Setup Multi-node Kubernetes cluster with kubeadm and vagrant

Introduction

With reference to steps listed at Using kubeadm to Create a Cluster for setting up the Kubernetes cluster with kubeadm. I have been working on an automation to setup the cluster. The result of it is kubeadm-vagrant, a github project with simple steps to setup your kubernetes cluster with more control on vagrant based virtual machines.

Installation

  • Clone the kubeadm-vagrant repo

git clone https://github.com/coolsvap/kubeadm-vagrant

  • Choose your distribution of choice from CentOS/Ubuntu and move to the specific directory.
  • Configure the cluster parameters in Vagrantfile. Refer below for details of configuration options.

vi Vagrantfile

  • Spin up the cluster

vagrant up

  • This will spin up new Kubernetes cluster. You can check the status of cluster with following command,

sudo su

kubectl get pods –all-namespaces

Cluster Configuration Options

  1. You need to generate a KUBETOKEN of your choice to be used while creating the cluster. You will need to install kubeadm package on your host to create the token with following command

# kubeadm token generate

148a37.736fd53655b767b7

  1. BOX_IMAGE is currently default with “coolsvap/centos-k8s” box which is custom box created which can be used for setting up the cluster with basic dependencies for kubernetes node.
  2. Set SETUP_MASTER to true if you want to setup the node. This is true by default for spawning a new cluster. You can skip it for adding new minions.
  3. Set SETUP_NODES to true/false depending on whether you are setting up minions in the cluster.
  4. Specify NODE_COUNT as the count of minions in the cluster
  5. Specify  the MASTER_IP as static IP which can be referenced for other cluster configurations
  6. Specify NODE_IP_NW as the network IP which can be used for assigning dynamic IPs for cluster nodes from the same network as Master
  7. Specify custom POD_NW_CIDR of your choice
  8. Setting up kubernetes dashboard is still a WIP with K8S_DASHBOARD option.
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