fengren / kubernetes-ansible

Setup High-Available Kubernetes cluster using Ansible

kubernetes-ansible

Ansible playbook to create a Highly Available kubernetes cluster using latest release 1.11.3 on Bare metal system(CentOS-7.x). Ansible version "2.4" is require to use this playbook.

Requirements:-

• Ansible
• CentOS-7.x

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
ansible-playbook -i inventory cluster.yml

Ansible roles

• yum-repo - install epel repo
• sslcert - create all ssl certificates require to run secure K8S cluster
• docker - install latest docker release on all cluster nodes
• containerd - IF 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, run on all master nodes
• keepalived - using keepalive for HA of IP address for kube-api server, run 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 service 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-on.
included addon are, flannel network, kube-proxy, kube-dns and kube-dashboard
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.