promethus监控mysql

一、mysqld_exporter安装

下载页面

https://github.com/prometheus/mysqld_exporter/releases

登录到mysql服务器，解压，并运行

# 解压
tar zxvf mysqld_exporter-0.12.0.linux-amd64.tar.gz -C /usr/src/
cd /usr/src/mysqld_exporter-0.12.0.linux-amd64

# 创建目录，复制文件
mkdir -p /etc/mysqld_exporter/bin/
mkdir -p /etc/mysqld_exporter/conf
cp mysqld_exporter /etc/mysqld_exporter/bin/

二、mysql授权

mysqld_exporter需要连接Mysql，首先为它创建用户并赋予所需的权限：

grant replication client,process on *.* to exporter@'%' identified by '27dc703b';
grant select on performance_schma.* to exporter@'%';
flush PRIVILEGES;

三、运行mysqld_exporter

新建配置文件

vi /etc/mysqld_exporter/conf/my.cnf

内容如下：

[client]
user=exporter
password=27dc703b
port=3306
host=127.0.0.1

启动进程

/etc/mysqld_exporter/bin/mysqld_exporter --config.my-cnf="/etc/mysqld_exporter/conf/my.cnf" --web.listen-address=":9104"

观察是否有报错信息，如果没有报错信息，就可以封装service服务了

四、mysqld_exporter封装service

vim /lib/systemd/system/mysqld_exporter.service

内容如下：

[Unit]
Description=mysqld monitor
After=network.target

[Service]
ExecStart=/etc/mysqld_exporter/bin/mysqld_exporter --config.my-cnf="/etc/mysqld_exporter/conf/my.cnf" --web.listen-address=":9104"
ExecStop=-/sbin/start-stop-daemon --quiet --stop --retry QUIT/5
TimeoutStopSec=5
KillMode=mixed

[Install]
WantedBy=multi-user.target

重新加载service配置文件，设置开机自启动，并启动服务

systemctl daemon-reload
systemctl enable mysqld_exporter.service
systemctl start mysqld_exporter.service

查看端口

root@ubuntu:~# netstat -anpt|grep mysqld_exporte
tcp6       0      0 :::9104                 :::*                    LISTEN      3253/mysqld_exporte

使用网页访问metrics

http://192.168.1.24:9104/metrics

效果如下：

如果数据输出正常，则表示成功。

五、promethus增加job

vim /opt/prometheus/prometheus.yml

增加以下内容：

- job_name: mysqld_exporter
static_configs:
  - targets:
    - 192.168.1.24:9104
    labels:
      instance: mysql-24

重启prometheus

root@ubuntu:/opt/prometheus# docker ps |grep prometheus
0fa256f85750        prom/prometheus     "/bin/prometheus --c…"   About an hour ago   Up 29 seconds       0.0.0.0:9090->9090/tcp   wizardly_kirch

root@ubuntu:/opt/prometheus# docker restart 0fa256f85750