docker_jenkins.yml

- hosts: all
# docker installation for ubuntu (x64 xenial)
# Ref https://docs.docker.com/install/linux/docker-ce/ubuntu/
  tasks:
  - name: Uninstall old versions
    apt:
      name: "{{ item }}"
      state: absent
    with_items:
      - docker
      - docker-engine
      - docker.io

  - name: Install packages to allow apt to use a repository over HTTPS
    apt:
      name: "{{ item }}"
      state: present
      update_cache: yes
    with_items:
      - apt-transport-https
      - ca-certificates
      - curl
      - software-properties-common
      - python3-pip    #this one for ansible

  - name: Add Docker’s official GPG key
    apt_key: url=https://download.docker.com/linux/ubuntu/gpg

  - name: Set up the stable repository
    apt_repository:
      repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable

  - name: Install Docker CE
    apt:
      name: docker-ce
      state: present
      update_cache: yes    
# end of docker installation  
  - name: Dependency for docker_container module
    pip:
      name: docker    
# run jenkins image
# Ref https://github.com/jenkinsci/docker/blob/master/README.md
# !!Not for production!! (no admin account => unsecure)
  - name: Run Jenkins LTS image
    docker_container:
      name: jenkins
      image: jenkins/jenkins:lts
      state: started
      ports: "8080:8080"
      env:
             JAVA_OPTS: "-Djenkins.install.runSetupWizard=false"
# copy job template
  - name: Copy job template
    copy:
      src: job_template.xml
      dest: /home/vagrant/job_template.xml           
# create cron job
  - name: Add entry to cron
    cron:
      name: create jenkins job
      minute: "*/5"
      job: docker exec -i jenkins java -jar /var/jenkins_home/war/WEB-INF/jenkins-cli.jar -s http://localhost:8080/ create-job test_shell_task_$(date +\%Y\%m\%d_\%H\%M) < /home/vagrant/job_template.xml