OpenShift

Install

Install Docker

You will need to google the way to get the repository

sudo apt update && sudo apt -y install docker-ce
systemctl start docker
systemctl enable docker
systemctl status docker

Set your user to user docker group

sudo usermod -aG docker $USER

Allow insecure Registry

sudo cat << EOF | sudo tee /etc/docker/daemon.json 
 {
     "insecure-registries" : [ "172.30.0.0/16" ]
 }
EOF

Restart Docker

systemctl restart docker

Get OpenShift and copy binaries

Get the package

wget 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
cd openshift-origin-client-tools-v3.11.0-0cbc58b-linux-64bit
sudo mv oc kubectl /usr/local/bin/

Make Directory

The directories are too long so we need to run the code from /opt/openshift

cp -r * /opt/openshift
cd /opt/openshift
oc cluster up  --public-hostname=your-server-ip

Fix DNS

IMPORTANT Edit the file: openshift.local.clusterup/node/node-config.yml and set dnsIP

dnsIP: "8.8.8.8"

Edit the file openshift.local.clusterup/kubedns/resolv.conf and add

nameserver 8.8.8.8
nameserver 8.8.4.4

Also make sure you have the DNS options inside the docker config file
Edit /etc/docker/daemon.json and add this but do not forget the comma if it already has something

"dns": ["8.8.8.8", "8.8.4.4"]

Start Stop Cluster

sudo oc cluster down
sudo oc cluster up

Create And Build a Project

Example 1

// Create project
oc new-project test01 --display-name="Test 01 Project" --description="My 01 Test Project Description"
// Add app
oc new-app centos/ruby-25-centos7~https://github.com/sclorg/ruby-ex.git
// Look at the logs
oc logs -f bc/ruby-ex
// Resubmit Build
oc start-build ruby-ex

Pods

OpenShift Pods contain containers. It is recommended one pod per container.

Deployment

There are 3 ways to deploy an openshift container.

• Predefined containers
  • Manual
  • Dockerfile
  • Yaml
  • Most flexible
• Openshift Application catalogue
  • Predefined application
  • Easy to deploy
  • Easy to integrate into custom applications
• Source to Image (s2i)
  • Fastest to deploy
  • Support for several programming language
  • Customizable

List of 3.1 commands

• Basic CLI Operations
  • types
  • login
  • logout
  • new-project
  • new-app
  • status
  • project
• Application Modification CLI Operations
  • get
  • describe
  • edit
  • env
  • volume
  • label
  • expose
  • delete
• Build and Deployment CLI Operations
  • start-build
  • deploy
  • rollback
  • new-build
  • cancel-build
  • import-image
  • scale
  • tag
• Advanced Commands
  • create
  • update
  • process
  • run
  • export
  • policy
  • secrets
• Troubleshooting and Debugging CLI Operations
  • logs
  • exec
  • rsh
  • rsync
  • port-forward
  • proxy

oc commands

• sudo oc login

Login so you can do stuff

• sudo oc config view

View configured clusters

• oc project

View current project

• oc status

Show status

• oc get projects

Show all projects

• oc delete project <project_name>

Deleting a project

• oc get pods

Shows the status of the pods

• oc describe pod iainapp01-1-build

Shows status of an individual pod