install-docker-rhel.yaml

---
#
# Install docker and then start and enable it.
#
# NOTE: As of ICP v2.1.0.2 on RHEL it is required that Docker
# available in Passport Advantage (or) eXtreme Leverage is used.
# The install package is an executable binary.
# It has a pre-req that may not be installed already: policycoreutils-python
#
# NOTE: This playbook assumes the Docker install executable is located
# in /root/docker and named icp-docker-install.bin of the localhost when the
# script is run.
#
# NOTE: Check the name of the docker install executable.  It is hard-wired
# in the script below.
#
# NOTE: Ubuntu uses overlay2 by default.  Centos and RHEL do not.  The storage driver
# is explicitly included on the ExecStart line of the docker.service file for clarity.
#
# NOTE: The MountFlags=shared is also explicitly included in the docker.service file
# for clarity.  It could be left out all together.
#
# INPUTS:
#   vars:
#     target_nodes - a regex string or group name that defines the hosts or
#                    host group.
#
#     You can define the vars on the ansible-playbook command line using --extra-vars.
#     Or define vars in your hosts inventory or any of the other ways to define
#     Ansible variables.
#     The --inventory option can be used to provide a path to an inventory file
#     on the ansible-playbook command line.
#
# Root privilege is needed to run this configuration script.
# The tasks where root is needed use the "become" option.
#
# Sample invocation:
#   ansible-playbook install-docker.yaml --extra-vars "target_nodes=worker0*"
#
#   The above invocation assumes the ansible hosts file has nodes with
#   names that start with worker0, e.g., worker01, worker02, ...
#
#
- hosts: "{{ target_nodes }}"
  tasks:

  - name: "Create destination directory for Docker install executable"
    file:
      path: /root/docker
      state: directory
      owner: root
      group: root
    become: True

  - name: "Copy Docker executable to host"
    copy:
      src: /root/docker/icp-install-docker.bin
      dest: /root/docker/icp-install-docker.bin
      mode: u=rx,g=rx,o=rx
    become: True

  - name: "Install Docker"
    shell: ./icp-install-docker.bin --install
    args:
      chdir: /root/docker
      creates: /usr/bin/docker
    become: True

  - name: "Configure the logging options"
    lineinfile:
      dest: /lib/systemd/system/docker.service
      backrefs: True
      regexp: '^(ExecStart=/usr/bin/dockerd(?!.*[ \t]--log-opt max-size=10m --log-opt max-file=10[ \t\n]).*)$'
      line: '\1 --log-opt max-size=10m --log-opt max-file=10'
      state: present
    become: True

  - name: "Use overlay2 storage driver"
    lineinfile:
      dest: /lib/systemd/system/docker.service
      backrefs: True
      regexp: '^(ExecStart=/usr/bin/dockerd(?!.*[ \t]--storage-driver=overlay2[ \t\n]).*)$'
      line: '\1 --storage-driver=overlay2'
      state: present
    become: True

  - name: "Set MountFlags=shared"
    lineinfile:
      dest: /lib/systemd/system/docker.service
      line: MountFlags=shared
      insertafter: StartLimitInterval=*
      state: present
    become: True

  - name: "Do a systemd daemon-reload to reload of changes to docker service file"
    systemd:
      daemon-reload: yes
    become: True

  - name: "Start and enable Docker service"
    service:
      name: docker
      state: started
      enabled: yes
    become: True