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http://192.168.1。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
四、安装和运行Grafana
1、安装Grafana
#wget https://s3-us-west-2.amazonaws.com/grafana-releases/release/grafana-4.3.2-1.x86_64.rpm
#yum localinstall grafana-4.3.2-1.x86_64.rpm
2、编辑配置文件 /etc/grafana/grafana.ini ，修改 dashboards.json 段落下两个参数的值：
[dashboards.json]
enabled = true
path = /var/lib/grafana/dashboards
3、运行 Grafana
systemctl start grafana-server
# [root@monitor prometheus_exporters]# ps aux |grep grafana
root 3211 0.0 0.0 112664 972 pts/1 S+ 11:40 0:00 grep --color=auto grafana
grafana 21241 0.3 0.8 805720 39620 ? Ssl 6月12 4:42 /usr/sbin/grafana-server --config=/etc/grafana/grafana.ini --pidfile= cfg:default.paths.logs=/var/log/grafana cfg:default.paths.data=/var/lib/grafana cfg:default.paths.plugins=/var/lib/grafana/plugins我们可通过 http://192.168.1.199:3000 访问Grafana网页界面（缺省的帐号/密码为admin/admin）：
登录并设置数据源
至此大功告成
我们可以看到os与数据库监控数据了
