Prometheus -- 09 -- Prometheus+Grafana搭建EMQ监控

原文链接：Prometheus – 09 – Prometheus+Grafana搭建EMQ监控

emq_exporter 插件用于监控 EMQ 相关的性能指标，这里我们使用 Prometheus+Grafana 来搭建 EMQ 监控

一、安装 emq_exporter

上 emq_exporter 官网下载最新的 emq_exporter
- cd /usr/local/prometheus
- wget https://github.com/nuvo/emq_exporter/releases/download/v0.5.0/emq_exporter-0.5.0-linux.tar.gz
- tar -zxvf emq_exporter-0.5.0-linux.tar.gz
- rm -rf emq_exporter-0.5.0-linux.tar.gz
添加配置文件 (json 格式)，设置 18083 监控平台的账号密码 (EMQ 自带的监控平台)，账号默认为：admin，密码默认为：public
- cd /usr/local/prometheus/emq_exporter-0.5.0-linux
- vim auth.json
```
{
  "username": "admin",
  "password": "public"
}
```
- :wq

编写 prometheus-emqtt.service 文件

vim /lib/systemd/system/prometheus-emqtt.service

[Unit]
Description=Prometheus EMQTT
After=network.target prometheus.service

[Service]
Type=simple
ExecStart=/usr/local/prometheus/emq_exporter-0.5.0-linux/emq_exporter --emq.uri="http://127.0.0.1:18083" --emq.creds-file=/usr/local/prometheus/emq_exporter-0.5.0-linux/auth.json --web.listen-address=0.0.0.0:9540

[Install]
WantedBy=multi-user.target

将 emq_exporter 服务设为开机自启并启动
- systemctl daemon-reload
- systemctl enable prometheus-emqtt.service
- systemctl start prometheus-emqtt.service
查看 emq_exporter 服务 (默认端口为: 9540)

二、添加 emq_exporter

安装好 emq_exporter 后，我们需要在 Prometheus 中对其进行集成

修改 Prometheus 的配置文件 (prometheus.yml)，添加 emq 服务 (在 scrape_configs 属性下添加)

cd /usr/local/prometheus/prometheus-2.17.1.linux-amd64

vim prometheus.yml

scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
    - targets: ['localhost:9090']

  - job_name: 'emqtt'
    static_configs:
    - targets: ['localhost:9540']