mirror of https://github.com/hashicorp/consul
trujillo-adam
3 years ago
parent
4cd2542a3e
commit
b3496a337a
@ -0,0 +1,171 @@
|
|||||||
|
---
|
||||||
|
layout: docs
|
||||||
|
page_title: API Gateway
|
||||||
|
description: Using Consul API gateway functionality
|
||||||
|
---
|
||||||
|
|
||||||
|
# Consul API Gateway
|
||||||
|
|
||||||
|
This topic describes how to use the Consul API Gateway module, which enables applications and services running in a datacenter to be accessed by network clients outside the datacenter. This type of network traffic is commonly referred to as "north-south" network traffic.
|
||||||
|
|
||||||
|
## Introduction
|
||||||
|
|
||||||
|
Consul API Gateway is an implementation of the Kubernetes Gateway API Specification (https://gateway-api.sigs.k8s.io/). The specification defines a set of custom resource definitions (CRD) that can create logical gateways and routes.
|
||||||
|
|
||||||
|
## Requirements
|
||||||
|
|
||||||
|
Your datacenter must meet the following requirements prior to configuring the Consul API Gateway:
|
||||||
|
|
||||||
|
- A Kubernetes cluster must be running
|
||||||
|
- Consul 1.11.0+
|
||||||
|
|
||||||
|
## Installation
|
||||||
|
|
||||||
|
1. Create a values file for your Consul server agents that contains the following parameters:
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
global:
|
||||||
|
name: consul
|
||||||
|
image: 'hashicorp/consul:1.11.0'
|
||||||
|
tls:
|
||||||
|
enabled: true
|
||||||
|
connectInject:
|
||||||
|
enabled: true
|
||||||
|
controller:
|
||||||
|
enabled: true
|
||||||
|
```
|
||||||
|
|
||||||
|
1. Install Consul API Gateway using the standard Consul Helm chart and specify the custom values file.
|
||||||
|
|
||||||
|
```shell-session
|
||||||
|
helm install consul hashicorp/consul --version 0.37.0 -f values.yaml
|
||||||
|
```
|
||||||
|
|
||||||
|
The following components will be installed:
|
||||||
|
|
||||||
|
- Gateway controller
|
||||||
|
- CRDs required by the Kubernetes Gateway API specification
|
||||||
|
- `kustomize` manifests for completing the installation
|
||||||
|
|
||||||
|
1. After `helm` installs Consul API Gateway packages, issue the following commands to apply the API gateway to your Kubernetes cluster.
|
||||||
|
|
||||||
|
```shell-session
|
||||||
|
kubectl apply -k "github.com/hashicorp/consul-api-gateway/config/crd?ref=v0.1.0-techpreview"
|
||||||
|
kubectl apply -k "github.com/hashicorp/consul-api-gateway/config?ref=v0.1.0-techpreview"
|
||||||
|
```
|
||||||
|
|
||||||
|
## Usage
|
||||||
|
|
||||||
|
1. Verify that the [requirements](#requirements) have been met.
|
||||||
|
1. Verify that the Consul API Gateway software has been installed and applied (see [Installation](#installation)).
|
||||||
|
1. Configure the gateway, listener(s), and route(s) as described in [Configuration](#configuration)
|
||||||
|
1. Issue the `kubectl apply` command to implement the configurations, e.g.:
|
||||||
|
|
||||||
|
```shell-session
|
||||||
|
kubectl apply -f gateway-configuration.yaml
|
||||||
|
```
|
||||||
|
|
||||||
|
### Using the Consul API Gateway Binary
|
||||||
|
|
||||||
|
You can manually start the Consul API Gateway control plane server using the binary located in the home directory to issue the `server` command:
|
||||||
|
|
||||||
|
```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` | context to use when starting the Consul server. | Required | `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.svc.cluster.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-dev
|
||||||
|
```
|
||||||
|
|
||||||
|
## Configuration
|
||||||
|
|
||||||
|
Create the following artifacts to configure the API Gateway:
|
||||||
|
|
||||||
|
- [Gateway](#gateway): Defines the gateway properties, including listeners.
|
||||||
|
- [Listeners](#listeners): Defines listener properties, such as protocol, port, and namespace.
|
||||||
|
- [Routes](#routes): Specifies the path from the client to the listener.
|
||||||
|
|
||||||
|
### Gateway
|
||||||
|
|
||||||
|
The gateway object contains gateway listeners.
|
||||||
|
Add the `kind: Gateway` option to the configuration file to declare a gateway.
|
||||||
|
The following example creates a gateway called `example-gateway` that includes a listener called `https` (see Listeners for details about the `listener` configuration).
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
apiVersion: gateway.networking.k8s.io/v1alpha2
|
||||||
|
kind: Gateway
|
||||||
|
metadata:
|
||||||
|
name: example-gateway
|
||||||
|
annotations:
|
||||||
|
'external-dns.alpha.kubernetes.io/hostname': DNS_HOSTNAME
|
||||||
|
spec:
|
||||||
|
gatewayClassName: default-consul-gateway-class
|
||||||
|
listeners:
|
||||||
|
- protocol: HTTPS
|
||||||
|
hostname: DNS_HOSTNAME
|
||||||
|
port: 443
|
||||||
|
name: https
|
||||||
|
allowedRoutes:
|
||||||
|
namespaces:
|
||||||
|
from: Same
|
||||||
|
tls:
|
||||||
|
certificateRefs:
|
||||||
|
- name: gateway-production-certificate
|
||||||
|
```
|
||||||
|
|
||||||
|
Refer to the Kubernetes Gateway API documentation for details about configuring gateways:
|
||||||
|
https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.Gateway
|
||||||
|
|
||||||
|
### Listener
|
||||||
|
|
||||||
|
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:
|
||||||
|
|
||||||
|
- `hostname`: Hostname specifies the virtual hostname to match for protocol types.
|
||||||
|
- `port`: Specifies the network port.
|
||||||
|
- `protocol`: Specifies the network protocol expected by the listener.
|
||||||
|
|
||||||
|
Refer to the Kubernetes Gateway API documentation for details about configuring listeners:
|
||||||
|
https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.Listener
|
||||||
|
|
||||||
|
In the example included the [Gateway](#gateway) description, a listener named `https` that listens over `HTTPS` is configured to listen on port `443`
|
||||||
|
|
||||||
|
### Route
|
||||||
|
|
||||||
|
Routes are independent configuration objects that are associated with a specific listener.
|
||||||
|
Use the `kind: HTTPRoute` option to declare a route and use the `spec` option to specify the route details.
|
||||||
|
The following example creates a route named `example-route` associated with a listener defined in `example-gateway`.
|
||||||
|
|
||||||
|
```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
|
||||||
|
```
|
||||||
Loading…
Reference in new issue