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---
- name: Enable cgroup via boot commandline if not already enabled
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  lineinfile:
    path: /boot/firmware/cmdline.txt
    backrefs: yes
    regexp: '^((?!.*\bcgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory\b).*)$'
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    line: '\1 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory'
  when:
    - ansible_distribution == 'Ubuntu'
- name: Read /proc/cmdline to check for cgroups already running
  shell: cat /proc/cmdline
  register: cmdline
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  when:
    - ansible_distribution == 'Ubuntu'
- name: Reboot to enable cgroups if not already running
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  reboot:
  when:
    - ansible_distribution == 'Ubuntu'
    - '"cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory" not in cmdline.stdout'