okd-installation-centos

About...

This repository is used to create OKD 3.11 Cluster with 9 simple steps on Bare VM's

Table of Contents

• What are the pre-requisites ?
• What are the VM's provisioned ?
• How to deploy okd cluster ?
• How to access okd Console ?
• What are the addons provided ?

What are the prerequisites ?

• Git

What are the VM's provisioned ?

Note: We are not going to create any VM's during this process. User is expected to have VM's before proceeding with this repository

Below is the example configuration that we are going to refer through out this repository.

Name	IP	OS	RAM	CPU
okd-master-node	100.10.10.100	CentOS7	16GB	4
okd-worker-node-1	100.10.10.101	CentOS7	16GB	4
okd-worker-node-2	100.10.10.102	CentOS7	16GB	4
okd-worker-node-3	100.10.10.103	CentOS7	16GB	4
okd-infra-node-1	100.10.10.104	CentOS7	16GB	4

How to deploy openshift cluster ?

Step 1

Update the system and host names for all nodes

• 100.10.10.100 (okd-master-node)
• 100.10.10.101 (okd-worker-node-1)
• 100.10.10.102 (okd-worker-node-2)
• 100.10.10.103 (okd-worker-node-3)
• 100.10.10.104 (okd-infra-node-1)

Unix Command!!!

$ yum update -y

$ nano /etc/hostname (OR) $ nmtui

Step 2

Enable SELINUX=enforcing on all master/worker/infra nodes

• 100.10.10.100 (okd-master-node)
• 100.10.10.101 (okd-worker-node-1)
• 100.10.10.102 (okd-worker-node-2)
• 100.10.10.103 (okd-worker-node-3)
• 100.10.10.104 (okd-infra-node-1)

Unix Command!!!

$ nano /etc/selinux/config

We can verify the status by running the below command. The correct status will not reflect once we changed until we reboot the machines

$ sestatus

Step 3

Reboot all master/worker/infra nodes

• 100.10.10.100 (okd-master-node)
• 100.10.10.101 (okd-worker-node-1)
• 100.10.10.102 (okd-worker-node-2)
• 100.10.10.103 (okd-worker-node-3)
• 100.10.10.104 (okd-infra-node-1)

Unix Command!!!

$ reboot

Step 4

Checkout the code (git clone https://github.com/SubhakarKotta/okd-installation-centos.git)

Configure okd-installation-centos/provisioning/settings.sh file

Step 5

Copy "okd-installation-centos" folder to all master/worker nodes

• 100.10.10.100 (okd-master-node)
• 100.10.10.101 (okd-worker-node-1)
• 100.10.10.102 (okd-worker-node-2)
• 100.10.10.103 (okd-worker-node-3)
• 100.10.10.104 (okd-infra-node-1)

Example copy to root folder and execution permissions can be applied by executing the below command.

Unix Command!!!

$ chmod +x -R okd-installation-centos

Step 6

Execute the below script on all master/worker/infra nodes

• 100.10.10.100 (okd-master-node)
• 100.10.10.101 (okd-worker-node-1)
• 100.10.10.102 (okd-worker-node-2)
• 100.10.10.103 (okd-worker-node-3)
• 100.10.10.104 (okd-infra-node-1)

Unix Command!!!

$ okd-installation-centos/provisioning/install_prerequisites.sh

Step 7

Enable SSH to communicate all the other "worker/infra nodes" from "master" with out "password". All the below commands needs to be executed on "master" node only

• 100.10.10.101 (okd-master-node)

Unix Command!!!

$ ssh-keygen -t rsa

okd-master-node

$ cat ~/.ssh/id_rsa.pub | ssh root@100.10.10.100 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

okd-worker-node-1

$ cat ~/.ssh/id_rsa.pub | ssh root@100.10.10.101 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

okd-worker-node-2

$ cat ~/.ssh/id_rsa.pub | ssh root@100.10.10.102 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

okd-worker-node-3

$ cat ~/.ssh/id_rsa.pub | ssh root@100.10.10.103 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

okd-infra-node-4

$ cat ~/.ssh/id_rsa.pub | ssh root@100.10.10.104 "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys"

Step 8

Execute the below script only on master node

• 100.10.10.101 (okd-master-node)

Unix Command!!!

$ okd-installation-centos/provisioning/install_master.sh

Step 9

Verify okd installation is success by executing below two commands to see all the nodes and pods.

Unix Command!!!

$ oc login -u admin -p admin https://console.okd.nip.io:8443

$ oc get projects

How to access okd Console ?

The okd Console can be accessed via the below URL from your local machine

https://console.okd.nip.io:8443

What are the addons provided ?

• helm