ansible-Role角色批量按照node_export节点，并追加信息到Prometheus文件中

文章目录

剧本功能

功能1： 批量执行node_export节点，并判断操作系统，有俩份文件
功能2： 获取当前组并追加到ROle角色通用变量里面提供全部角色使用
功能3： 任务角色里面又分任务执行一个安装一个收集信息
功能：其他功能懒得总结了，大家看文章吧

inventory.yaml文件定义

[equipment:vars]  
group = "equipment" 
[equipment]
WA510-生产-设备管理09  ansible_internal_ip=xxxx  ansible_host=xxxx
WA485-生产-设备管理08  ansible_internal_ip=xxxx  ansible_host=xxxx

deploy.yaml角色定义

- name: 任务总线
  become: true
  gather_facts: yes
  hosts: oa 
  tasks:
    - name: 加载变量
      include_vars:
        file: ./vars/vars.yaml

    - name: 获取当前组名
      set_fact:
        group_name: "{{ group_names[0] }}"
      run_once: true

    - name: 生成 main.yml 文件
      lineinfile:
        path: "/root/ansible_role_k8s/init_roles/defaults/main.yml"
        regexp: '^group:'
        line: "group: {{ group_name }}"
      delegate_to: localhost  # 指定任务在本地执行
      run_once: true

    - name: 加载更新后的默认变量
      include_vars:
        file: "/root/ansible_role_k8s/init_roles/defaults/main.yml"  # 使用绝对路径
      delegate_to: localhost  # 指定任务在本地执行
      run_once: true

    - name: 执行 node_exporter 角色
      include_role:
        name: init_roles/node_exporter_lock
      when: "'node' in ansible_run_tags"
      tags: ['node']

    - name: 执行 init 角色
      include_role:
        name: init_roles/init
      when: "'ls' in ansible_run_tags"
      tags: ['ls']

/root/ansible_role_k8s/init_roles/defaults/main.yml文件如下

root@iZbp1bh3oeew2pt9bwrs4rZ:~/ansible_role_k8s/init_roles# cat ./defaults/main.yml
group: oa

node_exporter_lock角色定义

root@iZbp1bh3oeew2pt9bwrs4rZ:~/ansible_role_k8s/init_roles/node_exporter_lock# tree
.
├── files
│   ├── node_exporter
│   ├── node_exporter-1.8.1.linux-amd64.tar.gz
│   ├── node_exporter.service
│   └── 参数详解
├── handlers
│   └── main.yaml
├── tasks
│   ├── extra_tasks.yml
│   ├── main.6.5.yaml
│   ├── main.yaml
│   ├── main.yaml.bak
│   └── node_exporter_tasks.yml
└── templates
    ├── main.yml.j2
    └── prometheus_node_config.j2

4 directories, 12 files

任务角色main.yaml

- name: 执行 node_exporter 任务
  include_tasks: node_exporter_tasks.yml
  tags: ['node']

- name: 执行附加任务
  include_tasks: extra_tasks.yml
  tags: ['node']

node_exporter_tasks.yml角色

- name: 判断远程服务器有没有安装 node_exporter 服务
  shell: "pgrep -f 'node_exporter'"
  register: node_exporter_status
  ignore_errors: true
  tags: ['node']

- name: 判断远程服务器 9100 端口有没有被占用
  shell: "ss -lntp | grep ':9100'"
  register: port_status
  ignore_errors: true
  tags: ['node']

- name: 打印服务和端口占用情况
  debug:
    msg: "服务状态: {{ '存在' if node_exporter_status.rc == 0 else '不存在' }}, 端口状态: {{ '被占用' if port_status.rc == 0 else '未被占用' }}"
  tags: ['node']

- block:
    - name: 传输并解压 node_exporter 包到指定目录
      unarchive:
        src: /root/ansible_role_k8s/init_roles/node_exporter_lock/files/node_exporter-1.8.1.linux-amd64.tar.gz
        dest: /usr/local/bin/
        mode: '0755'
        remote_src: no

    - name: 判断操作系统是 CentOS 6、CentOS 7，或者 Ubuntu
      set_fact:
        os_version: "{{ ansible_distribution }} {{ ansible_distribution_major_version }}"

    - name: 传输并配置 node_exporter 服务文件（适用于 CentOS 6）
      copy:
        src: /root/ansible_role_k8s/init_roles/node_exporter_lock/files/node_exporter
        dest: /etc/init.d/node_exporter
        mode: '0755'
      when: os_version == 'CentOS 6'
      notify: 
        - Reload systemd
        - Enable and start node_exporter (CentOS 6)

    - name: 传输并配置 node_exporter systemd 服务文件（适用于 CentOS 7 和 Ubuntu）
      copy:
        src: /root/ansible_role_k8s/init_roles/node_exporter_lock/files/node_exporter.service
        dest: /etc/systemd/system/node_exporter.service
        mode: '0755'
      when: os_version != 'CentOS 6'
      notify: 
        - Reload systemd
        - Enable and start node_exporter
  when: port_status.rc == 1  # 仅当 9100 端口未被占用时执行整个 block
  tags: ['node']

- name: 记录未执行 block 任务的节点信息
  lineinfile:
    path: /var/log/ansible_node_exporter.log
    line: "Host {{ inventory_hostname }}: 服务状态: {{ '存在' if node_exporter_status.rc == 0 else '不存在' }}, 端口状态: {{ '被占用' if port_status.rc == 0 else '未被占用' }}"
  when: port_status.rc != 1  # 仅当 9100 端口被占用时执行
  delegate_to: localhost  # 在控制节点上执行，以便集中记录日志
  tags: ['node']

- name: 打印任务执行完成信息
  debug:
    msg: "任务执行完成"
  tags: ['node']

触发任务notify

main.yaml

- name: Reload systemd
  command: systemctl daemon-reload
  when: os_version != 'CentOS 6'

- name: Enable and start node_exporter
  systemd:
    name: node_exporter.service
    enabled: yes
    state: started
  when: os_version != 'CentOS 6'

- name: Enable and start node_exporter (CentOS 6)
  shell: chkconfig node_exporter on && service node_exporter start
  when: os_version == 'CentOS 6'

extra_tasks.yml角色

- name: 确保 prometheus_node 组已定义并且收集成功节点信息并去重
  assert:
    that: groups['prometheus_node'] is defined
    fail_msg: "The prometheus_node group is not defined in the inventory."
  run_once: true
  delegate_to: localhost
  tags: ['node']

- name: 收集成功节点信息
  set_fact:
    successful_nodes: "{{ groups['prometheus_node'] | map('extract', hostvars) }}"
  run_once: true
  delegate_to: localhost
  tags: ['node']

- name: 使用模板生成 Prometheus 配置片段
  template:
    src: prometheus_node_config.j2
    dest: "/tmp/prometheus_nodes_{{ lookup('pipe', 'date +%Y%m%d%H%M%S') }}.yml"
  delegate_to: localhost
  run_once: true
  tags: ['node']

- name: 在本地文件中追加成功节点信息
  shell: "cat {{ item }} >> /opt/prometheus/prometheus1.yml"
  with_fileglob:
    - "/tmp/prometheus_nodes_*.yml"
  delegate_to: localhost
  run_once: true
  tags: ['node']

prometheus_node_config.j2模板文件

{% for host in successful_nodes %}
  - targets:
    - "{{ host.ansible_host }}:9100"
    labels:
      instance: "{{ host.inventory_hostname }}-{{ host.ansible_host }}"
      namespace: '{{ namespace }}'
{% endfor %}

执行命令

ansible-playbook deploy.yaml --tags node

查看变量

root@iZbp1bh3oeew2pt9bwrs4rZ:~/ansible_role_k8s/init_roles# cat ./defaults/main.yml
group: oa

查看追加node节点信息

cat /opt/prometheus/prometheus1.yml

大概思路就是这样，需要完整Role角色的请私聊我