AnsibleでRaspberry PiにPrometheus Node Exporterをインストールする

Prometheus Node Exporterでハードウェア、OS情報の収集を行います。

〇インストール方法
1.下準備
~/.ansible.cfgに以下の内容を設定します

[ssh_connection]
pipelining=True
[defaults]
host_key_checking = False

2. Prometheus Node Exporterをインストール対象のユーザやパスワードを環境に合わせてinventoryファイルに記入します

inventory例

[node-exporter]
192.168.1.16

[all:vars]
ansible_ssh_port=22
ansible_ssh_user=pi
ansible_ssh_pass=raspberry
ansible_sudo_pass=raspberry

3.inventory node-exporter-deb.ymlを準備し、以下のコマンドを実行します。
archパラメータをRaspberry Pi 3系ならarmv7、Raspberry Pi 1系ならarmv6を指定します

ansible-playbook -i inventory node-exporter.yml

node-exporter.yml

- hosts: node-exporter
  vars:
    - password: prometheus
    - arch: armv7
  tasks:
    - name: create prometheus group
      group:
        name: prometheus
      become: true
    - name: create prometheus user
      user:
        name: prometheus
        group: prometheus
        password: "{{ password | password_hash('sha512') }}"
      become: true
    - name: create prometheus directory
      file:
        path: /opt/prometheus
        state: directory
        owner: prometheus
      become: true
    - name: download prometheus node exporter
      get_url:
        url: https://github.com/prometheus/node_exporter/releases/download/v0.16.0/node_exporter-0.16.0.linux-{{ arch }}.tar.gz
        dest: /opt/prometheus/
      become: true
      become_user: prometheus
    - name: extract prometheus node exporter
      unarchive:
        remote_src: yes
        src: /opt/prometheus/node_exporter-0.16.0.linux-{{ arch }}.tar.gz
        dest: /opt/prometheus/
      become: true
      become_user: prometheus
    - name: symlink
      file:
        path: /bin/node_exporter
        state: link
        src: /opt/prometheus/node_exporter-0.16.0.linux-{{ arch }}/node_exporter
      become: true
    - name: clean up
      file:
        state: absent
        path: /opt/prometheus/node_exporter-0.16.0.linux-{{ arch }}.tar.gz
      become: yes
      become_user: prometheus
    - name: setup systemd
      blockinfile:
        dest: /etc/systemd/system/node-exporter.service
        create: yes
        block: |
          [Unit]
          Description=Prometheus Node Exporter
          Requires=network.target
          [Service]
          Restart=always
          WorkingDirectory=/opt/prometheus/node_exporter-0.16.0.linux-{{ arch }}
          ExecStart=/bin/node_exporter
          ExecReload=/bin/kill -HUP $MAINPID
          [Install]
          WantedBy=multi-user.target
      become: true
    - name: enable and start node-exporter
      systemd:
        daemon_reload: yes
        enabled: yes
        state: started
        name: node-exporter.service
      become: true

○関連情報
・Ansibleに関する他の記事はこちらを参照してください。