这篇文章介绍了如何在CentOS 7.2下使用Prometheus和Grafana对MySQL服务器性能进行监控。内容基于这篇文章，结合了自己的实际实践并根据最新版本的应用进行了调整。
一、 Prometheus 是一个开源的服务监控系统和时间序列数据库。：
官方GitHub地址为：https://github.com/prometheus/prometheus
官方地址：https://prometheus.io/
官方拓扑图如下
特性：
高维度数据模型
自定义查询语言
可视化数据展示
高效的存储策略
易于运维
提供各种客户端开发库
警告和报警
数据导出
二、安装Prometheus(服务器环境为CentOS 7.2，本实验服务端跟被监控MySQL在同一台服务器)
前提条件请关闭SELinux与Firewalld(centos6 为iptables)
下载安装prometheus
$ wget https://github.com/prometheus/prometheus/releases/download/v1.7.1/prometheus-1.7.1.linux-amd64.tar.gz
$ mkdir /opt/prometheus
$ tar zxf prometheus-1.7.1.linux-amd64.tar.gz -C /opt/prometheus --strip-components=1
编辑配置prometheus.yml文件，内容如下：
global:
scrape_interval: 15s
evaluation_interval: 15s
external_labels:
monitor: 'codelab-monitor'
rule_files:
scrape_configs:
- job_name: 'prometheus'
static_configs:
- targets: ['192.168.1.199:9090']
- job_name: linux
static_configs:
- targets: ['192.168.1.199:9100']
labels:
instance: db1
- job_name: mysql
static_configs:
- targets: ['192.168.1.199:9104']
labels:
instance: db1
后台启动prometheus
nohup /opt/prometheus/prometheus -config.file=prometheus.yml &
tail -200f nohup.out
time="2017-06-12T11:51:16+08:00" level=info msg="Starting prometheus (version=1.7.0, branch=master, revision=bfa37c8ee39d11078662dce16c162a61dccf616c)" source="main.go:88"
time="2017-06-12T11:51:16+08:00" level=info msg="Build context (go=go1.8.3, user=root@7a6329cc02bb, date=20170607-09:43:48)" source="main.go:89"
time="2017-06-12T11:51:16+08:00" level=info msg="Host details (Linux 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 monitor (none))" source="main.go:90"
time="2017-06-12T11:51:16+08:00" level=info msg="Loading configuration file prometheus.yml" source="main.go:252"
time="2017-06-12T11:51:16+08:00" level=info msg="Loading series map and head chunks..." source="storage.go:428"
time="2017-06-12T11:51:16+08:00" level=info msg="2200 series loaded." source="storage.go:439"
time="2017-06-12T11:51:16+08:00" level=info msg=" source="web.go:259"Prometheus提供一个内置的web界面。我们可以通过。199:9090访问
在 Status -> Targets 页面下，我们可以看到我们配置的两个Target，它们的 State
三、接下来我们安装client客户端
1、安装client
$ wget https://github.com/prometheus/node_exporter/releases/download/v0.14.0/node_exporter-0.14.0.linux-amd64.tar.gz
$ wget https://github.com/prometheus/mysqld_exporter/releases/download/v0.10.0/mysqld_exporter-0.10.0.linux-amd64.tar.gz
$ mkdir /opt/prometheus_exporters
$ tar zxf node_exporter-0.14.0.linux-amd64.tar.gz -C /opt/prometheus_exporters --strip-components=1 && tar zxf mysqld_exporter-0.10.0.linux-amd64.tar.gz -C /opt/prometheus_exporters --strip-components=1
2、启动os监控client
nohup /opt/prometheus_exporters/node_exporter &
tail -200f nohup.out
time="2017-06-12T11:28:52+08:00" level=info msg=" - hwmon" source="node_exporter.go:162"
time="2017-06-12T11:28:52+08:00" level=info msg=" - netstat" source="node_exporter.go:162"
time="2017-06-12T11:28:52+08:00" level=info msg=" - stat" source="node_exporter.go:162"
time="2017-06-12T11:28:52+08:00" level=info msg=" - vmstat" source="node_exporter.go:162"
time="2017-06-12T11:28:52+08:00" level=info source="node_exporter.go:186"
3、mysqld_exporter需要连接到MySQL,需要授权
mysql> GRANT REPLICATION CLIENT, PROCESS ON *.* TO 'monitor'@'localhost' identified by 'test123';
mysql> GRANT SELECT ON performance_schema.* TO 'monitor'@'localhost';
4、创建 .my.cnf 文件并运行mysqld_exporter
[root@monitor prometheus_exporters]# cat .my.cnf
[client]
user=monitor
password=test123
启动mysqld_exporter
nohup /opt/prometheus_exporters/mysqld_exporter -config.my-cnf=".my.cnf" &
tail -200f nohup.out
time="2017-06-12T11:30:07+08:00" level=info msg="Starting mysqld_exporter (version=0.10.0, branch=master, revision=80680068f15474f87847c8ee8f18a2939a26196a)" source="mysqld_exporter.go:460"
time="2017-06-12T11:30:07+08:00" level=info msg="Build context (go=go1.8.1, user=root@3b0154cd9e8e, date=20170425-11:24:12)" source="mysqld_exporter.go:461"
time="2017-06-12T11:30:08+08:00" level=info msg=" source="mysqld_exporter.go:479"我们回到192.168.1.199:9090，可以看到
Status -> Targets 页面
