概要

Ansibleを使ってfluent-bitをRaspberryPiにインストールします。

プレイブックとテンプレート

マニュアルに書かれている通り、GPG鍵を登録してapt経由でインストールします。

fluent-bit.yaml

- name: Setup fluent-bit 
  hosts: all
  become: true
  gather_facts: false
  tasks:
    - name: Add fluent-bit server’s GPG key
      ansible.builtin.apt_key:
        url: https://packages.fluentbit.io/fluentbit.key 
        state: present

    - name: Add fluent-bit repository into the sources list
      ansible.builtin.apt_repository:
        repo: deb https://packages.fluentbit.io/raspbian/bullseye bullseye main
        state: present

    - name: Install fluent-bit
      ansible.builtin.apt:
        name: fluent-bit
        update_cache: true

    - name: Upload a configuration file
      ansible.builtin.template:
        src: fluent-bit.conf.j2 
        dest: /etc/fluent-bit/fluent-bit.conf
        mode: "0644" 
      notify:
        - config is updated

  handlers:
    - name: Restart fluent-bit
      ansible.builtin.systemd:
        name: fluent-bit
        state: restarted 
      listen:
        - config is updated

  post_tasks:
    - name: Ensure fluent-bit is enabled and started
      ansible.builtin.systemd:
        name: fluent-bit 
        state: started
        enabled: true

設定ファイルのテンプレート下記の通りです。タグにホスト名を追加しています。

templates/fluent-bit.conf.j2 

[SERVICE]
    # Daemon
    # ======
    # instruct Fluent Bit to run in foreground or background mode.
    #
    daemon       Off

[INPUT]
    name cpu
    tag  {{ inventory_hostname_short }}.cpu
    # Read interval (sec) Default: 1
    interval_sec 1

[OUTPUT]
    name  stdout
    match *

参考

Raspbian / Raspberry Pi - Fluent Bit: Official Manual