安装部署pmm2并监控mycat2
前言
pmm 全称 Percona Monitoring and Management， 是 percona 公司的开源数据库监视器，其架构可通过官网文档 https://docs.percona.com/percona-monitoring-and-management/details/architecture.html 去了解，本质还是 prometheus + grafana 模式，但是使用更便利了。
部署环境如下：
主机1：centos7, ip=192.168.1.20，hostname=h20，安装 pmm2 的服务端，
主机2：centos7, ip=192.168.1.30，hostname=h30，安装 mycat2 和 pmm2 的客户端
主机3：windows10, ip=192.168.1.10, 什么也不用装，用于测试访问服务端提供的web-ui
1. 安装 pmm2 服务端
pmm2服务器安装在 主机1，以下均为在主机1 内的操作
1.1 安装docker
具体安装步骤参考：Install Docker Engine on CentOS 以下列出了关键命令
yum install -y yum-utils
# 安装 docker 仓库
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# 启用稳定版
yum-config-manager --enable docker-ce-stable
# 列出历史版本
yum list docker-ce --showduplicates |sort -r
# 安装 docker
yum install -y docker-ce docker-ce-cli containerd.io
# 查看docke 版本
docker -v
# 查看docker服务 状态
systemctl status docker
# 设置开机自启动
systemctl enable docker
# 取消开机自启动
systemctl disable docker
# 启动docker 服务
systemctl start docker
# 关闭 docker 服务
systemctl stop docker
1.2 安装 pmm-server
参考：https://docs.percona.com/percona-monitoring-and-management/setting-up/server/docker.html
关键命令如下：
# 拉取镜像
docker images
docker pull percona/pmm-server
# 创建持久化数据容器
docker create --volume /srv --name pmm-data percona/pmm-server /bin/true
# 启动 PMM 服务器（注意网络模式为与宿主机共用网络：--network host）
docker run --detach --restart always --network host --volumes-from pmm-data \
--name pmm-server percona/pmm-server
# 检查数据卷是否是 /srv, 否则可能会导致 PMM 数据丢失
docker inspect pmm-data |grep Destination && docker inspect pmm-server |grep Destination
# 容器常用操作
docker ps -a
docker stop pmm-server
docker restart pmm-server
docker rm pmm-server pmm-data
# 进入容器
docker exec -it pmm-server bash
# 开放端口（易漏操作）
firewall-cmd --zone=public --permanent --add-port=7771-7773/tcp --add-port=80/tcp --add-port=443/tcp
firewall-cmd --reload
以下为进入容器内的操作
# 修改时区
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
# 查看时区是否为：CST
date
# 查看pmm-managed的错误日志
tail -100 /srv/logs/pmm-managed.log
1.3 登录web-ui(grafana)
在主机3浏览器打开: https://192.168.1.20，初始账号和密码都是 admin
2. 安装 pmm2 客户端
pmm2的客户端安装在mycat2 所在的主机上，用于收集mycat2的监控数据，
参考文档：https://docs.percona.com/percona-monitoring-and-management/setting-up/client/index.html
以下为使用yum安装方式，关键命令如下：
# 安装 percorna 系列产品的安装工具：percoan-release
yum install -y https://repo.percona.com/yum/percona-release-latest.noarch.rpm
# 查看启用的 percona 库
percona-release show
# 启用 pmm2-client 库
percona-release enable pmm2-client
# 查看历史版本
yum search --showduplicates pmm2-client
# 安装 pmm2-client
yum install -y pmm2-client
# 查看是否安装成功
pmm-admin -v
3. 向 pmm-server注册mycat2开放的监控指标
3.1 打开 mycat2 的监控指标
参考：mycat2权威指南 - 监控 - Prometheus与Grafana监控
以下命令 在主机2（mycat2 所在的主机）操作：
# 开放端口
firewall-cmd --zone=public --permanent --add-port=7066/tcp
firewall-cmd --reload
# 进入 mycat2 安装目录（每个人的可能与此不同）
cd /usr/local/mycat
# 修改配置文件
vi conf/server.json
server.json
{
"properties":{"prometheusPort":7066}, //关键
"server": {
"serverVersion": "8.0.27-mycat-2.0",
"bufferPool": {},
"ip": "0.0.0.0",
"mycatId": 1,
"port": 8066
}
}
在主机3 浏览器查看是否能访问到这些指标
http://192.168.1.20:7066/metrics
3.2 向 pmm-server注册
以下命令 在主机2（mycat2 所在的主机）操作：
3.2.1 向pmm-server 注册mycat2 所在的主机节点
pmm-admin list
pmm-admin status
pmm-admin config --server-insecure-tls --server-url=https://admin:admin@192.168.1.20:443 192.168.1.20 generic h20
可以看到多了一条node记录
3.2.2 向pmm-server 注册mycat2 的监控指标
# 注意 service-name=mycat-jvm，这个名称要与后面讲到的json 面板中设置的一致，所有不用改变这个名称
pmm-admin add external --scheme=http --listen-port=7066 --metrics-path=/metrics --service-name=mycat-jvm
可以看到多了一条 service
3.2.3 检测是否能查询到mycat2的监控指标
在菜单“Explorer ” 中查询 mycat2 的 指标 jvm_info ，点 Run query 看是否有结果
3.3 导入mycat2的监控面板
依次单击菜单 +、 Import、upload json file，上传 mycat2 提供的面板文件（先下载）：Mycat2-monitor.json
导入之后的效果如下，可见这个面板是有问题的，需要简单修改下面板文件
删掉之前的面板，重新导入我修改后的面板文件（在文章末尾），修改后的面板显示效果如下
我修改后的面板文件(Mycat2-monitor-update.json)：
{
"annotations": {
"list": [
{
"builtIn": 1,
"datasource": "-- Grafana --",
"enable": true,
"hide": true,
"iconColor": "rgba(0, 211, 255, 1)",
"name": "Annotations & Alerts",
"type": "dashboard"
}
]
},
"description": "0.01",
"editable": true,
"gnetId": null,
"graphTooltip": 0,
"id": 15,
"iteration": 1593676032267,
"links": [],
"panels": [
{
"datasource": "Metrics",
"fieldConfig": {
"defaults": {
"custom": {
"align": null
},
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": null
},
{
"color": "red",
"value": 80
}
]
}
},
"overrides": []
},
"gridPos": {
"h": 7,
"w": 24,
"x": 0,
"y": 0
},
"id": 30,
"interval": "1m",
"maxDataPoints": 100,
"options": {
"orientation": "auto",
"reduceOptions": {
"calcs": [
"mean"
],
"fields": "",
"values": false
},
"showThresholdLabels": false,
"showThresholdMarkers": true
},
"pluginVersion": "7.0.4",
"targets": [
{
"expr": "mycat_cpu_utility{service_name=\"$service_name\",instance=\"$instance\"}",
"interval": "",
"legendFormat": "",
"refId": "A"
}
],
"timeFrom": "1h",
"timeShift": null,
"title": "CPU利用率",
"type": "gauge"
},
{
"aliasColors": {},
"bars": false,
"dashLength": 10,
"dashes": false,
"datasource": "Metrics",
"description": "mycat2 客户端数量",
"fieldConfig": {
"defaults": {
"custom": {
"align": null
},
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
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"value": null
},
{
"color": "red",
"value": 80
}
]
}
},
"overrides": []
},
"fill": 1,
"fillGradient": 0,
"gridPos": {
"h": 6,
"w": 24,
"x": 0,
"y": 7
},
"hiddenSeries": false,
"id": 8,
"interval": "1m",
"legend": {
"avg": false,
"current": false,
"max": false,
"min": false,
"show": true,
"total": false,
"values": false
},
"lines": true,
"linewidth": 1,
"maxDataPoints": 1000,
"nullPointMode": "null",
"options": {
"dataLinks": []
},
"percentage": false,
"pluginVersion": "7.0.4",
"pointradius": 2,
"points": false,
"renderer": "flot",
"seriesOverrides": [],
"spaceLength": 10,
"stack": false,
"steppedLine": false,
"targets": [
{
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"format": "time_series",
"interval": "",
"legendFormat": "",
"refId": "B"
}
],
"thresholds": [],
"timeFrom": "1h",
"timeRegions": [],
"timeShift": null,
"title": "连接mycat2 客户端数量",
"tooltip": {
"shared": true,
"sort": 0,
"value_type": "individual"
},
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{
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"dashLength": 10,
"dashes": false,
"datasource": "Metrics",
"description": "",
"fieldConfig": {
"defaults": {
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"mappings": [],
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},
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"renderer": "flot",
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"targets": [
{
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"interval": "",
"legendFormat": "",
"refId": "A"
}
],
"thresholds": [],
"timeFrom": "1h",
"timeRegions": [],
"timeShift": null,
"title": "线程池活跃线程数量",
"tooltip": {
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"sort": 0,
"value_type": "individual"
},
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"fieldConfig": {
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{
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"description": "数据源存活",
"fieldConfig": {
"defaults": {
"custom": {},
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"values": false
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},
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"targets": [
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"intervalFactor": 3,
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"refId": "A"
}
],
"timeFrom": "1h",
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"title": "数据源存活",
"type": "stat"
},
{
"aliasColors": {},
"bars": false,
"dashLength": 10,
"dashes": false,
"datasource": "Metrics",
"fieldConfig": {
"defaults": {
"custom": {
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},
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
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{
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}
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},
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},
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"w": 24,
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"legend": {
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"current": false,
"max": false,
"min": false,
"show": true,
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"values": false
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"nullPointMode": "null",
"options": {
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"pluginVersion": "7.0.4",
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"renderer": "flot",
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"steppedLine": false,
"targets": [
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"legendFormat": "",
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],
"thresholds": [],
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{
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"dashes": false,
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"fieldConfig": {
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