Grafana+Prometheus系統監控之MySql


架構

grafana和prometheus之前安裝配置過,見:Grafana+Prometheus打造全方位立體監控系統

MySql安裝

MySql的地位和重要性就不言而喻了,作為開源產品深受廣大中小企業以及互聯網企業喜愛,所以這里我們也有必要對其進行相應的監控。

由於最近更換了CentOS7,這里對MySql重新安裝一遍,順便做個記錄,CentOS7的yum源中默認好像是沒有mysql的。為了解決這個問題,我們要先下載mysql的repo源。

列出所有版本信息:

lsb_release -a

下載mysql的repo源:

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

安裝mysql-community-release-el7-5.noarch.rpm包:

rpm -ivh mysql-community-release-el7-5.noarch.rpm

安裝mysql:

 yum install mysql-server -y

修改權限,否則會報錯:

chown -R root:root /var/lib/mysql

重啟mysql服務:

service mysqld restart

登錄並重置密碼:

## 直接回車進入mysql控制台
mysql -u root
mysql > use mysql;
mysql > update user set password=password('123456') where user='root';
mysql > exit;

mysqld_exporter安裝

下載並解壓:

https://github.com/prometheus/mysqld_exporter/releases/download/v0.10.0/mysqld_exporter-0.10.0.linux-amd64.tar.gz

tar -xvf mysqld_exporter-0.10.0.linux-amd64.tar.gz

mysqld_exporter需要連接Mysql,首先為它創建用戶並賦予所需的權限:

 GRANT REPLICATION CLIENT, PROCESS ON *.* TO 'exporter'@'localhost' identified by '123456';
 GRANT SELECT ON performance_schema.* TO 'exporter'@'localhost';
 flush privileges;

創建.my.cnf文件 vi .my.cnf:

[client]
user=exporter
password=123456

運行mysqld_exporter:

./mysqld_exporter -config.my-cnf=".my.cnf" &

Prometheus配置

修改prometheus.yml加入MySql節點:

global:
  scrape_interval:     15s
  evaluation_interval: 15s

scrape_configs:

  - job_name: prometheus
    static_configs:
      - targets: ['localhost:9090']
        labels:
          instance: prometheus

  - job_name: linux1
    static_configs:
      - targets: ['192.168.1.120:9100']
        labels:
          instance: sys1

  - job_name: linux2
    static_configs:
      - targets: ['192.168.1.130:9100']
        labels:
          instance: sys2

  - job_name: redis1
    static_configs:
      - targets: ['192.168.1.120:9121']
        labels:
          instance: redis1

  - job_name: mysql
    static_configs:
      - targets: ['192.168.1.120:9104']
        labels:
          instance: db1

保存以后重啟Prometheus,查看targets:

最后登錄grafana查看MySql監控信息:

參考文檔:
https://github.com/prometheus/mysqld_exporter


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