ansible: jenkins-swarm client

gistfile1.txt

You first need to install the Swarm plugin as mentioned https://wiki.jenkins-ci.org/display/JENKINS/Swarm+Plugin.
Then you can proceed with the client installation.

First create the jenkins slave working directory.

- name: Create Jenkins slave directory
  file: path=${jenkins_home}/jenkins-slave state=directory owner=jenkins

Download the Swarm Client.

- name: Download Jenkins Swarm Client
  get_url: dest=${jenkins_home}/swarm-client-1.8-jar-with-dependencies.jar url=http://maven.jenkins-ci.org/content/repositories/releases/org/jenkins-ci/plugins/swarm-client/1.8/swarm-client-1.8-jar-with-dependencies.jar owner=jenkins

When you start the swarm client, it will connect to the master and the master will automatically create a new node for it.
There are a couple of parameters to start the client. You still need to provided a login/password in order to authenticate. You obviously want this information to be parameterizable.

First we need a script/configuration to start the swarm client at boot time (systemv, upstart or systemd it is up to you). In that script/configuration, you need to add the swarm client run command:

java -jar {{jenkins_home}}/swarm-client-1.8-jar-with-dependencies.jar -name {{jenkins_slave_name}} -password {{jenkins_password}} -username {{jenkins_username}} -fsroot {{jenkins_home}}/jenkins-slave -master https://jenkins.trifork.nl -disableSslVerification &> {{jenkins_home}}/swarm-client.log &

Then using the template module http://ansible.cc/docs/modules.html#template, to process the script/configuration template (using Jinja2 http://jinja.pocoo.org/docs/) into a file that will be put on a given location.

- name: Install swarm client script
  template: src=templates/jenkins-swarm-client.tmpl dest=/etc/init.d/jenkins-swarm-client mode=0700

The file mode is 700 because we have a login/password in that file, we don’t want people (that can log on the remote computer) to be able to see that.

Instead of putting jenkins_username and jenkins_password in vars files, you can prompt for them.

vars_prompt:

  - name: jenkins_username
    prompt: "What is your jenkins user?"
    private: no
  - name: jenkins_password
    prompt: "What is your jenkins password?"
    private: yes

And then you can verify that they have been set.

- fail: msg="Missing parameters!"
  when_string: $jenkins_username == '' or $jenkins_password == ''

You can now start the swarm client using the service module and enable it to start at boot time.

- name: Start Jenkins swarm client
  action: service name=jenkins-swarm-client state=started enabled=yes


http://blog.trifork.com/2013/04/02/ansible-example-playbook-to-setup-jenkins-slave/