PostgreSQL Hot Standby环境监测脚本

Postgresql 在9.0引进了Stream Replication;为数据库集群提供一种高可用性；本文提供一个环境监测脚本

环境搭建： 参考--http://www.cnblogs.com/lottu/p/5584923.html

环境切换： 参考--http://www.cnblogs.com/lottu/p/5725309.html

提供脚本如下：

##===========================================================
##   postgres_db_check.sh
##   created by lottu
##   2016/08/07
##   usage: postgres_db_check.sh
##============================================================
#!/bin/bash  

export LANG="en_US.utf8"
export DATE=`date +"%Y%m%d"`
admail="[email protected]"
standby_number=1    #本环境只有一个备库;
m_err_exit=20
s_err_exit=21

#先判断主库是否正常运行
pg_ctl status | grep running
if [ $? -ne 0 ];then
  echo "master postgres db is not running;please check it!" | mail -s "master postgres db is not running" $admail
  exit ${m_err_exit}
fi

#查看集群中流复制的状态；可根据表pg_stat_replication进行判断
psql -t -q -c "select client_addr,sync_state,state from pg_stat_replication" > lottu.out

l=`awk -F"|" ‘/streaming/{n+=1}END{print n}‘ lottu.out`

if [ $l -ne ${standby_number} ];then
  echo "standby postgres db is not running;please check it!" | mail -s "standby postgres db is not running" $admail
  exit ${s_err_exit}
fi