Patroni是Cybertec公司基于python語言開發(fā)的，可用于使用流復制來創(chuàng)建，管理，維護和監(jiān)視高可用性PostgreSQL集群設(shè)置的工具。

目前，Patroni+Etcd 是最為推薦的PostgreSQL數(shù)據(jù)庫高可用方案之一。

PostgreSQL有postgres_exporter監(jiān)控采集器。對于Patroni高可用工具自身的監(jiān)控，有啥子監(jiān)控方案嗎？

一起來看看 ，鮮為人知的?patroni-exporter?吧。

一、patroni-exporter 部署

環(huán)境要求：Requires python >= 3.6?

軟件包下載：https://github.com/Showmax/patroni-exporter

?patroni_export 安裝
?

1.1、安裝python系統(tǒng)包pip3.6 install prometheus_client  pip3.6 install python-dateutil1.2、unzip 解壓 patroni-exporter-master.zip[root@HD-IOV-PROMETHEUS-MONITOR patroni]# ll
total 12
drwx------ 3 root root  137 Aug  1 10:39 patroni-exporter-master
-rw------- 1 root root 8566 Aug  1 10:31 patroni-exporter-master.zip1.3、 patroni-exporter服務(wù)啟動腳本# cat /etc/systemd/system/patroni_exporter.service 
[Unit]
Description=patroni_exporter
After=network.target
?
[Service]
Type=simple
ExecStart=/usr/bin/python3.6 /root/dba_zc/patroni/patroni-exporter-master/patroni_exporter.py   --port 51234 --patroni-url http://172.24.131.8:8008/patroni --timeout 5 
TimeoutSec = 60
Restart = on-failure
RestartSec = 2
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[Install]1.4、patroni_exporter啟動systemctl start patroni_exporter

?

二、patroni-exporter對接Prometheus

為了方便，這里采用靜態(tài)注冊：靜態(tài)的將服務(wù)的IP和抓取指標的端口號配置在Prometheus yaml文件的scrape_configs配置下。

  - job_name: patroni-job    static_configs:    - targets: ['172.26.234.25:51234','172.26.234.25:51238','172.26.234.25:51239']

訪問prometheus?web，能看到各監(jiān)控export為UP即正常

三、patroni-exporter采集數(shù)據(jù)Grafana可視化

我基于patronictl version 1.6.1?下?patroni-exporter采集數(shù)據(jù)，編寫了一個 Grafana?Dashboard for Patroni exporter,效果如下

四、patroni基于Alertmanager告警

?# cat patroni_rules.yml

groups:

- name: for_common

rules:

- alert: IOV-patroni_patroni_info

expr: patroni_patroni_info != 1

for: 1m

labels:

level: 3

annotations:

cur_value: '{{ $value }}'

description: '{{ $labels.instance}} of {{$labels.job}} patroni has down 1m'

?

- alert: IOV-patroni_patroni_pause

expr: patroni_patroni_pause != 0

for: 1m

labels:

level: 3

annotations:

cur_value: '{{ $value }}'

description: '{{ $labels.instance}} of {{$labels.job}} patroni 處于 pause 1m'

?

?

- alert: IOV-patroni_postgresql_timeline

expr: changes(patroni_postgresql_timeline[1m]) != 0

for: 1m

labels:

level: 3

annotations:

cur_value: '{{ $value }}'

description: '{{ $labels.instance}} of {{$labels.job}} patroni change postgresql_timeline 1m'

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五、patroni 服務(wù)高可用性優(yōu)化

針對patroni服務(wù)非正常關(guān)閉，os systemd自動重啟拉起，保障工具的高可用性。

異常終止后自動重啟，systemd控制參數(shù)Restart=always?、RestartSec=5、?StartLimitInterval=0?[root@ZL-IOV-ZNA-L2-DBORCH02 system]# cat /etc/systemd/system/patroni.service [Unit]Description=Runners to orchestrate a high-availability PostgreSQLAfter=syslog.target network.target[Service]Type=simpleUser=postgresGroup=postgres#StandardOutput=syslogExecStartPre=-/usr/bin/sudo /sbin/modprobe softdogExecStartPre=-/usr/bin/sudo /bin/chown postgres /dev/watchdogExecStart=/usr/bin/patroni /software/patroni/patroni.ymlExecReload=/bin/kill -s HUP $MAINPIDKillMode=processTimeoutSec=30Restart=alwaysRestartSec=5StartLimitInterval=0[Install]WantedBy=multi-user.target

patroni?高可用測試??

patroni異常終止，自動重新拉起?