149 lines
No EOL
5 KiB
Markdown
149 lines
No EOL
5 KiB
Markdown
# Kubernetes
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## Setup Kubernetes EasyHAProxy
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EasyHAProxy for Kubernetes operates by querying all ingress definitions with the annotation
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`kubernetes.io/ingress.class: easyhaproxy-ingress`. Upon finding this annotation,
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EasyHAProxy immediately sets up HAProxy and begins serving traffic.
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For Kubernetes installations, there are three available installation modes:
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- DaemonSet: This mode exposes ports 80, 443, and 1936.
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- NodePort: Ports 31080, 31443, and 31936 are exposed.
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- ClusterIP: In this mode, no ports are exposed externally, and HAProxy is accessible only within the cluster.
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To install EasyHAProxy in your Kubernetes cluster, follow these steps:
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### 1) Identify the node where your EasyHAProxy container will run
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EasyHAProxy will be limited to a single node. To understand that see [limitations](limitations.md) page.
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```bash
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$ kubectl get nodes
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NAME STATUS ROLES AGE VERSION
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node-01 Ready <none> 561d v1.21.13-3
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node-02 Ready <none> 561d v1.21.13-3
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```
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Add the EasyHAProxy label to the node.
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```bash
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kubectl label nodes node-01 "easyhaproxy/node=master"
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```
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### 2) Install EasyHAProxy with Kubernetes Manifest
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```bash
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kubectl create namespace easyhaproxy
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kubectl apply -f \
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https://raw.githubusercontent.com/byjg/docker-easy-haproxy/4.4.0/deploy/kubernetes/easyhaproxy-daemonset.yml
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```
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If necessary, you can configure environment variables. To get a list of the variables, please follow the [environment variable guide](environment-variable.md)
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## Running containers
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Your container only requires creating an ingress with the annotation `kubernetes.io/ingress.class: easyhaproxy-ingress` pointing to your service.
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e.g.
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```yaml
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kind: Ingress
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metadata:
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annotations:
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kubernetes.io/ingress.class: easyhaproxy-ingress
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name: example-ingress
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namespace: example
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spec:
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rules:
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- host: example.org
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http:
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paths:
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- backend:
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service:
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name: example-service
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port:
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number: 8080
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pathType: ImplementationSpecific
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```
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Once the container is running, EasyHAProxy will detect automatically and start to redirect all traffic from `example.org:80` to your container at port 8080.
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You don't need to expose any port in your container.
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Notes:
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- At this point, the implementation doesn't support all ingress properties or wildcard domains.
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- The ingress will publish the ports 80 and 443, plus 1936 if stats are enabled.
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- EasyHAProxy will read all `spec.rules[].host` spec, however it will parse only the first path `spec.rules[].http.paths[0].port.number` for each rule, and ignore the other paths.
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## Kubernetes annotations
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| annotation | Description | Default | Example |
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|----------------------------------|-------------------------------------------------------------------------------------|--------------|----------------------------|
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| kubernetes.io/ingress.class | (required) Activate EasyHAProxy. | **required** | easyhaproxy-ingress |
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| easyhaproxy.redirect_ssl | (optional) Boolean. Force redirect all endpoints to HTTPS. | false | true or false |
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| easyhaproxy.certbot | (optional) Boolean. It will request certbot certificates for the ingresses domains. | false | true or false |
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| easyhaproxy.redirect | (optional) JSON. Key pair with a domain and its destination. | *empty* | \{"domain":"redirect_url"} |
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| easyhaproxy.mode | (optional) Set the HTTP mode for that connection. | http | http or tcp |
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| easyhaproxy.listen_port | (optional) Set the an additional port for that ingress | http | http or tcp |
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**Important**: The annotations are per ingress and applied to all hosts in that ingress configuration.
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## Certbot / ACME / Letsencrypt
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It is necessary add the annotation `easyhaproxy.certbot` to the ingress configuration:
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```yaml
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kind: Ingress
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metadata:
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annotations:
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kubernetes.io/ingress.class: easyhaproxy-ingress
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easyhaproxy.certbot: 'true'
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name: example-ingress
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namespace: example
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spec:
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....
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```
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More info [here](acme.md).
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Make sure your cluster is accessible both through ports 80 and 443.
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## Custom SSL Certificates
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Create a secret with your certificate and key and associate them with your ingress.
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```yaml
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---
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apiVersion: v1
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kind: Secret
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metadata:
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name: host2-tls
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namespace: default
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data:
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tls.crt: base64 of your certificate
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tls.key: base64 of your certificate private key
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type: kubernetes.io/tls
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---
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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annotations:
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kubernetes.io/ingress.class: easyhaproxy-ingress
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name: tls-example
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namespace: default
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spec:
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tls:
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- hosts:
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- host2.local
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secretName: host2-tls
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rules:
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...
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```
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----
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[Open source ByJG](http://opensource.byjg.com) |