如何用prometheus监控ECS虚拟机上的信息

windows主机上安装上prometheus程序，用prometheus来监控华为云上面的ECS虚拟机电脑（linux系统）的内存、cpu等信息。

prometheus提供统一监控管理，但是搜集被监控的虚拟机电脑的信息需要使用node-exporter等软件在被监控的机器上安装后自动搜集，prometheus的配置文件只负责配置被监控虚拟机的ip地址、端口，获取方式等。

一、在任意windows主机上安装prometheus

• 下载prometheus

https://prometheus.io/download/

• 启动prometheus

解压包prometheus-2.9.2.windows-amd64.tar.gz后，双击prometheus.exe即可启动

• 查看默认的本地监控状态

  
  

二、在被监控的ECS linux虚拟机上安装启动node exporter

• 安装node exporter

# wget https://github.com/prometheus/node_exporter/releases/download/v0.18.0/node_exporter-0.18.0.linux-386.tar.gz
# tar -zxvf node_exporter-0.18.0.linux-386.tar.gz
# mkdir /usr/local/prometheus
# mkdir /usr/local/prometheus/node_exporter
# mv node_exporter-0.18.0.linux-386 /usr/local/prometheus/node_exporter

• 创建linux用户

      该新linux用户存储目录为/var/lib/prometheus

# groupadd   prometheus
# useradd -g prometheus -m -d /var/lib/prometheus -s /sbin/nologin prometheus

• 创建Systemd服务

$ vim /etc/systemd/system/node_exporter.service
[Unit]
Description=node_exporter
After=network.target
[Service]
Type=simple
User=prometheus
ExecStart=/usr/local/prometheus/node_exporter/node_exporter
Restart=on-failure
[Install]
WantedBy=multi-user.target

• 启动node exporter

# systemctl start node_exporter
# systemctl status node_exporter
● node_exporter.service - node_exporter
 Loaded:   loaded (/etc/systemd/system/node_exporter.service; disabled; vendor preset:   enabled)
 Active:   active (running) since Tue 2019-05-14 15:50:56 CST; 6s ago
 Main PID: 15434 (node_exporter)
 Tasks: 5
 Memory: 1.3M
 CPU: 9ms
 CGroup:   /system.slice/node_exporter.service
 └─15434   /usr/local/prometheus/node_exporter/node_exporter
 
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" -   sockstat" source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" - stat"   source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" -   textfile" source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" - time"   source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" -   timex" source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" -   uname" source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" -   vmstat" source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" - xfs"   source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003 node_exporter[15434]:   time="2019-05-14T15:50:56+08:00" level=info msg=" - zfs"   source="node_exporter.go:104"
May 14 15:50:56 ecs-ecff-0003   node_exporter[15434]: time="2019-05-14T15:50:56+08:00" level=info   msg="Listening on :9100" source="node_exporter.go:170"

三、配置prometheus

在默认的windows机器上的prometheus.yml文件中新增监控结点

scrape_configs:
  - job_name: 'file-zj'
    file_sd_configs:
    - files:
      - '/data/targets.json'     //被监控信息存在的文件的路径，是相对路径

在/data/targets.json文件中新增监控结点，其中ecs-xxx-0003为虚拟机主机名，9101为端口号

 {
 "targets": [ "ecs-xxx-0003:9101"],
 "labels": {
 "job": "linux-remote-exporter"
 }
 }

过一会儿再刷新http://127.0.0.1:9090/targets ，新的监控结点就显示出来了。

切换到http://127.0.0.1:9090/graph 中可查看具体的ecs虚拟机上cpu、内存等监控信息