mysqld_exporter

一. 创建一个 MySQL 用户，并拥有适当的权限

CREATE USER 'mysqld_exporter'@'localhost' IDENTIFIED BY 'password';
GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'mysqld_exporter'@'localhost'
  WITH MAX_USER_CONNECTIONS 3;

二. 下载和启动 mysqld_exporter

wget https://github.com/prometheus/mysqld_exporter/releases/download/v0.9.0/mysqld_exporter-0.9.0.linux-amd64.tar.gz
tar -xzf mysqld_exporter-0.9.0.linux-amd64.tar.gz
export DATA_SOURCE_NAME='mysqld_exporter:password@unix(/var/run/mysqld/mysqld.sock)/'
./mysqld_exporter

如果安装成功，访问 http://localhost:9104/metrics，您将看到 mysqld_exporter 所有 metrics

三. 修改 prometheus 配置

# 修改 prometheus.yml, 添加如下配置
scrape_configs:
 - job_name: 'mysqld'
   static_configs:
    - targets:
      - localhost:9104

重启 Prometheus，访问 http://localhost:9090/graph，然后查询 mysql_up, 你将看到 mysqld 的运行状态。