Prepare_Workshop/prepare_lxc_hosts.yml

---
- hosts:
  - lxc_hosts

  tasks:
    - assert:
        that:
          - ansible_pkg_mgr == "apt"
        fail_msg: "Sorry, Debian-like hosts only!"


    - name: Just to be sure python3-apt is installed
      command: apt install -y python3-apt
      args:
        creates: /usr/lib/python3/dist-packages/apt


    - name: Install packages
      package:
        name: "{{ packages }}"
        state: latest
      vars:
        packages:
          - bridge-utils
          - dnsmasq
          - iptables
          - lxc
          - python3-lxc


    - name: Copy config files
      copy:
        src: "{{ item }}"
        dest: "/{{ item }}"
        owner: root
        group: root
        mode: 0644
      loop:
        - etc/dnsmasq.d/br-lxc
        - etc/lxc/ansible.conf
        - etc/network/interfaces.d/br-lxc
      notify:
        - Restart dnsmasq



    - name: Fix evil Debian default /etc/network/interfaces
      lineinfile:
        dest: /etc/network/interfaces
        regexp: 'source.*interfaces.d'
        line: 'source-directory /etc/network/interfaces.d'
        backup: yes


    - name: dnsmasq should use /etc/resolv.conf
      lineinfile:
        path: /etc/default/dnsmasq
        line: 'IGNORE_RESOLVCONF=yes'
        regexp: '^\s*#*\s*IGNORE_RESOLVCONF=yes'
        backup: yes
      notify:
        - Restart dnsmasq


    - name: IPv4-Forwarding
      sysctl:
        name: net.ipv4.ip_forward
        value: '1'
        sysctl_file: /etc/sysctl.d/lxc.conf
        sysctl_set: yes
        state: present
        reload: yes


    - name: Raise inotify limit
      sysctl:
        name: fs.inotify.max_user_instances
        value: '1024'
        sysctl_file: 30-lxc-inotify.conf
        sysctl_set: yes
        state: present
        reload: yes


    - name: Enable CAP_SYS_TIME in Container
      lineinfile:
        dest: /usr/share/lxc/config/common.conf
        backrefs: yes
        regexp: '(^\s*[^#].*)sys_time ?(.*)$'
        line: '\1\2'
        backup: yes


    - name: lxc-net with systemd
      block:
        - name: Stop lxc-net service
          systemd:
            name: lxc-net
            state: stopped

        - name: Disable lxc-net service
          systemd:
            name: lxc-net
            enabled: no

        - name: Mask lxc-net service
          systemd:
            name: lxc-net
            masked: yes
      when: ansible_service_mgr == "systemd"


    - name: lxc-net without systemd
      block:
        - name: Disable lxc-net
          service:
            name: lxc-net
            enabled: no
            state: stopped
          ignore_errors: yes
      when: ansible_service_mgr != "systemd"


    - name: Bring up br-lxc
      command: ifup br-lxc
      args:
        creates: /sys/devices/virtual/net/br-lxc



  handlers:
    - name: Restart dnsmasq
      service:
        name: dnsmasq
        state: restarted
      ignore_errors: yes