lxc_post_install.yml

---
# Copyright 2016, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

- name: Ensure the lxc dnsmasq user exists
  user:
    name: "{{ lxc_net_dnsmasq_user }}"
    comment: "LXC dnsmasq"
    system: "yes"
    shell: "/bin/false"
    home: "/var/lib/lxc"
  tags:
    - lxc-dnsmasq-user

- name: Drop base config file(s)
  template:
    src: "{{ item.src }}"
    dest: "{{ item.dest }}"
    owner: "{{ item.owner|default('root') }}"
    group: "{{ item.group|default('root') }}"
    mode: "{{ item.mode|default('0644') }}"
  with_items:
    - { src: lxc-openstack.conf.j2, dest: "/etc/lxc/lxc-openstack.conf" }
    - { src: lxc-net.default.j2, dest: "{{ system_config_dir }}/lxc-net", mode: "0644" }
    - { src: lxc.default.j2, dest: "{{ system_config_dir }}/lxc", mode: "0644" }
    - { src: lxc-system-manage.j2, dest: "/usr/local/bin/lxc-system-manage", mode: "0755" }
  tags:
    - lxc-files
    - lxc-config

- name: Pull lxc version
  command: "lxc-ls --version"
  changed_when: false
  register: lxc_version
  tags:
    - skip_ansible_lint

- name: Enable or Disable lxc three syntax
  set_fact:
    lxc_major_version: "{{ lxc_version.stdout.split('.')[0] }}"

- name: Create machinectl base template
  template:
    src: "lxc-machinectl.j2"
    dest: "/usr/share/lxc/templates/lxc-machinectl"
    owner: "root"
    group: "root"
    mode: "0755"

- name: Drop lxc veth check script
  copy:
    src: "lxc-veth-check.sh"
    dest: "/usr/local/bin/lxc-veth-check"
    owner: "root"
    group: "root"
    mode: "0755"
  tags:
    - lxc-files
    - lxc-config

- name: Set systemd DefaultTasksMax value
  lineinfile:
    dest: /etc/systemd/system.conf
    state: present
    regexp: "^.*DefaultTasksMax.*$"
    line: "DefaultTasksMax={{ lxc_default_tasks_max }}"
  when:
    - ansible_service_mgr == 'systemd'
  notify:
    - Reload systemd units
  tags:
    - lxc-config

# NOTE(hwoarang): The previous task only affected newly created services.
# However, for particular systemd versions like v228 the default one for
# started scopes is 512
# See https://github.com/systemd/systemd/commit/9ded9cd14cc03c67291b10a5c42ce5094ba0912f
# This has later been fixed in v231
# https://github.com/systemd/systemd/commit/79baeeb96d58676853521e10a358e85d83dac7f1
# The only way to change the value for already started services and scopes is
# by using the sysfs interface. Moreover, it appears that lxc places itself into the
# init.scope group which is being created during boot and as such it always uses
# the default value. There are variours reports that the init.scope breaks things
# for LXC such as
# https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1497420
# https://github.com/lxc/lxc/issues/713
# https://bugs.archlinux.org/index.php?do=details&action=details.addvote&task_id=47303
# In any case, it's best to also edit the pids controller to ensure that a
# better max value is used in the init.scope
- name: Check that the init.scope support the pid controller
  stat:
    path: "/sys/fs/cgroup/pids/init.scope/pids.max"
  register: _init_scope_pid
  tags:
    - lxc-config

- block:
    - name: Get init.scope pids.max value
      slurp:
        src: "/sys/fs/cgroup/pids/init.scope/pids.max"
      register: init_scope_cgroup_pids_max
      changed_when: false

    # NOTE(cloudnull): The "shell" module is being used instead of "copy" with
    #                  content as we need direct write access to the sysFS.
    - name: Set systemd pids.max in init.scope
      shell: "echo {{ lxc_default_tasks_max }} > /sys/fs/cgroup/pids/init.scope/pids.max"
      when:
        - (init_scope_cgroup_pids_max.content | b64decode) != lxc_default_tasks_max
      tags:
        - skip_ansible_lint
  rescue:
    - name: Notice regarding setting the init.scope/pids.max
      debug:
        msg: |
          Failed writing to "/sys/fs/cgroup/pids/init.scope/pids.max". While
          we prefer setting this option it's not required. See the following
          issues on why this is desired and what can be done when the cgroup
          hierarchy exists.
            * https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1497420
            * https://github.com/lxc/lxc/issues/713
            * https://bugs.archlinux.org/index.php?do=details&action=details.addvote&task_id=47303
  when: _init_scope_pid.stat.exists
  tags:
    - lxc-config

# Ensure apparmor reindex runs before other things that may fail
- meta: flush_handlers