---

# See https://docs.openshift.com/container-platform/3.9/install_config/install/host_preparation.html

- name: Prepare hosts for an OpenShift 3.9 installation
  hosts: OSEv3
  become: yes
  vars:
    ocp_version: 3.9
    docker_version: 1.13.1

  tasks:
  - name: Set net.ipv4.ip_forward = 1
    sysctl:
      name: net.ipv4.ip_forward
      value: 1
      state: present
      reload: yes
    register: ip_forward
    tags: network

  - name: Reboot if the ip_forward state has changed
    shell: 'sleep 5 && /sbin/shutdown -r now "reboot triggered by Ansible"'
    async: 1
    poll: 0
    when: ip_forward.changed
    tags: network

  - name: Wait for the reboot to complete
    wait_for_connection:
      connect_timeout: 20
      sleep: 5
      delay: 5
      timeout: 300
    when: ip_forward.changed
    tags: network

  - name: Read the current value of net.ipv4.ip_forward
    command: sysctl -n net.ipv4.ip_forward
    changed_when: false
    register: sysctl
    tags: network

  - name: Uninstall things that might interfere with DNS
    yum:
      name: '{{ item }}'
      state: absent
    with_items:
    - nscd
    - bind
    - bind-chroot
    tags: rpm,dns

  - name: Make sure iproute is installed (provides the "ss" command)
    yum: 
      name: iproute
      state: installed
    tags: rpm,dns

  - name: Check who is listening on port 53
    command: ss -tuplnH sport = :53
    changed_when: false
    register: ss
    tags: dns
  
  - name: Make sure no one is listening on port 53
    assert:
      that:
      - 'port_53_listeners|int == 0'
      msg: >
        You have something listening on port 53. This will collide with dnsmasq
        that comes with OpenShift. Please inspect and fix this !
    vars:
      port_53_listeners: '{{ ss.stdout_lines|length }}'
    tags: dns

  - name: Check that net.ipv4.ip_forward = 1
    assert:
      that:
      - ip_forward_value == '1'
      msg: >
        The sysctl variable 'net.ipv4.ip_forward' needs to be enabled.
        If you stumbled on this message, there is a high chance you have this
        setting hardcoded somewhere. You will have to change it by yourself
        and re-run this playbook.
    vars:
      ip_forward_value: '{{ sysctl.stdout_lines[0] }}'
    tags: network

  - name: Check if /etc/kubernetes exists
    stat:
      path: /etc/kubernetes
    register: etc_kubernetes
    tags: checks

  - name: Check if /etc/cni exists
    stat:
      path: /etc/cni
    register: etc_cni
    tags: checks

  - name: Check if there is an old version of Kubernetes installed
    assert:
      that:
      - "'KUBE_CONFIG' not in ansible_env"
      - "not etc_kubernetes.stat.exists"
      - "not etc_cni.stat.exists"
      msg: An old installation of Kubernetes may have been found
    tags: checks

  - name: Make sure SELinux is enabled
    lineinfile:
      path: /etc/sysconfig/selinux
      line: 'SELINUX=enforcing'
      regexp: '^ *SELINUX='
      state: present
    register: selinux
    tags: selinux

  - name: Reboot if SELinux state has changed
    shell: 'sleep 5 && /sbin/shutdown -r now "reboot triggered by Ansible"'
    async: 1
    poll: 0
    when: selinux.changed
    tags: selinux

  - name: Waiting for server(s) to come back
    wait_for_connection:
      connect_timeout: 20
      sleep: 5
      delay: 5
      timeout: 300
    when: selinux.changed
    tags: selinux

  - name: Install the required software
    yum:
      name: '{{ item }}'
      state: installed
    with_items:
    - wget
    - git
    - net-tools
    - bind-utils
    - iptables-services
    - bridge-utils
    - bash-completion
    - kexec-tools
    - sos
    - psacct

  - name: Install some optional software
    yum:
      name: '{{ item }}'
      state: installed
    with_items:
    - vim-enhanced
    - tmux
    - unzip
    - tcpdump
    - telnet
    - strace
    - man-pages
    - man
    - iptraf
    - wget
    - openssh-clients
    - httpd-tools
    - net-tools
    - nfs-utils
    - yum-utils
    - openldap-clients
    tags: rpm

  - name: Install NetworkManager
    yum:
      name: NetworkManager
      state: installed
    tags: rpm,NetworkManager

  - name: Make sure NetworkManager is enabled
    service:
      name: NetworkManager
      state: started
      enabled: yes
    tags: rpm,NetworkManager

  - name: Make sure the system is up-to-date
    yum:
      name: '*'
      state: latest
    tags: rpm

  - name: First, disable any repos (using subscription-manager)
    command: subscription-manager repos --disable="*"
    tags: rpm

  - name: Make sure mandatory repos are enabled
    command: subscription-manager repos --enable {{ item }}
    with_items:
      - rhel-7-server-rpms
      - rhel-7-server-extras-rpms
      - rhel-7-server-ose-{{ ocp_version }}-rpms
      - rhel-7-fast-datapath-rpms # see https://access.redhat.com/solutions/3008401
      - rhel-7-server-ansible-2.4-rpms
    tags: rpm

  - name: Install Docker
    yum:
      name: 'docker-{{ docker_version }}'
      state: installed
    tags: rpm,docker

  - name: Find the filesystem hosting /var/lib/docker
    command: df -k /var/lib/docker
    register: df
    changed_when: false
    tags: docker

  - name: Make sure the filesystem hosting /var/lib/docker is formatted as XFS
    assert:
      that:
      - 'docker_filesystem == ''xfs'''
      msg: "The filesystem holding /var/lib/docker must be formatted as XFS"
    vars:
      docker_mount_point: '{{ df.stdout_lines[1].split()[5] }}'
      # TODO: replace match with "equalto" as soon as the Jinja shipped with RHEL is updated
      docker_filesystem: '{{ ansible_mounts|selectattr(''mount'', ''match'', ''^'' ~ docker_mount_point ~ ''$'')|map(attribute=''fstype'' )|first }}'
    tags: docker
      
  - name: Stop Docker
    service:
      name: docker
      state: stopped
      enabled: yes
    tags: docker

  - name: Make sure overlayfs is enabled
    lineinfile:
      path: /etc/sysconfig/docker-storage
      line: 'DOCKER_STORAGE_OPTIONS="--storage-driver overlay2"'
      regexp: '^ *DOCKER_STORAGE_OPTIONS='
      state: present
    register: docker_storage
    tags: docker

  - name: Cleanup the Docker local storage
    file:
      path: /var/lib/docker
      state: absent
    tags: docker
    when: docker_storage.changed

  - name: Start Docker
    service:
      name: docker
      state: started
      enabled: yes
    tags: docker

  - name: Install atomic-openshift-utils
    yum:
      name: atomic-openshift-utils
      state: installed
    tags: rpm,openshift