使用Ansible在Debian/Ubuntu上安装最新的Prometheus Node Exporter

我尝试在Ubuntu上安装node exporter，但是使用apt install prometheus-node-exporter无法安装最新的node exporter。为了安装最新的node exporter，需要从GitHub上下载二进制文件。

由于检查最新版本很麻烦，所以我创建了一个用于安装最新版本的Ansible playbook。

(2023/8/8时刻，使用apt install命令安装的版本是1.5.0。在GitHub上的最新发布版本是1.6.1。)

我按照以下页面的手顺进行了Prometheus Node Exporter的设置。

---
- name: groupadd -f --system node_exporter
  ansible.builtin.group:
    name: node_exporter
    state: present
    system: true

- name: useradd -g node_exporter --no-create-home --shell /bin/false node_exporter
  ansible.builtin.user:
    name: node_exporter
    group: node_exporter
    state: present
    shell: /bin/false
    create_home: false
    system: true

- name: mkdir -p /etc/node_exporter; chown node_exporter:node_exporter /etc/node_exporter
  ansible.builtin.file:
    path: /etc/node_exporter
    state: directory
    owner: node_exporter
    group: node_exporter
    mode: 0755

- name: Read GitHub API (latest release info)
  ansible.builtin.uri:
    url: https://api.github.com/repos/prometheus/node_exporter/releases/latest
  register: _result_response

- name: set_fact `_tag_name`
  ansible.builtin.set_fact:
    _tag_name: "{{ _result_response.json['tag_name'] }}"

- name: node_exporter - set `_dict_file_name`
  ansible.builtin.set_fact:
    _dict_file_name:
      x86_64: "node_exporter-{{ _tag_name | regex_replace('^v?(.*)$', '\\1') }}.linux-amd64"
      aarch64: "node_exporter-{{ _tag_name | regex_replace('^v?(.*)$', '\\1') }}.linux-arm64"

- name: Show the value of `_dict_file_name`
  ansible.builtin.debug:
    var: _dict_file_name

- name: Unarchive `node_exporter-${VERSION}.linux-<ARCH>.tar.gz` and save it in `/tmp`
  ansible.builtin.unarchive:
    remote_src: yes
    src: "\
      https://github.com/prometheus/node_exporter/releases/download/\
      {{ _tag_name }}/{{ _dict_file_name[ansible_architecture] }}.tar.gz"
    dest: /tmp

- name: Copy `/tmp/node_exporter-${VERSION}.linux-<ARCH>./node_exporter` to `/usr/bin/node_exporter`
  ansible.builtin.copy:
    remote_src: yes
    src: "/tmp/{{ _dict_file_name[ansible_architecture] }}/node_exporter"
    dest: /usr/bin/node_exporter
    owner: node_exporter
    group: node_exporter
    mode: +x

- name: Copy `./node_exporter.service` to `/usr/lib/systemd/system/node_exporter.service`
  ansible.builtin.copy:
    remote_src: no
    src: "{{ playbook_dir }}/tasks/node_exporter.service"
    dest: /usr/lib/systemd/system

- name: systemctl daemon-reload; systemctl enable --now node_exporter.service
  ansible.builtin.systemd:
    name: node_exporter.service
    daemon_reload: true
    scope: system
    state: started
    enabled: yes

- name: rm -r "/tmp/node_exporter-${VERSION}.linux-<ARCH>
  ansible.builtin.file:
    path: "/tmp/{{ _dict_file_name[ansible_architecture] }}/"
    state: absent

[Unit]
Description=Node Exporter
Documentation=https://prometheus.io/docs/guides/node-exporter/
Wants=network-online.target
After=network-online.target

[Service]
User=node_exporter
Group=node_exporter
Type=simple
Restart=on-failure
ExecStart=/usr/bin/node_exporter

[Install]
WantedBy=multi-user.target