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=Systemd=
==Randomize timer==
Create '''/var/ansible/files/systemd/fstrim.conf'''
 [Timer]
 RandomizedDelaySec=3h

'''Playbook''': 

   tasks: 

      - name: check if /etc/systemd/system/fstrim.timer.d/ exists
        stat:
          path: /etc/systemd/system/fstrim.timer.d/
        register: override_dir

      - name: create /etc/systemd/system/fstrim.timer.d/
        file:
          path: /etc/systemd/system/fstrim.timer.d/
          state: directory
        when: override_dir.stat.exists == False

      - name: add fstrim.timer override
        copy:
          src: /var/ansible/files/systemd/fstrim.conf
          dest: /etc/systemd/system/fstrim.timer.d/override.conf
        notify: daemon-reload

    handlers:

      - name: daemon-reload
        systemd:
          daemon_reload: yes

=Lineinfile=
*[https://docs.ansible.com/ansible/latest/collections/ansible/builtin/lineinfile_module.html Lineinfile documentation]

==Quoting fun with lineinfile regex==
 - name: fix the needrestart config
   lineinfile:
     dest: /etc/needrestart/needrestart.conf
     state: present
     regexp: '^#\$nrconf{restart}'
     line: '$nrconf{restart} =  '&#39;a&#39;&#39;'
    when: ansible_distribution == 'Ubuntu' and ansible_distribution_major_version == '22'

==Comment out a line==
 - name: comment out a line
   lineinfile:
     dest: /etc/needrestart/needrestart.conf
     state: present
     backrefs: true
     regexp: '^(foo.*)'
     line: '# \1'


==Check for string in file==
    - name: Check for rotate setting
      lineinfile:
        path: "{{ rotatepath }}"
        regex: '^ *rotate 180$'
        state: absent
      register: result

    - debug: msg="{{ inventory_hostname }} {{ result.found }}"

=Files=
==Check if a file exists==
  - name: check for a file
    stat:
      path: /etc/fstab
    register: fstab

 - name: print message if exists
   ansible.builtin.debug:
     msg: "File /etc/fstab exists"
   when: fstab.stat.exists

=Check if a command exists=
    - name: check if mysqld is installed
      shell: which mysqld > /dev/null 2>&1 
      ignore_errors: true
      changed_when: false
      register: mysqld
      failed_when: mysqld.rc == 2

=Systemd=
==Check if systemd service exists==
 - name: check for service
     name: foo
   register: servicestate

# not-found or loaded
 - name: show status
   debug:
     var: servicestate.status.LoadState


==Check if systemd service is enabled==
 - name: check for service
     name: foo
   register: servicestate
   when: servicestate.status.LoadState == 'loaded'

 - name: show status
   debug:
     var: servicestate.status.UnitFileState







[[Category:Ansible]]