easy-kube's Introduction

easy-kube

Setup a Kubernetes v1.4 cluster easily on CentOS 7

Overview

This project intends to show how easy it is to setup a v1.4 K8s cluster with minimal experience using Kubnernetes. I have adapted this project from the great guide: Installing Kubernetes on Linux with kubeadm

Requrements

Ansible (tested on 2.1.2.0)

CentOS (v7) hosts (be it, AWS, GCP or DigitalOcean etc.)

Vagrant (thanks @xenithorb)

Installation

Setup 3 vanilla CentOS machines with your chosen provider (I'm using DigitalOcean).

1x master 2x nodes

In your inventory place the IP addresses you intend to use.

Now you can provision your K8s cluster with:

ansible-playbook create-cluster-playbook.yml -b --user=root

Verification

To check if everything has provisioned correctly, on your master node, invoke:

kubectl get nodes

This will output all the nodes connected in the cluster:

NAME                 STATUS    AGE
centos-2gb-lon1-01   Ready     24m
centos-2gb-lon1-02   Ready     24m
centos-2gb-lon1-03   Ready     25m

To check the pod network is running correctly, invoke:

kubectl get pods --all-namespaces

You should see:

NAMESPACE     NAME                                         READY     STATUS    RESTARTS   AGE
kube-system   etcd-centos-2gb-lon1-03                      1/1       Running   0          27m
kube-system   kube-apiserver-centos-2gb-lon1-03            1/1       Running   0          28m
kube-system   kube-controller-manager-centos-2gb-lon1-03   1/1       Running   0          27m
kube-system   kube-discovery-982812725-ark01               1/1       Running   0          27m
kube-system   kube-dns-2247936740-s4zgc                    3/3       Running   0          27m
kube-system   kube-proxy-amd64-26tjw                       1/1       Running   0          27m
kube-system   kube-proxy-amd64-3n8dn                       1/1       Running   0          27m
kube-system   kube-proxy-amd64-kh8lo                       1/1       Running   0          27m
kube-system   kube-scheduler-centos-2gb-lon1-03            1/1       Running   0          26m
kube-system   weave-net-25wpd                              2/2       Running   0          27m
kube-system   weave-net-akgjx                              2/2       Running   0          27m
kube-system   weave-net-fc4or                              2/2       Running   0          27m

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