Master-Slave on AWSEC2

Video of the steps at : vimeo.com/485164578

Log in to  AWS Console
Search for EC2 

Setting up Jenkins Master
-------------------------
Create  new instance
  - in security group, choose all & any for inbound connections
download new keypair and change its permissions chmod 400 JenkTest.pem
Connect via ssh:
  - ssh -i "JenkTest.pem" ubuntu@ec2-54-91-219-70.compute-1.amazonaws.com
Once connected to EC2 via SSH 
sudo apt-get update
sudo apt install openjdk-8-jre (install Java)
Steps to install Jenkins https://pkg.jenkins.io/debian-stable/
sudo service jenkins start
<externalipofec2instance>:8080
Set up Jenkins

Setting up Slave
-------------------------
Create  new instance
  - in security group, choose all & any for inbound connections
use same key pair as before
Connect via ssh:
  - ssh -i "JenkTest.pem" ubuntu@ec2-54-81-212-70.compute-1.amazonaws.com
Once connected to EC2 via SSH 
  - sudo apt-get update
  - sudo apt install openjdk-8-jre (install Java)
  - create a ssh key using ssh-keygen -t rsa -N "" -f /home/ubuntu/.ssh/id_rsa
  - cd .ssh
  - cat id_rsa.pub > authorized_keys
  - chmod 700 authorized_keys
  - run cat  id_rsa -> copy output in a plain text editor

In Jenkins-Master
 On Master Node
    - mkdir -p /var/lib/jenkins/.ssh
    - cd /var/lib/jenkins/.ssh
    - sudo touch known_hosts
    - vi known_hosts
    - ssh-keyscan -H <PVT-IP-OF-SLAVENODE>
    - copy output of above command and past it into vi (where you have opened known_hosts). Save and close
    - sudo chown jenkins:jenkins known_hosts
   - sudo chmod 700 known_hosts
in Jenkins: Manage Jenkins-Nodes & Cloud -New Node
  - give it a name
  - Choose permanent
  - give a description
  - remote root dir: /home/ubuntu
  - give a label
  - launch method - USe SSH
  - Host - Slave node's private IP
  - Credentials: Add Jenkins Credential
    - Kind: SSH Username & private key
    - user: ubuntu
    - private key: select enter directly
      - copy & paste output from line 35 here
      - click on add
    - now you can select this newly added credential back in the previous screen
    - save
  - click on node and make sure it is running
 
 on master create a freestyle job and choose "restrict where this project can be run" and enter slave node name
 build now