ansible-loki-role/tasks/install.yml

---
- name: create {{ loki_group }} system group
  group:
    name: "{{ loki_group }}"
    system: true
    state: present

- name: create {{ loki_user }} system user
  user:
    name: "{{ loki_user }}"
    system: true
    shell: "/usr/sbin/nologin"
    group: "{{ loki_group }}"
    createhome: false
    home: "{{ loki_storage_dir }}"

- name: create loki data directory
  file:
    path: "{{ item }}"
    state: directory
    owner: loki
    group: loki
    mode: 0755
  with_items:
    - "{{ loki_storage_dir }}"
    - "{{ loki_storage_dir }}/index"
    - "{{ loki_storage_dir }}/chunks"
  when: ('loki' in loki_bins)

- name: create loki configuration directories
  file:
    path: "{{ item }}"
    state: directory
    owner: root
    group: "{{ loki_group }}"
    mode: 0770
  with_items:
    - "{{ loki_config_dir }}"

- block:
    - name: download binaries to a temporary folder
      become: false
      get_url:
        url: "https://github.com/grafana/loki/releases/download/v{{ loki_version }}/{{ item }}-linux-{{ go_arch }}.zip"
        dest: "/tmp/{{ item }}-{{ loki_version }}-linux-{{ go_arch }}.zip"
        checksum: "sha256:{{ __loki_bins_checksum[item] }}"
      register: _download_archive
      until: _download_archive is succeeded
      retries: 5
      delay: 2
      loop: "{{ loki_bins }}"
      check_mode: false

    - name: unpack binaries
      become: false
      unarchive:
        src: "/tmp/{{ item }}-{{ loki_version }}-linux-{{ go_arch }}.zip"
        dest: "/tmp"
        creates: "/tmp/{{ item }}-{{ loki_version }}-linux-{{ go_arch }}"
      loop: "{{ loki_bins }}"
      check_mode: false

    - name: propagate official binaries
      copy:
        src: "/tmp/{{ item }}-linux-{{ go_arch }}"
        dest: "/usr/local/bin/{{ item }}"
        mode: 0755
        owner: root
        group: root
        remote_src: true
      loop: "{{ loki_bins }}"
      notify:
        - restart loki

- name: create systemd service unit
  template:
    src: "{{ item }}.service.j2"
    dest: "/etc/systemd/system/{{ item }}.service"
    owner: root
    group: root
    mode: 0644
  notify: "restart {{ item }}"
  loop: "{{ loki_bins }}"
  when: item == 'loki' or item == 'promtail'