mirror of https://github.com/hashicorp/consul
358 lines
35 KiB
Markdown
358 lines
35 KiB
Markdown
---
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layout: docs
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page_title: Consul API Gateway Install
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description: >-
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Installing Consul API Gateway
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---
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# Installing Consul API Gateway
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This topic describes how to use the Consul API Gateway add-on module. It includes instructions for installation and configuration.
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## Requirements
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Ensure that the environment you are deploying Consul API Gateway in meets the requirements listed in the [Technical Specifications][tech-specs]. This includes validating that the requirements for minimum versions of software are met. See the [Release Notes][rel-notes] for the version of API Gateway you are deploying.
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## Installation
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-> **NOTE:** When you see `VERSION` in examples of commands or configuration settings, replace `VERSION` with the version number of the release you are installing, like `0.2.0`. If there is a lower case "v" in front of `VERSION` the version number needs to follow the "v" as is `v0.2.0`
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1. Issue the following command to install the CRDs:
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```shell-session
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$ kubectl apply --kustomize="github.com/hashicorp/consul-api-gateway/config/crd?ref=vVERSION"
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```
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1. Create a `values.yaml` file for your Consul API Gateway deployment. Copy the content below into the `values.yaml` file. The `values.yaml` will be used by the Consul Helm chart. Available versions of the [Consul](https://hub.docker.com/r/hashicorp/consul/tags) and [Consul API Gateway](https://hub.docker.com/r/hashicorp/consul-api-gateway/tags) Docker images can be found on DockerHub, with additional context on version compatibility published in [GitHub releases](https://github.com/hashicorp/consul-api-gateway/releases). See [Helm Chart Configuration - apiGateway](https://www.consul.io/docs/k8s/helm#apigateway) for more available options on how to configure your Consul API Gateway deployment via the Helm chart.
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<CodeBlockConfig hideClipboard filename="values.yaml">
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```yaml
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global:
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name: consul
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connectInject:
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enabled: true
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controller:
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enabled: true
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apiGateway:
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enabled: true
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image: hashicorp/consul-api-gateway:VERSION
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```
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</CodeBlockConfig>
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1. Install Consul API Gateway using the standard Consul Helm chart and specify the custom values file. Available versions of the [Consul Helm chart](https://github.com/hashicorp/consul-k8s/releases) can be found in GitHub releases.
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```shell-session
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$ helm install consul hashicorp/consul --version 0.43.0 --values values.yaml --create-namespace --namespace consul
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```
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## Usage
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1. Verify that the [requirements](#requirements) have been met.
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1. Verify that the Consul API Gateway CRDs and controller have been installed and applied (see [Installation](#installation)).
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1. Configure the artifacts described below in [Configuration](#configuration).
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<CodeBlockConfig hideClipboard filename="values.yaml">
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```yaml
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apiGateway:
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managedGatewayClass:
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enabled: true
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```
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</CodeBlockConfig>
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1. Issue the `kubectl apply` command to implement the configurations, e.g.:
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```shell-session
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$ kubectl apply -f gateway.yaml routes.yaml
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```
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<!--- Commented out per https://github.com/hashicorp/consul/pull/11951/files#r791204596
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### Using the Consul API Gateway Binary
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You can download the Consul API Gateway binary and use it to manually start the control plane server.
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1. Download the binary from the [Consul API Gateway repository](https://github.com/hashicorp/consul-api-gateway).
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1. Navigate to the `consul-api-gateway-main` directory and build the binary:
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```shell-session
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$ go build
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```
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1. (Optional) Copy the binary to the execution path, e.g.:
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```shell-session
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$ cp consul-api-gateway /usr/bin
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```
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1. Use the `server` command to interact with the Consul API Gateway binary:
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```shell-session
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$ ./consul-api-gateway server <options>
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```
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The following options are supported:
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| Option | Description | Required | Default |
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| ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- | ----------------------------------------------------------------------- |
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| `-ca-file` | String value that specifies the path to the CA for the Consul server. | Required | none |
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| `-ca-secret` | String value that specifies the CA secret for the Consul server. | Required | none |
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| `-ca-secret-namespace` | String value that specifies the CA secret namespace for the Consul server. | Required | none |
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| `-k8-context` | String value that specifies the Kubernetes context to use when starting the Consul server. | Optional | current context |
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| `-k8-namespace` | String value that specifies the Kubernetes namespace to use when starting the Consul server. | Optional | `default` |
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| `-log-json` | Boolean value that enables or disables JSON format for the log output. | Required | `false` |
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| `-log-level` | String value that specifies the logging level. The following values are supported: <br/>- `trace` (highest level of detail) <br/>- `debug` <br/>- `info` <br/>- `warn` <br/>- `error` | Optional | `info` |
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| `-metrics-port` | Integer value that specifies the port number for collecting metrics. | Optional | none |
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| `-pprof` | Integer value that specifies the Go pprof port number for collecting metrics. | Optional | none |
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| `-sds-server-host` | String value that specifies the host server for the secret discovery service (SDS). | Optional | `consul-api-gateway-controller.default.`<br/>`svc.cluster.`<br/>`local` |
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| `-sds-server-host` | Integer value that specifies the port number for the secret discovery service (SDS). | Optional | `9090` |
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You can also issue the `version` command to print the Consul API Gateway version to the console:
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```shell-session
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$ ./consul-api-gateway version
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consul-api-gateway 0.1.0
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```
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--->
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## Configuration
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Configure the following artifacts to facilitate ingress into your Consul service mesh:
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- [GatewayClassConfig](#gatewayclassconfig): Describes additional Consul API Gateway-related configuration parameters for the `GatewayClass` resource.
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- [GatewayClass](#gatewayclass): Defines a class of gateway resources that you can use as a template for creating gateways.
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- [Gateway](#gateway): Defines the main infrastructure resource that links API gateway components. It specifies the name of the `GatewayClass` and one or more `listeners` (see [Listeners](#listeners)), which specify the logical endpoints bound to the gateway's addresses.
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- [Routes](#routes): Specifies the path from the client to the listener.
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-> **Note:** Add the following `managedGatewayClass` configuration to the `values.yaml` Helm configuration to enable the `GatewayClassConfig` and `GatewayClass` to be created automatically. The gateway, listeners, and routes will need to be configured manually. When `managedGatewayClass` is enabled, the [`serviceType`](/docs/k8s/helm#v-apigateway-managedgatewayclass-servicetype) for a managed `GatewayClass` will also default to `LoadBalancer`, which is appropriate for most deployments to managed Kubernetes cloud offerings (i.e., EKS, GKE, AKS). Other deployments, such as to a [kind](https://kind.sigs.k8s.io/) cluster, may require specifying `NodePort` or `ClusterIP`, instead.
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### GatewayClassConfig
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The `GatewayClassConfig` object describes Consul API Gateway-related configuration parameters for the [`GatewayClass`](#gatewayclass).
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Add the `kind: GatewayClassConfig` option to the gateway values file to declare a gateway class.
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The following example creates a gateway class configuration called `test-gateway-class-config`:
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<CodeBlockConfig filename="gateway.yaml">
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```yaml
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apiVersion: api-gateway.consul.hashicorp.com/v1alpha1
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kind: GatewayClassConfig
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metadata:
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name: test-gateway-class-config
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spec:
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useHostPorts: true
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logLevel: 'trace'
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consul:
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scheme: 'https'
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ports:
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http: 8501
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grpc: 8502
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```
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</CodeBlockConfig>
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The following table describes the allowed parameters for the `spec` array:
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| Parameter | Description | Type | Default |
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| --- | --- | ---- | ------- |
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| `consul.address` | Specifies the address of the Consul server to communicate with in the gateway pod. If unspecified, the pod will attempt to use a local agent on the host on which the pod is running. | String | N/A |
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| `consul.authentication.account` | Specifies the Kubernetes service account to use for authentication. | String | N/A |
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| `consul.authentication.managed` | Set to `true` to enable deployments to run with managed service accounts created by the gateway controller. The `consul.authentication.account` field is ignored when this option is enabled. | Boolean | `false` |
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| `consul.authentication.method` | Specifies the Consul auth method used for initial authentication by Consul API Gateway. | String | N/A |
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| `consul.authentication.namespace` | Specifies the Consul namespace to use for authentication. | String | N/A |
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| `consul.ports.grpc` | Specifies the gRPC port for Consul's xDS server. | Integer | `8502` |
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| `consul.ports.http` | Specifies the port for Consul's HTTP server. | Integer | `8500` |
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| `consul.scheme` | Specifies the scheme to use for connecting to Consul. The supported values are `"http"` and `"https"`. | String | `"http"` |
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| `copyAnnotations.service` | List of annotations to copy to the gateway service. | Array | `["external-dns.alpha.kubernetes.io/hostname"]` |
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| `deployment.defaultInstances` | Specifies the number of gateway instances that should be deployed by default. | Integer | 1 |
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| `deployment.maxInstances` | Specifies the maximum allowed number of gateway instances. | Integer | 8 |
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| `deployment.minInstances` | Specifies the minimum allowed number of gateway instances. | Integer | 1 |
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| `image.consulAPIGateway` | The image to use for consul-api-gateway. View available image tags on [DockerHub](https://hub.docker.com/r/hashicorp/consul-api-gateway/tags). | String | `"hashicorp/consul-api-gateway:RELEASE_VERSION"` |
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| `image.envoy` | Specifies the container image to use for Envoy. View available image tags on [DockerHub](https://hub.docker.com/r/envoyproxy/envoy/tags). | String | `"envoyproxy/envoy:RELEASE_VERSION"` |
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| `logLevel` | Specifies the error reporting level for logs. You can specify the following values: `error`, `warning`, `info`, `debug`, `trace`. | String | `"info"` |
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| `nodeSelector` | Specifies a set of parameters that constrain the nodes on which the pod can run. Defining nodes with the `nodeSelector` enables the pod to fit on a node. The selector must match a node's labels for the pod to be scheduled on that node. Refer to the [Kubernetes documentation](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/) for additional information. | Object | N/A |
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| `serviceType` | Specifies the ingress methods for a service. The following values are supported: <br/>`ClusterIP` <br/>`NodePort` <br/>`LoadBalancer`. | String | N/A |
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| `useHostPorts` | If set to `true`, then the Envoy container ports are mapped to host ports. | Boolean | `false` |
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Refer to the [Consul API Gateway repository](https://github.com/hashicorp/consul-api-gateway/blob/main/config/crd/bases/api-gateway.consul.hashicorp.com_gatewayclassconfigs.yaml) for the complete specification.
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### GatewayClass
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The `GatewayClass` resource is used as a template for creating `Gateway` resources.
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The specification includes the name of the controller (`controllerName`) and an API object containing controller-specific configuration resources within the cluster (`parametersRef`).
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The value of the `controllerName` field must be set to `hashicorp.com/consul-api-gateway-controller`.
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When gateways are created from a `GatewayClass`, they use the parameters specified in the `GatewayClass` at the time of instantiation.
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Add the `kind: GatewayClass` option to the the gateway values file to declare a gateway class.
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The following example creates a gateway class called `test-gateway-class`:
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<CodeBlockConfig filename="gateway.yaml">
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```yaml
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apiVersion: gateway.networking.k8s.io/v1alpha2
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kind: GatewayClass
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metadata:
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name: test-gateway-class
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spec:
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controllerName: 'hashicorp.com/consul-api-gateway-controller'
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parametersRef:
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group: api-gateway.consul.hashicorp.com
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kind: GatewayClassConfig
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name: test-gateway-class-config
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```
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</CodeBlockConfig>
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Refer to the [Kubernetes Gateway API documentation](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.GatewayClass) for details about configuring gateway classes.
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### Gateway
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The gateway configuration is the main infrastructure resource that links API gateway components. It specifies the name of the `GatewayClass` and one or more `listeners`.
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Add the `kind: Gateway` option to the configuration file to declare a gateway.
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The following example creates a gateway called `example-gateway`.
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The gateway is based on the `test-gateway-class` and includes a listener called `https` (see [Listeners](#listeners) for details about the `listener` configuration).
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<CodeBlockConfig filename="gateway.yaml">
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```yaml
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apiVersion: gateway.networking.k8s.io/v1alpha2
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kind: Gateway
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metadata:
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name: example-gateway
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annotations:
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'external-dns.alpha.kubernetes.io/hostname': DNS_HOSTNAME
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spec:
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gatewayClassName: test-gateway-class
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listeners:
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- protocol: HTTPS
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hostname: DNS_HOSTNAME
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port: 443
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name: https
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allowedRoutes:
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namespaces:
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from: Same
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tls:
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certificateRefs:
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- name: gateway-production-certificate
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```
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</CodeBlockConfig>
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Refer to the [Kubernetes Gateway API documentation](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.Gateway) for details about configuring gateways:
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#### Listeners
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Listeners are the logical endpoints bound to the gateway's addresses.
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Add the `listener` object to the `gateway` configuration and specify the following properties to define a listener:
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| Parameter | Description | Type | Default |
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| ------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | --------------- |
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| `hostname` | Specifies the virtual hostname to match for protocol types. | String | none |
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| `port` | Specifies the network port number. | Integer | none |
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| `protocol` | Specifies the network protocol expected by the listener. | String | `http` |
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| `tls` | Collection of parameters that specify TLS options for the listener. Refer to the [`GatewayTLSConfig`](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.GatewayTLSConfig) documentation for additional information about configuring TLS. | Object | N/A |
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| `tls.mode` | Specifies a mode for operating Consul API Gateway listeners over TLS. <br/>You can only specify the `Terminate` mode, which configures the TLS session between the downstream client and the gateway to terminate at the gateway. <br/>Refer to the [`TLSModeType` documentation](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TLSModeType) for additional information. | String | `Terminate` |
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| `tls.certificateRefs` | Specifies the name of secret object used for Envoy SDS (Secret Discovery Service) to support terminating TLS. Refer to the [`[]*SecretObjectReference` documentation](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.SecretObjectReference) for additional information. | String | N/A |
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| `tls.options` | Specifies key/value pairs to enable extended TLS configuration specific to an implementation. | Object | N/A |
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| `tls.options.tls_min_version` | Specifies the minimum TLS version supported for the listener. The following values are supported: `TLS_AUTO`, `TLSv1_0`, `TLSv1_1`, `TLSv1_2`, `TLSv1_3`. | String | `TLS 1.2` |
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| `tls.options.tls_max_version` | Specifies the maximum TLS version supported for the listener. The specified version must be greater than or equal to `TLSMinVersion`. The following values are supported: `TLS_AUTO`, `TLSv1_0`, `TLSv1_1`, `TLSv1_2`, `TLSv1_3`. | String | `TLS 1.3` |
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| `tls.options.tls_cipher_suites` | Specifies the list of TLS cipher suites to support when negotiating connections using TLS 1.2 or earlier. <br/>If unspecified, a [more secure set of cipher suites](https://github.com/hashicorp/consul-api-gateway/blob/main/internal/common/tls.go#L3-L10) than Envoy's current [default server cipher list](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/transport_sockets/tls/v3/common.proto#envoy-v3-api-field-extensions-transport-sockets-tls-v3-tlsparameters-cipher-suites) will be used. <br/>The full list of supported cipher suites can seen in [`internal/common/tls.go`](https://github.com/hashicorp/consul-api-gateway/blob/main/internal/common/tls.go) and is dependent on underlying support in Envoy. | String | See description |
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Refer to the [Kubernetes Gateway API documentation](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.Listener) for details about configuring listeners.
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### Route
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Routes are independent configuration objects that are associated with specific listeners.
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Declare a route with either `kind: HTTPRoute` or `kind: TCPRoute` and configure the route parameters in the `spec` block.
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Refer to the Kubernetes Gateway API documentation for each object type for details:
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- [HTTPRoute](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.HTTPRoute)
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- [TCPRoute](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TCPRoute)
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The following example creates a route named `example-route` associated with a listener defined in `example-gateway`.
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<CodeBlockConfig filename="routes.yaml">
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```yaml
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apiVersion: gateway.networking.k8s.io/v1alpha2
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kind: HTTPRoute
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metadata:
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name: example-route
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spec:
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parentRefs:
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- name: example-gateway
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rules:
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- backendRefs:
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- kind: Service
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name: echo
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port: 8080
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```
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</CodeBlockConfig>
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To create a route for a `backendRef` in a different namespace, you must also
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create a [ReferencePolicy](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.ReferencePolicy).
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The following example creates a route named `example-route` in namespace `gateway-namespace`. This route has a `backendRef` in namespace `service-namespace`. Traffic is allowed because the `ReferencePolicy`, named `reference-policy` in namespace `service-namespace`, allows traffic from `HTTPRoutes` in `gateway-namespace` to `Services` in `service-namespace`.
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<CodeBlockConfig filename="route_with_referencepolicy.yaml">
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```yaml
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apiVersion: gateway.networking.k8s.io/v1alpha2
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kind: HTTPRoute
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metadata:
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name: example-route
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namespace: gateway-namespace
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spec:
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parentRefs:
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- name: example-gateway
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rules:
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- backendRefs:
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- kind: Service
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name: echo
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namespace: service-namespace
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port: 8080
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---
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apiVersion: gateway.networking.k8s.io/v1alpha2
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kind: ReferencePolicy
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metadata:
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name: reference-policy
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namespace: service-namespace
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spec:
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from:
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- group: gateway.networking.k8s.io
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kind: HTTPRoute
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namespace: gateway-namespace
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to:
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- group: ""
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kind: Service
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name: echo
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```
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</CodeBlockConfig>
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### MeshService
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The `MeshService` configuration holds a reference to an externally-managed Consul service mesh service and can be used as a `backendRef` for a [`Route`](#route).
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| Parameter | Description | Type | Default |
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| ------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | --------------- |
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| `name` | Specifies the service name for a Consul service. It is assumed this service will exist in either the `consulDestinationNamespace` or mirrored Consul namespace from where this custom resource is defined, depending on the Helm configuration.
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Refer to the [Consul API Gateway repository](https://github.com/hashicorp/consul-api-gateway/blob/main/config/crd/bases/api-gateway.consul.hashicorp.com_meshservices.yaml) for the complete specification.
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<!--
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****** KEEP ALL PAGE CONTENT ABOVE THIS LINE *******
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Only Reference style links should be added below this comment
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--->
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[tech-specs]: /docs/api-gateway/tech-specs
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[rel-notes]: /docs/release-notes
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