Ansible playbook to create a Highly Available kubernetes cluster using release (1.16.9) on Bare metal system (have been tested on CentOS 7, Ubuntu 18.04).
Requirements:
- Ansible 2.7
Download the Kubernetes-Ansible playbook and set up variable according to need in group variable file all.yml. Please read this file carefully and modify according to your need.
git clone https://github.com/bamishr/kubernetes-ansible.git
cd kubernetes-ansible
cp group_vars/all.yml.example group_vars/all.yml
ansible-playbook -i inventory cluster.yml
Ansible roles
- yum-proxy - installs Squid proxy server
- yum-repo - installs epel repo
- sslcert - create all ssl certificates require to run secure K8S cluster
- runtime-env - common settings for container runtime environment
- docker - install latest docker release on all cluster nodes
- containerd - IF you want to use containerd runtime instead of Docker, use this role and enable this in group variable file
- etcd - setup etcd cluster, running as container on all master nodes
- haproxy - setup haproxy for API service HA, running on all master nodes
- keepalived - using keepalive for HA of IP address for kube-api server, running on all master nodes
- master - setup kubernetes master controller components -
kube-apiserver
,kube-controller
,kube-scheduler
,kubectl
client - node - setup kubernetes node agent -
kubelet
- addon - to create addon services:
flanneld
,kube-proxy
,kube-dns
,metrics-server
Note - Addon roles should be run after cluster is fully operational. Addons are in addons.yml playbook.
After cluster is up and running then run addon.yml
to deploy add-ons.
Included addons are: flannel network
, kube-proxy
, coredns
.
ansible-playbook -i inventory addon.yml
Below is a sample Kubernetes cluster architecture after successfully building it using playbook. It is just a sample, so number of servers/node may vary according to your setup.