Linux系统下注册node exporter为systemd服务

注：这是一篇老文章，写于2018年5月31日。

目录 [](#)

add user prometheus

  1. 在root下执行以下命令，添加新用户prometheus
    useradd prometheus
    passwd prometheus
    su - prometheus
    mkdir /home/prometheus/.ssh
    cd /home/prometheus/.ssh;touch authorized_keys
  2. 将xshell存储的服务器中另外一个账号的的公钥内容写入authorized_keys
    • 在xshell中查看公钥内容的方法：xshell>工具>用户密钥管理者>选中需要的密钥>属性>公钥
  3. 修改新建用户prometheus下目录权限： chmod 0700 ~/.ssh/;chmod 0600 ~/.ssh/authorized_keys
    • 如果不修改权限，可能会遇到报错：”所选的用户密钥未在远程主机上注册“，使用root账号查看/var/log/security,看到报错 Authentication refused: bad ownership or modes for file /home/prometheus/.ssh/authorized_keys
  4. 如果在ssh配置了限制登录的用户记得在/etc/ssh/sshd_config中添加AllowUsers prometheus，然后重启ssh服务

Running Node Exporter as a Service

  1. To make it easy to start and stop Node Exporter, let us now convert it into a service.
  2. Use vi or any other text editor to create a unit configuration file called node_exporter.service.
    sudo vi /etc/systemd/system/node_exporter.service
  3. This file should contain the path of the node_exporter executable, and also specify which user should run the executable. Accordingly, add the following code:
  
  [Unit]
  Description=Node Exporter
  [Service]
  User=prometheus
  ExecStart=/home/prometheus/node_exporter/node_exporter
  [Install]
  WantedBy=default.target
  1. Save the file and exit the text editor.
  2. Reload systemd so that it reads the configuration file you just created.
    sudo systemctl daemon-reload
  3. At this point, Node Exporter is available as a service which can be managed using the systemctl command. Enable it so that it starts automatically at boot time.
    sudo systemctl enable node_exporter.service
  4. You can now either reboot your server, or use the following command to start the service manually:
    sudo systemctl start node_exporter.service
  5. 参考：https://www.digitalocean.com/community/tutorials/how-to-use-prometheus-to-monitor-your-centos-7-server

批量注册Node Exporter为系统服务

  1. 以上命令在root用户下操作
  2. 准备文件node_exporter.service，内容如下
  
  [Unit]
  Description=Node Exporter
  [Service]
  User=prometheus
  ExecStart=/home/prometheus/node_exporter/node_exporter
  [Install]
  WantedBy=default.target
  1. cp node_exporter.service /etc/systemd/system
  2. 执行命令： systemctl daemon-reload
  3. 执行命令 systemctl enable node_exporter.service

使用python脚本进行批量注册操作(需要在root下执行）

#!/usr/bin/env python

import os
import shutil
import subprocess
import sys
import getpass

def node(filename,to_dir):
    if not os.path.exists(filename):
        print(filename + 'is not exists')
        sys.exit(1)
    else:
        shutil.copy(filename,to_dir + '/' + os.path.basename(filename))

def register():
    cmd1 = 'systemctl daemon-reload'
    cmd2 = 'systemctl enable node_exporter.service'
    (status1,output1) = subprocess.getstatusoutput(cmd1)
    (status2,output2) = subprocess.getstatusoutput(cmd2)
    if status1:
        sys.stderr.write(output1)
        sys.exit(1)
    if status2:
        sys.stderr.write(output2)
        sys.exit(1)
def check(filename,to_dir,symlink):
    if os.path.exists(os.path.join(to_dir,os.path.basename(filename))) and os.path.exists(symlink):
        print("register node_exporter as a server success")
    else:
        print("register node_exporter as a server fail")

def main():
    filename = '/home/prometheus/node_exporter.service'
    to_dir = "/etc/systemd/system"
    symlink = '/etc/systemd/system/default.target.wants/node_exporter.service'
    node(filename,to_dir)
    register()
    check(filename,to_dir,symlink)

if __name__ == "__main__":
    if getpass.getuser() != 'root':
        print("the python shell need run as user 'root' ")
        sys.exit(1)
    else:
        main()

备忘

systemctl enable node_exporter.service
Created symlink from /etc/systemd/system/default.target.wants/node_exporter.service to /etc/systemd/system/node_exporter.service.
Written on March 2, 2024