Postgresq9.6主从部署

Postgresq9.6主从部署

实验环境

1.yun安装

rpm -ivh https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-6-x86_64/pgdg-centos96-9.6-3.noarch.rpmyum install postgresql96.x86_64 postgresql96-server.x86_64 -y

2.主从配置

2.1 主数据库配置

启动master

/etc/init.d/postgresql-9.6 initdb/etc/init.d/postgresql-9.6 startsu - postgrespsql

授权

create role repl login replication encrypted password '51idc.com';

编辑hba文件

/var/lib/pgsql/9.6/data/pg_hba.conf

新增

host    replication     repl            172.17.10.0/24         md5host    all            repl            172.17.10.0/24         trust

编辑配置文件

/var/lib/pgsql/9.6/data/postgresql.conf

listen_addresses = 172.17.10.190wal_level = hot_standby  #热备模式max_wal_senders= 6 #可以设置最多几个流复制链接，差不多有几个从，就设置多少wal_keep_segments = 10240  #重要配置 wal_send_timeout = 60s max_connections = 512 #从库的 max_connections要大于主库archive_mode = on #允许归档 archive_command = 'cp %p /url/path%f'   #根据实际情况设置

2.2 从数据库配置

su - postgres

如果开始为启动数据库可忽略下一步

rm -rf /var/lib/pgsql/9.6/data/*  #开始没有启动从数据库，这一步可以省略 pg_basebackup -h 172.17.10.190 -U repl -D /var/lib/pgsql/9.6/data -X stream -Pcp /usr/pgsql-9.6/share/recovery.conf.sample /var/lib/pgsql/9.6/data/recovery.conf

修改配置文件recovery.conf

standby_mode = onprimary_conninfo = 'host=172.17.10.190 port=5432 user=repl password=51idc.com'trigger_file = '/var/lib/pgsql/9.6/data/trigger.kenyon'    #主从切换时后的触发文件recovery_target_timeline = 'latest'

配置postgresql.conf文件

listen_addresses = 172.17.10.189wal_level = hot_standby max_connections = 1000 #一般从的最大链接要大于主的。 hot_standby = on #说明这台机器不仅仅用于数据归档，也用于查询 max_standby_streaming_delay = 30s wal_receiver_status_interval = 10s #多久向主报告一次从的状态。 hot_standby_feedback = on #如果有错误的数据复制，是否向主进行范例

检测

select client_addr,sync_state from pg_stat_replication;

查看主从状态

select * from pg_stat_replication;

脚本监控主从

github地址

#!/bin/bash# mail  xuel@51idc.comdata=`date +%Y-%M-%d" "%H:%m`netstat -lntup|grep 5432 && ps -ef|grep postmasterif [ $? -eq 0 ];thenfor IP in 172.17.10.188 172.17.10.189do/usr/bin/psql -h 172.17.10.190 -p 5432 -U repl -d postgres --command "select * from pg_stat_replication"|grep $IPif [ "$?" != "0" ];thenecho "postgresql master-slave status is error! please login check!"|mail -r "xuel@51idc.com" -s "postgresql master-slave status is error" xuel@51idc.com \&& echo "$data postgresql postgresql master-slave status is error!">>/var/log/postgresql-error.logfidoneelseecho "postgresql master-slave status is error! please login check!"|mail -r "xuel@51idc.com" -s "postgresql master-slave status is error" xuel@51idc.com \&& echo "$data postgresql postgresql master-slave status is error!">>/var/log/postgresql-error.logfi

2.3主从切换

主库查看进程为sender

备库

停止主库

查看slave的日志

创建触发文件，切换主

touch trigger.kenyon

查看slave的日志，面前已经切换为主

使用pg_controldata

备机状态为： in archive recovery

主库状态为：in production