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Build a Kubernetes cluster using k3s via Ansible

Author: https://github.com/itwars

K3s Ansible Playbook

Build a Kubernetes cluster using Ansible with k3s. The goal is easily install a Kubernetes cluster on machines running:

• Debian
• Ubuntu
• CentOS
• ArchLinux

on processor architecture:

• x64
• arm64
• armhf

System requirements

Deployment environment must have Ansible 2.4.0+ Master and nodes must have passwordless SSH access

Usage

First copy the sample inventory to inventory.yml.

cp inventory-sample.yml inventory.yml

Second edit the inventory file to match your cluster setup. For example:

k3s_cluster:
  children:
    server:
      hosts:
        192.16.35.11
    agent:
      hosts:
        192.16.35.12
        192.16.35.13

If needed, you can also edit vars section at the bottom to match your environment.

If multiple hosts are in the server group the playbook will automatically setup k3s in HA mode with embedded etcd. An odd number of server nodes is recommended (3,5,7). Read the offical documentation below for more information and options. https://rancher.com/docs/k3s/latest/en/installation/ha-embedded/ Using a loadbalancer or VIP as the API endpoint is preferred but not covered here.

Start provisioning of the cluster using the following command:

ansible-playbook playbook/site.yml -i inventory.yml

Kubeconfig

To confirm access to your Kubernetes cluster use the following:

kubectl get nodes