How to deploy a Consul cluster on Kubernetes?

2 years ago
Olivia Parker
2 minutes

To deploy a Consul cluster on Kubernetes (K8s), you can proceed with the following steps:

  1. configuration file for consul
apiVersion: v1
kind: ConfigMap
metadata:
  name: consul-config
data:
  server.hcl: |
    datacenter = "dc1"
    data_dir = "/consul/data"
    log_level = "INFO"
    enable_syslog = true
    performance {
      raft_multiplier = 1
    }
  1. configuration file for consul
apiVersion: v1
kind: Service
metadata:
  name: consul
  labels:
    app: consul
spec:
  ports:
  - port: 8500
    name: http
  - port: 8600
    name: dns
    protocol: UDP
  selector:
    app: consul
---
apiVersion: v1
kind: Service
metadata:
  name: consul-dns
  labels:
    app: consul
spec:
  ports:
  - port: 53
    name: dns-tcp
    protocol: TCP
  - port: 53
    name: dns-udp
    protocol: UDP
  selector:
    app: consul
  1. deployment configuration file for consul
apiVersion: apps/v1
kind: Deployment
metadata:
  name: consul
spec:
  replicas: 3
  selector:
    matchLabels:
      app: consul
  template:
    metadata:
      labels:
        app: consul
    spec:
      containers:
      - name: consul
        image: consul:latest
        args:
        - "agent"
        - "-config-dir=/consul/config"
        - "-client=0.0.0.0"
        - "-ui"
        - "-retry-join=consul-0.consul,consul-1.consul,consul-2.consul"
        ports:
        - containerPort: 8500
          name: http
        - containerPort: 8600
          name: dns
          protocol: UDP
        volumeMounts:
        - name: consul-config
          mountPath: /consul/config
        - name: consul-data
          mountPath: /consul/data
      volumes:
      - name: consul-config
        configMap:
          name: consul-config
      - name: consul-data
        emptyDir: {}
  1. Create a Consul cluster: Run the following command to create a Consul cluster:
kubectl apply -f consul-config.yaml
kubectl apply -f consul.yaml
kubectl apply -f consul-deployment.yaml

In the above steps, we first created a ConfigMap to store the configuration files of Consul. Next, we created a Service to expose the HTTP and DNS ports of Consul. Finally, we created a Deployment to run Consul’s Pod and mounted the ConfigMap and EmptyDir into the Pod.

Please note that the above steps only demonstrate the basic steps for deploying a Consul cluster, adjustments may be necessary based on specific environments and requirements during actual implementation.

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