Setting up Kubernetes cluster

This article describes a way to deploy a Kubernetes cluster on a few CentOS 7 machines.

Prerequisites

Every system should have:

• CentOS 7 minimal installed
• firewalld stopped

systemctl stop firewalld; systemctl disable firewalld

• ntpd installed and running:

yum -y install ntpd && systemctl start ntpd && systemctl enable ntpd

Master installation

To install a master node, you need to do the following:

Install etcd and kubernetes-master

yum -y install etcd kubernetes-master

Configure etcd

Make sure /etc/etcd/etcd.conf contains this line:

ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"

Configure Kubernetes API server

Make sure /etc/kubernetes/apiserver contains this:

4. Start master node services:

for S in etcd kube-apiserver kube-controller-manager kube-scheduler; do 
  systemctl restart $S
  systemctl enable $S
done

Set nodes (minions)

1. Install vzkernel:

rpm -ihv https://download.openvz.org/virtuozzo/factory/x86_64/os/Packages/v/vzkernel-3.10.0-229.7.2.vz7.6.9.x86_64.rpm

2. Enable docker-ploop repo:

cd /etc/yum.repos.d/
wget https://copr.fedoraproject.org/coprs/kir/docker-ploop/repo/epel-7/kir-docker-ploop-epel-7.repo
echo "priority=60" >> kir-docker-ploop-epel-7.repo
yum install ploop docker

3. Set ploop driver to be default for docker.

Make sure /etc/sysconfig/docker-storage contains:

DOCKER_STORAGE_OPTIONS="-s ploop"

4. Install flannel and kubernetes-node:

yum -y install flannel kubernetes-node

See also

• etcd configuration