Jenkins master/agent

Create another VPS and ssh to it
Create user bob: adduser bob
Create ssh public key of the Jenkins user ssh-keygen copy /var/lib/jenkins/.ssh/id_rsa.pub from the Jenkins server to /home/bob/.ssh/authorized_keys on the machine that will be used as an agent and then chown -R bob.bob /home/bob/.ssh/
Verify that user jenkins can ssh to user bob on the agent machine without supplying any password.
If No entry currently exists in the Known Hosts file for this host: Run this as user jenkins on the master:
ssh-keyscan -H 107.170.12.117 >> ~/.ssh/known_hosts
Remote home directory: /home/bob
Launch method: via SSH
SSH Username with private key
Username: bob
Private Key: From the Jenkins master ~/.ssh

Manage Jenkins
    Manage nodes
       New node, Node name: s1   - Permanent Agent

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