Minimal OpenShift cluster

occlusterup.sh

#!/bin/bash

IP_ADDR=$(ip addr |grep 172.16.252 |head -n1 |awk '{ print $2 }' |cut -d"/" -f1)

echo "${IP_ADDR}    $HOSTNAME" >> /etc/hosts
# Install Docker latest. yum-utils package is required (which provides the yum-config-manager 
# utility) in order to set up the docker stable repository. After install, we need to define 
# docker network as insecure registry to prevent failure during cluster creation.

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# Before start, please check that sysctl net.ipv4.ip_forward is set to 1.
# Install yum packages

yum install -y vim \
  curl \
  net-tools \
  bash-completion \
  yum-utils \
  lsof \
  docker-ce \
  docker-ce-cli \
  containerd.io

systemctl enable docker
systemctl start docker

echo '{"insecure-registries" : ["172.30.0.0/16"]}' >> /etc/docker/daemon.json

systemctl restart docker

# Get the OpenShift cli binary. Check for latest oc version from https://www.okd.io/download.html
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
mv ./kubectl /usr/local/bin/
chmod +x /usr/local/bin/kubectl

curl -LO https://github.com/openshift/origin/releases/download/v3.11.0/openshift-origin-client-tools-v3.11.0-0cbc58b-linux-64bit.tar.gz
tar -xvzf openshift-origin-client-tools-v3.11.0-0cbc58b-linux-64bit.tar.gz

mv openshift-origin-client-tools-v3.11.0-0cbc58b-linux-64bit/oc /usr/local/bin/
rm -rf ./openshift-origin-client-tools-v3.11.0-0cbc58b-linux-64bit

# Create an OpenShift cluster. Normally the routing suffix should point to the VIP of your infra 
# nodes where your haproxy instances run but as we have all-in-one setup here, a nip.io domain 
# that includes private IP of your server will be fine.

mkdir /opt/ocp

oc cluster up --base-dir='/opt/ocp' --public-hostname='ocp.lab.local' --routing-suffix='ocp.lab.local'