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---
layout: docs
page_title: Consul API Gateway Usage
description: >-
Using Consul API gateway functionality
---
# Consul API Gateway Usage
This topic describes how to use the Consul API Gateway add-on module. It includes instructions for installation and configuration.
## Requirements
Refer to [Technical Specifications](/docs/api-gateway/tech-specs) for minimum software requirements.
## Installation
1. Issue the following command to install the CRDs:
<CodeBlockConfig>
```shell-session
$ kubectl apply --kustomize="github.com/hashicorp/consul-api-gateway/config/crd?ref=v0.1.0"
```
</CodeBlockConfig>
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. 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.
<CodeBlockConfig hideClipboard filename="values.yaml">
```yaml
global:
name: consul
image: 'hashicorp/consul:1.11.2'
connectInject:
enabled: true
controller:
enabled: true
apiGateway:
enabled: true
image: hashicorp/consul-api-gateway:0.1.0
```
</CodeBlockConfig>
1. Install Consul API Gateway using the standard Consul Helm chart and specify the custom values file.
<CodeBlockConfig>
```shell-session
$ helm install consul hashicorp/consul --version 0.41.0 --values values.yaml
```
</CodeBlockConfig>
## Usage
1. Verify that the [requirements](#requirements) have been met.
1. Verify that the Consul API Gateway CRDs and controller have been installed and applied (see [Installation](#installation)).
1. Configure the artifacts described below in [Configuration](#configuration). If the following config is added to the `values.yaml` Helm config, the GatewayClassConfig and GatewayClass will be created automatically, and only the Gateway, Listeners and Routes will need to be configured manually. The [`serviceType`](https://www.consul.io/docs/k8s/helm#v-apigateway-managedgatewayclass-servicetype) for a managed GatewayClass will default to `LoadBalancer`, which is appropriate for most deployments to managed Kubernetes cloud offerings (EKS, GKE, AKS) - other deployments, such as to a [kind](https://kind.sigs.k8s.io/) cluster, may require specifying `NodePort` or `ClusterIP` instead.
<CodeBlockConfig hideClipboard filename="values.yaml">
```yaml
apiGateway:
managedGatewayClass:
enabled: true
```
</CodeBlockConfig>
1. Issue the `kubectl apply` command to implement the configurations, e.g.:
<CodeBlockConfig>
```shell-session
$ kubectl apply -f gateway.yaml routes.yaml
```
</CodeBlockConfig>
<!--- Commented out per https://github.com/hashicorp/consul/pull/11951/files#r791204596
### Using the Consul API Gateway Binary
You can download the Consul API Gateway binary and use it to manually start the control plane server.
1. Download the binary from the [Consul API Gateway repository](https://github.com/hashicorp/consul-api-gateway).
1. Navigate to the `consul-api-gateway-main` directory and build the binary:
```shell-session
$ go build
```
1. (Optional) Copy the binary to the execution path, e.g.:
```shell-session
$ cp consul-api-gateway /usr/bin
```
1. Use the `server` command to interact with the Consul API Gateway binary:
```shell-session
$ ./consul-api-gateway server <options>
```
The following options are supported:
| Option | Description | Required | Default |
| ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- | ----------------------------------------------------------------------- |
| `-ca-file` | String value that specifies the path to the CA for the Consul server. | Required | none |
| `-ca-secret` | String value that specifies the CA secret for the Consul server. | Required | none |
| `-ca-secret-namespace` | String value that specifies the CA secret namespace for the Consul server. | Required | none |
| `-k8-context` | String value that specifies the Kubernetes context to use when starting the Consul server. | Optional | current context |
| `-k8-namespace` | String value that specifies the Kubernetes namespace to use when starting the Consul server. | Optional | `default` |
| `-log-json` | Boolean value that enables or disables JSON format for the log output. | Required | `false` |
| `-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` |
| `-metrics-port` | Integer value that specifies the port number for collecting metrics. | Optional | none |
| `-pprof` | Integer value that specifies the Go pprof port number for collecting metrics. | Optional | none |
| `-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` |
| `-sds-server-host` | Integer value that specifies the port number for the secret discovery service (SDS). | Optional | `9090` |
You can also issue the `version` command to print the Consul API Gateway version to the console:
```shell-session
$ ./consul-api-gateway version
consul-api-gateway 0.1.0
```
--->
## Configuration
Configure the following artifacts to facilitate ingress into your Consul service mesh:
- [GatewayClassConfig](#gatewayclassconfig): Describes additional Consul API Gateway-related configuration parameters for the `GatewayClass` resource.
- [GatewayClass](#gatewayclass): Defines a class of gateway resources that you can use as a template for creating gateways.
- [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.
- [Routes](#routes): Specifies the path from the client to the listener.
### GatewayClassConfig
The `GatewayClassConfig` object describes Consul API Gateway-related configuration parameters for the [`GatewayClass`](#gatewayclass).
Add the `kind: GatewayClassConfig` option to the gateway values file to declare a gateway class.
The following example creates a gateway class config called `test-gateway-class-config`:
<CodeBlockConfig filename="gateway.yaml">
```yaml
apiVersion: api-gateway.consul.hashicorp.com/v1alpha1
kind: GatewayClassConfig
metadata:
name: test-gateway-class-config
spec:
useHostPorts: true
logLevel: 'trace'
consul:
scheme: 'https'
ports:
http: 8501
grpc: 8502
```
</CodeBlockConfig>
The following table describes the allowed parameters for the `spec` array:
| Parameter | Description | Type | Default |
| --- | --- | ---- | ------- |
| `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 |
| `consul.authentication.account` | Specifies the Kubernetes service account to use for authentication. | String | N/A |
| `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` |
| `consul.authentication.method` | Specifies the Consul auth method used for initial authentication by Consul API Gateway. | String | N/A |
| `consul.authentication.namespace` | Specifies the Consul namespace to use for authentication. | String | N/A |
| `consul.ports.grpc` | Specifies the gRPC port for Consul's xDS server. | Integer | `8502` |
| `consul.ports.http` | Specifies the port for Consul's HTTP server. | Integer | `8500` |
| `consul.scheme` | Specifies the scheme to use for connecting to Consul. The supported values are `"http"` and `"https"`. | String | `"http"` |
| `copyAnnotations.service` | List of annotations to copy to the gateway service. | Array | `["external-dns.alpha.kubernetes.io/hostname"]` |
| `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"` |
| `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"` |
| `logLevel` | Specifies the error reporting level for logs. You can specify the following values: `error`, `warning`, `info`, `debug`, `trace`. | String | `"info"` |
| `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 |
| `serviceType` | Specifies the ingress methods for a service. The following values are supported: <br/>`ClusterIP` <br/>`NodePort` <br/>`LoadBalancer`. | String | N/A |
| `useHostPorts` | If set to `true`, then the Envoy container ports are mapped to host ports. | Boolean | `false` |
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.
### GatewayClass
The `GatewayClass` resource is used as a template for creating `Gateway` resources.
The specification includes the name of the controller (`controllerName`) and an API object containing controller-specific configuration resources within the cluster (`parametersRef`).
The value of the `controllerName` field must be set to `hashicorp.com/consul-api-gateway-controller`.
When gateways are created from a `GatewayClass`, they use the parameters specified in the `GatewayClass` at the time of instantiation.
Add the `kind: GatewayClass` option to the the gateway values file to declare a gateway class.
The following example creates a gateway class called `test-gateway-class`:
<CodeBlockConfig filename="gateway.yaml">
```yaml
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: GatewayClass
metadata:
name: test-gateway-class
spec:
controllerName: 'hashicorp.com/consul-api-gateway-controller'
parametersRef:
group: api-gateway.consul.hashicorp.com
kind: GatewayClassConfig
name: test-gateway-class-config
```
</CodeBlockConfig>
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.
### Gateway
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`.
Add the `kind: Gateway` option to the configuration file to declare a gateway.
The following example creates a gateway called `example-gateway`.
The gateway is based on the `test-gateway-class` and includes a listener called `https` (see [Listeners](#listeners) for details about the `listener` configuration).
<CodeBlockConfig filename="gateway.yaml">
```yaml
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: Gateway
metadata:
name: example-gateway
annotations:
'external-dns.alpha.kubernetes.io/hostname': DNS_HOSTNAME
spec:
gatewayClassName: test-gateway-class
listeners:
- protocol: HTTPS
hostname: DNS_HOSTNAME
port: 443
name: https
allowedRoutes:
namespaces:
from: Same
tls:
certificateRefs:
- name: gateway-production-certificate
```
</CodeBlockConfig>
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:
#### Listeners
Listeners are the logical endpoints bound to the gateway's addresses.
Add the `listener` object to the `gateway` configuration and specify the following properties to define a listener:
| Parameter | Description | Type | Default |
| ------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | --------------- |
| `hostname` | Specifies the virtual hostname to match for protocol types. | String | none |
| `port` | Specifies the network port number. | Integer | none |
| `protocol` | Specifies the network protocol expected by the listener. | String | `http` |
| `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 |
| `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` |
| `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 |
| `tls.options` | Specifies key/value pairs to enable extended TLS configuration specific to an implementation. | Object | N/A |
| `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` |
| `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` |
| `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 |
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.
### Route
Routes are independent configuration objects that are associated with specific listeners.
Declare a route with either `kind: HTTPRoute` or `kind: TCPRoute` and configure the route parameters in the `spec` block.
Refer to the Kubernetes Gateway API documentation for each object type for details:
- [HTTPRoute](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.HTTPRoute)
- [TCPRoute](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TCPRoute)
The following example creates a route named `example-route` associated with a listener defined in `example-gateway`.
<CodeBlockConfig filename="routes.yaml">
```yaml
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: HTTPRoute
metadata:
name: example-route
spec:
parentRefs:
- name: example-gateway
rules:
- backendRefs:
- kind: Service
name: echo
port: 8080
```
</CodeBlockConfig>
### MeshService
MeshService holds a reference to an externally managed Consul Service Mesh service, and can be used as a `backendRef` for a [`Route`](#route).
| Parameter | Description | Type | Default |
| ------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | --------------- |
| `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.
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.