kubernetes-ansible

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/pawankkamboj/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

kubernetes HA architecture

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.