Distributed Jenkins

Notes on the Jenkins Deployment for Scalability around Pull Requests from GitHub.

1. on master:

Generate an id_rsa key, for example:

 ssh-keygen -t rsa -C "The access key for Jenkins slaves" 

make sure the chmod's are right copy the public key

Important:

This is all based on the key under /var/lib/jenkins/.ssh/  being with the following owner and access permissions:
  -rw-------.  1 jenkins jenkins 1675 Dec 21 21:20 id_rsa
  -rw-r--r--.  1 jenkins jenkins  419 Dec 21 21:20 id_rsa.pub

(see credentials below based on file)

1. on slave

copy the public key (id_rsa.pub) into 
.ssh/authorized_keys
make sure the chmod is 600, as in:
-rw-------. 1 jenkins jenkins  831 Dec 21 23:05 authorized_keys

Note: Make sure in the copy you have one line for the copy. Sometimes, copying may break the key into multiple lines.

1. In AWS console / the master and slave nodes:

 Open the 22 ports to and from the two systems. 

1. On slave:

On your master machine go to Manage Jenkins > Manage Nodes.