目录

一、简介

二、下载安装

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一、简介

        Exporter是Prometheus的指标数据收集组件。它负责从目标Jobs收集数据，并把收集到的数据转换为Prometheus支持的时序数据格式。 和传统的指标数据收集组件不同的是，他只负责收集，并不向Server端发送数据，而是等待Prometheus Server 主动抓取

        因为环境原因，网络不可达的场景，Prometheus可以使用Pushgateway这个组件推送node-exporter的指标数据到远端Prometheus，node-exporter用于采集node的运行指标，包括node的cpu、load、filesystem、meminfo、network等基础监控指标，node-exporter由Prometheus官方提供、维护，属于监控指标收集类UNIX内核操作系统的必备的exporter。

二、下载安装

​​​​​​官网
 

[root@rabbitmq_2 prometheus]# wget https://github.com/prometheus/node_exporter/releases/download/v1.7.0/node_exporter-1.7.0.linux-amd64.tar.gz
[root@rabbitmq_2 prometheus]# tar -zxvf node_exporter-1.7.0.linux-amd64.tar.gz 
[root@rabbitmq_2 prometheus]# mv node_exporter-1.7.0.linux-amd64 /opt/prometheus/node_exporter
[root@rabbitmq_2 prometheus]# chown -R prometheus:prometheus /opt/prometheus

使用ansible批量安装

- hosts: nodes_exporter 
  vars:
    - node_exporter_package: node_exporter-1.7.0.linux-amd64.tar.gz 
    - package_version: node_exporter-1.7.0.linux-amd64
  tasks:
    - name: copy node_exporter_pkg 
      copy:
        src: ./{{node_exporter_package}}
        dest: /opt/prometheus/{{node_exporter_package}}
        owner: root 
        group: root 
        mode: 0644

    - name: "Copy Node_Exporter SystemctlFile"
      copy:
        src: ./node_exporter.service
        dest: /usr/lib/systemd/system/node-exporter.service 
        owner: root 
        group: root 
        mode: 0644 

    - name: "Unzip"
      unarchive:
        src: /opt/prometheus/{{node_exporter_package}}
        dest: /opt/prometheus/node_exporter
        remote_src: yes 
        mode: 0755
      notify:
        - "ln -sv" 

  handlers:
    - name: "ln -sv"
      file:
        src: /opt/prometheus/{{package_version}}
        dest: /opt/prometheus/node_exporter
        state: link

ansible-playbook -i hosts  -e variable_host="nodes_exporter" node_exporter_install.yml 

创建systemd服务

vim  /usr/lib/systemd/system/node_exporter.service
[Unit]
Description=node_exporter
Documentation=https://prometheus.io/
After=network.target
 
[Service]
User=prometheus
Group=prometheus
ExecStart=/opt/prometheus/node_exporter/node_exporter
Restart=on-failure
 
[Install]
WantedBy=multi-user.target

启动
[root@rabbitmq_2 node_exporter]# systemctl daemon-reload
[root@rabbitmq_2 node_exporter]# systemctl start node_exporter.service
[root@rabbitmq_2 node_exporter]# systemctl status node_exporter.service
访问web地址
http://192.168.134.133:9100/metrics

把node_exporter加到prometheus服务

[root@rabbitmq_2 prometheus]# vim prometheus.yml
在scrape_configs 这行下边添加如下配置
scrape_configs:

  - job_name: "prometheus"

    static_configs:
      - targets: ["localhost:9090"]
  # node_exporter配置
  - job_name: "node_exporter"
    scrape_interval: 15s
    static_configs:
    - targets: ["localhost:9100"]
      labels:
        instance: Prometheus服务器
重新载入配置
curl -X POST http://192.168.134.133:9090/-/reload   
或    
systemctl reload prometheus