior.

Values

  • Default: None
  • Data type: Map

spec.rules.backendRefs

Specifies the Kubernetes Service backend to direct GRPC traffic to when a request matches the service described in spec.parentRefs. The Service backend is the collection of endpoint IPs for the service. Refer to the Kubernetes Gateway API specification for more information about Service backends.

When a valid Service backend cannot be reached and no additional filters apply, traffic that matches the rule returns a 500 status code.

When different Service backends are specified in spec.rules.backendRefs.weight and one of the backends is invalid, Consul continues to apply the specified weights instead of adjusting the relative weights to exclude traffic to the invalid backend. For example, when traffic is configured in a 50-50 split between api and admin and no valid endpoints for admin can be reached, the 50% of traffic intended for admin returns with a 500 status code.

Values

  • Default: None
  • Data type: Map

spec.rules.backendRefs.backendRef

Specifies an individual Service backend where matching requests should be sent.

Values

  • Default: None
  • Data type: Map

spec.rules.backendRefs.backendRef.datacenter

Specifies the name of the Consul datacenter that registered the Service backend that the configuration routes traffic to.

Values

  • Default: None
  • Data type: String

spec.rules.backendRefs.backendRef.port

Specifies the name of the port for the Consul service that the configuration routes traffic to.

Values

  • Default: None
  • Data type: String

spec.rules.backendRefs.backendRef.ref

The Consul service that the configuration routes traffic to.

Values

  • Default: None
  • Data type: Map

spec.rules.backendRefs.backendRef.ref.name

Specifies the user-defined name of the resource that the configuration routes traffic to.

Values

  • Default: None
  • Data type: String

spec.rules.backendRefs.backendRef.ref.type

Specifies the type of resource that the configuration routes traffic to. To reference a service in the Consul catalog, configure the resource type as catalog.v2beta1.Service.

Values

  • Default: None

  • Data type: Map containing the following parameters:

    ParameterDescriptionData typeDefault
    groupSpecifies a group for the resource type within the Kubernetes cluster. To reference a service in the Consul catalog, set this parameter to catalog.StringNone
    groupVersionSpecifies a groupVersion for the resource type within the Kubenretes cluster. To reference a service in the Consul catalog, set this parameter to v2beta1.StringNone
    kindSpecifies the kind of the Kubernetes object for the resource. To reference a service in the Consul catalog, set this parameter to Service.StringNone

spec.rules.backendRefs.filters

Specifies filtering behavior for services configured in the same spec.rules.backendRefs block.

Values

  • Default: None
  • Data type: Map

spec.rules.backendRefs.filters.requestHeaderModifier

Specifies a set of header modification rules applied to requests routed with the gRPC route resource.

Values

  • Default: None
  • Values: Object containing one or more fields that define header modification rules:
    • add: Map of one or more key-value pairs.
    • set: Map of one or more key-value pairs.
    • remove: Map of one or more key-value pairs.

The following table describes how to configure values for request headers:

RuleDescriptionType
addDefines a set of key-value pairs to add to the header. Use header names as the keys. Header names are not case-sensitive. If header values with the same name already exist, the value is appended and Consul applies both headers. You can use variable placeholders.Map of strings
setDefines a set of key-value pairs to add to the request header or to replace existing header values with. Use header names as the keys. Header names are not case-sensitive. If header values with the same names already exist, Consul replaces the header values. You can use variable placeholders.Map of strings
removeDefines a list of headers to remove. Consul removes only headers containing exact matches. Header names are not case-sensitive.List of strings
Use variable placeholders

For add and set, if the service is configured to use Envoy as the proxy, the value may contain variables to interpolate dynamic metadata into the value. For example, using the variable %DOWNSTREAM_REMOTE_ADDRESS% allows you to pass a value that is generated when the split occurs.

spec.rules.backendRefs.filters.responseHeaderModifier

Specifies a set of header modification rules applied to responses routed with the gRPC route resource.

Values

  • Default: None
  • Values: Object containing one or more fields that define header modification rules:
    • add: Map of one or more key-value pairs.
    • set: Map of one or more key-value pairs.
    • remove: Map of one or more key-value pairs.

The following table describes how to configure values for request headers:

RuleDescriptionType
addDefines a set of key-value pairs to add to the header. Use header names as the keys. Header names are not case-sensitive. If header values with the same name already exist, the value is appended and Consul applies both headers. You can use variable placeholders.Map of strings
setDefines a set of key-value pairs to add to the request header or to replace existing header values with. Use header names as the keys. Header names are not case-sensitive. If header values with the same names already exist, Consul replaces the header values. You can use variable placeholders.Map of strings
removeDefines a list of headers to remove. Consul removes only headers containing exact matches. Header names are not case-sensitive.List of strings
Use variable placeholders

For add and set, if the service is configured to use Envoy as the proxy, the value may contain variables to interpolate dynamic metadata into the value. For example, using the variable %DOWNSTREAM_REMOTE_ADDRESS% allows you to pass a value that is generated when the split occurs.

spec.rules.backendRefs.filters.urlRewrite

Specifies a path to modify the URL with when a request is forwarded.

Values

  • Default: None

  • Data type: Map containing the following parameter:

    ParameterDescriptionData typeDefault
    pathPrefixSpecifies the path that is prepended to the URL.StringNone

spec.rules.backendRefs.weight

Specifies the proportion of requests routed to the specified service.

This proportion is relative to the sum of all weights in the spec.rules.backendRefs block. As a result, weights do not need to add up to 100. When only one backend is specified and the weight is greater then 0, Consul forwards 100% of traffic to the backend.

When this parameter is not specified, Consul defaults to 1.

Values

  • Default: 1
  • Data type: Integer

spec.rules.filters

Specifies filtering behavior for all requests that match the service defined in spec.parentRefs.

Values

  • Default: None
  • Data type: Map

spec.rules.filters.requestHeaderModifier

Specifies a set of header modification rules applied to requests that match the service defined in spec.parentRefs.

Values

  • Default: None
  • Values: Object containing one or more fields that define header modification rules:
    • add: Map of one or more key-value pairs.
    • set: Map of one or more key-value pairs.
    • remove: Map of one or more key-value pairs.

The following table describes how to configure values for request headers:

RuleDescriptionType
addDefines a set of key-value pairs to add to the header. Use header names as the keys. Header names are not case-sensitive. If header values with the same name already exist, the value is appended and Consul applies both headers. You can use variable placeholders.Map of strings
setDefines a set of key-value pairs to add to the request header or to replace existing header values with. Use header names as the keys. Header names are not case-sensitive. If header values with the same names already exist, Consul replaces the header values. You can use variable placeholders.Map of strings
removeDefines a list of headers to remove. Consul removes only headers containing exact matches. Header names are not case-sensitive.List of strings
Use variable placeholders

For add and set, if the service is configured to use Envoy as the proxy, the value may contain variables to interpolate dynamic metadata into the value. For example, using the variable %DOWNSTREAM_REMOTE_ADDRESS% allows you to pass a value that is generated when the split occurs.

spec.rules.filters.responseHeaderModifier

Specifies a set of header modification rules applied to responses from services matching spec.parentRefs.

Values

  • Default: None
  • Values: Object containing one or more fields that define header modification rules:
    • add: Map of one or more key-value pairs.
    • set: Map of one or more key-value pairs.
    • remove: Map of one or more key-value pairs.

The following table describes how to configure values for request headers:

RuleDescriptionType
addDefines a set of key-value pairs to add to the header. Use header names as the keys. Header names are not case-sensitive. If header values with the same name already exist, the value is appended and Consul applies both headers. You can use variable placeholders.Map of strings
setDefines a set of key-value pairs to add to the request header or to replace existing header values with. Use header names as the keys. Header names are not case-sensitive. If header values with the same names already exist, Consul replaces the header values. You can use variable placeholders.Map of strings
removeDefines a list of headers to remove. Consul removes only headers containing exact matches. Header names are not case-sensitive.List of strings
Use variable placeholders

For add and set, if the service is configured to use Envoy as the proxy, the value may contain variables to interpolate dynamic metadata into the value. For example, using the variable %DOWNSTREAM_REMOTE_ADDRESS% allows you to pass a value that is generated when the split occurs.

spec.rules.filters.urlRewrite

Specifies a path to modify the URL with when a request matching spec.parentRefs is forwarded.

Values

  • Default: None

  • Data type: Map containing the following parameter:

    ParameterDescriptionData typeDefault
    pathPrefixSpecifies a path to prepend to the URL when a request matching spec.parentRefs is forwarded.StringNone

spec.rules.matches

Specifies rules for matching traffic to services described in spec.parentRefs according to the request header or method.

Values

  • Default: None
  • Data type: Map

spec.rules.matches.headers

Specifies criteria for matching gRPC request headers.

When [spec.rules.matches.headers.value] is specified multiple times, a request must match all of the specified values for the route to be selected.

Values

  • Default: None
  • Data type: Map

spec.rules.matches.headers.name

Specifies the name of a gRPC request header to match on.

Values

  • Default: None
  • Data type: String

spec.rules.matches.headers.type

Specifies a type of match to perform on the gRPC request header. Supported match types include: unspecified, exact, regex, present, prefix, and suffix.

Values

spec.rules.matches.headers.value

Specifies the value of the gRPC request header to match. When this field is specified multiple times, a request must match all of the specified values for the route to be selected.

Values

  • Default: None
  • Data type: String

spec.rules.matches.method

Specifies criteria for matching a service and a gRPC request method. When configuring this field, either spec.rules.matches.method.method or spec.rules.matches.method.service must be a non-empty string.

Values

  • Default: None
  • Data type: Map

spec.rules.matches.method.method

Specifies the value of the method to match. When empty or omitted, all methods match.

Values

  • Default: None
  • Data type: String

spec.rules.matches.method.service

Specifies the value of the service to match. When empty or omitted, all services match.

Values

  • Default: None
  • Data type: String

spec.rules.matches.method.type

Specifies a type of match to perform on the gRPC request method. Supported match types include: unspecified, exact, and regex.

Values

spec.rules.retries

Specifies retry logic for routing gRPC traffic.

Values

  • Default: None
  • Data type: Map

spec.rules.retries.number

Specifies the number of retries to attempt when a request fails.

Values

  • Default: None

  • Data type: Map that contains the following parameter:

    ParameterDescriptionData typeDefault
    valueSpecifies the number of retries to attempt.IntegerNone

spec.rules.retries.onConditions

Specifies Envoy conditions that cause an automatic retry attempt.

Values

  • Default: None
  • Data type: Map of strings

spec.rules.retries.onConnnectFailure

Enables an automatic retry attempt when a connection failure error occurs.

Values

  • Default: false
  • Data type: Boolean

spec.rules.retries.onStatusCodes

Specifies the response status codes that are eligible for retry attempts.

Values

  • Default: None
  • Data type: Map of integers

spec.rules.timeouts

Specifies timeout logic when routing gRPC traffic

Values

  • Default: None
  • Data type: Map

spec.rules.timeouts.idle

Specifies the total amount of time permitted for the request stream to be idle before a timeout occurs.

This field accepts a string indicating the number of seconds. For example, indicate five seconds with 5s and five milliseconds with 0.005s.

Values

  • Default: None
  • Data type: String

spec.rules.timeouts.request

Specifies the total amount of time spent processing the entire downstream request, including retries, before triggering a timeout.

This field accepts a string indicating the number of seconds. For example, indicate five seconds with 5s and five milliseconds with 0.005s.

Values

  • Default: None
  • Data type: String

Examples

The following examples demonstrate common GRPCRoute CRD configuration patterns for specific use cases.

Split gRPC traffic between two ports

The following example splits traffic for the api service. GRPC traffic for services registered to the Consul catalog that are available at the api-workload port is split so that 50% of the traffic routes to the service at the api-workload port and 50% routes to the service at the admin-workload port.

apiVersion: mesh.consul.hashicorp.com/v2beta1
kind: GRPCRoute
metadata:
  name: api-split
  namespace: default
spec:
  parentRefs:
    - ref:
        type: 
          group: catalog
          groupVersion: v2beta1
          kind: Service
        name: api
      # The configuration targets the workload port, not the service port.
      port: "api-workload"
  rules:
    - backendRefs:
      - backendRef:
          ref: 
            type:
              group: catalog
              groupVersion: v2beta1
              kind: Service
            name: api
          # The configuration targets the workload port, not the service port.
          port: "api-workload"
        weight: 50
      - backendRef:
          ref: 
            type:
              group: catalog
              groupVersion: v2beta1
              kind: Service
            name: api
          # The configuration targets the workload port, not the service port.
          port: "admin-workload"
        weight: 50

Route traffic by matching header

The following example routes gRPC traffic for the api service according to its header. GRPC traffic for services registered to the Consul catalog that are available at the api-workload port are routed according to the following criteria:

  • For traffic with a header that contains a x-debug value of exactly 1, Consul modifies the response and request headers and routes to the api service at the api-workload port.
  • For traffic with a header that contains a x-debug value of exactly 2, Consul modifies the response and request headers and routes to the api-admin service at the admin-workload port.

This example also includes how to include filters that modify request or response headers.

apiVersion: mesh.consul.hashicorp.com/v2beta1
kind: GRPCRoute
metadata:
  name: api-match-split
  namespace: default
spec:
  parentRefs:
    - ref:
        type: 
          group: catalog
          groupVersion: v2beta1
          kind: Service
        name: api
      # The configuration targets the workload port, not the service port.
      port: "api-workload"
  rules:
    - matches:
      - headers:
          - type: "HEADER_MATCH_TYPE_EXACT"
            name: "x-debug"
            value: "1"
      filters:
       - requestHeaderModifier:
           add:
           - name: "request-foo"
             value: "request-bar"
       - responseHeaderModifier:
           add:
           - name: "response-foo"
             value: "response-bar"
      backendRefs:
      - backendRef:
          ref:
            type:
              group: catalog
              groupVersion: v2beta1
              kind: Service
            name: api
          # The configuration targets the workload port, not the service port.
          port: "api-workload"
    - matches:
      - headers:
          - type: "HEADER_MATCH_TYPE_EXACT"
            name: "x-debug"
            value: "2"
      filters:
       - requestHeaderModifier:
           add:
           - name: "request-foo"
             value: "request-bar"
       - responseHeaderModifier:
           add:
           - name: "response-foo"
             value: "response-bar"
      backendRefs:
      - backendRef:
          ref:
            type:
              group: catalog
              groupVersion: v2beta1
              kind: Service
            name: api-admin
          # The configuration targets the workload port, not the service port.
          port: "admin-workload"