How to create a new Jenkins slave

So you have your master instance of Jenkins all set up and now you want to let your slave instances of Jenkins work for you?

Here are a few things to do before being able to use them:

1. Create a user jenkins with: adduser jenkins
2. Add your master instance ssh public key to the file /home/jenkins/.ssh/authorized_keys
   It can be as simple as this command: ssh-copy-id -i ~/.ssh/mykey user@host
Remember that the master should be able to connect to your slave without any password.
3. Install java with: apt install default-jre

If you plan on using Docker:

• Install Docker (https://docs.docker.com/install/)

Make sure docker runs at startup with: systemctl enable docker and add jenkins user to the docker group: user mod -aG docker jenkins

• Install docker-compose if you plan on using it also

Add a new node to your master instance of Jenkins

Go to Jenkins →Manage Jenkins →Manage Nodes →New node and fill in the different fields as below. Adapt it to your needs:

Et voila !

Now in your Jenkinsfile use the agent with the label php for example and admire your new slave working for you :)