PostgreSQL 流复制监控脚本

https://github.com/AndyYHM/Writing/blob/PostgreSQL/20181219-PostgreSQL Stream MON.md

整理之前的脚本文档，搬家至博客园，梳理一下之前写的shell脚本

适用于PostgreSQL版本10、版本9替换函数名称即可，系统centos 7验证

_xlog_location<=> _wal_lsn

_location <=> _lsn

1. 脚本输出效果

1.1 主节点显示效果

        STREAM_ROLE    : Master

        ------------------------------

        Replication Client Info:

        ------------------------------

        PID            : 25424

        CLIENT_ADDR    : 20.9.6.213

        SYNC_STATE     : async

        STATE          : streaming

        WRITE_DIFF     : 0bytes

        FLUSH_DIFF     : 0bytes

        REPLAY_DIFF    : 0bytes         

        Replication Client Info:

        ------------------------------

        PID            : 24586

        CLIENT_ADDR    : 20.9.6.212

        SYNC_STATE     : sync

        STATE          : streaming

        WRITE_DIFF     : 0bytes

        FLUSH_DIFF     : 0bytes

        REPLAY_DIFF    : 0bytes

1.2 从节点效果

STREAM_ROLE    : Slave

------------------------------

Replication Info

------------------------------

CLUSTER_STATE  : in_archive_recovery

SERVER_ADDR    : 20.9.6.219

USER           : replicator

APP_NAME       : node12

TARGET_TIMELINE:

READ_ONLY      : on

2. 功能说明

• 判定主机角色
• 如果为Master节点，则显示复制节点信息，及与主节点差值
• 如果为Replication节点，则显示为本节点相关信息

3. 使用说明

• 根据实际环境修改脚本pgdata=""
• postgres系统用户执行，保证有执行权限
• 本地执行脚本sh pg10_stream.sh

4. pg10_stream.sh脚本内容

#!/bin/bash

################################

## Author: andy_yhm@yeah.net

## Version: 1.0

## Date:    20181219

################################

clear

host_var="/tmp"

pgdata="/pgdb/pgdata"

work_dir=$(cd `dirname $0`;pwd)

cd $work_dir

is_master=$(psql -h $host_var -c 'select  pg_is_in_recovery();'| sed -n 3p)

if [ "$is_master" == " f" ];then

    rep=$(psql  -h $host_var -c 'select  pid, client_addr, sync_state, state,pg_size_pretty( pg_wal_lsn_diff(pg_current_wal_lsn(),write_lsn)) as write_diff, pg_size_pretty(pg_wal_lsn_diff(pg_current_wal_lsn(),flush_lsn)) as flush_diff, pg_size_pretty(pg_wal_lsn_diff(pg_current_wal_lsn(),replay_lsn)) as replay_diff      from pg_stat_replication;'| sed -n '3,$'p |tac  | sed -n '3,$'p | sed s/" *"//g )

    if [ ! "$rep" ];then

      echo "Waring! No Replication Client Found"

    else

      printf "\n\t%-15s: %-15s\n" "STREAM_ROLE" "Master"

      echo  -e "\t------------------------------"

      echo "$rep" | while read i

        do

          echo  -e "\tReplication Client Info:\n\t------------------------------"

          a=(null PID CLIENT_ADDR SYNC_STATE STATE WRITE_DIFF FLUSH_DIFF REPLAY_DIFF)

          for j in `seq 7`

            do

              k=${a[j]}

              echo -e "$i" | awk -v k=$k -v j=$j -F"|" '{printf "\t%-15s: %-15s\n",k,$j}'

            done

          echo ""

        done

      client_check_info=(`psql -h $host_var -c 'select client_addr from pg_stat_replication;' | sed -n '3,$'p |tac  | sed -n '3,$'p | sed s/" *"//g`)

      if [ ! -f pg_stream_client ]; then

        echo "$client_check_info" > pg_stream_client

      else

        client_before=(`cat pg_stream_client`)

        if [ ${#client_before[*]} -gt 0 ]; then

          for i in `seq ${#client_before[*]}`

            do

              index=$(expr $i - 1)

              if [ "${client_check_info[$index]}"x !=  "${client_before[$index]}"x ];then

                printf  "\tWarning! Replication Client Lost.\n"

              else

                echo "$client_check_info" > pg_stream_client

              fi

            done

         else

           printf  "\tAttention! No Client Info found in pg_stream_client.\n"

         fi

      fi

    fi

elif [ "$is_master" == " t" ];then

    declare -A connect_info_dict

    conninfo=$(cat $pgdata/recovery.conf| grep -i "^primary_conninfo" | awk -F"'" '{print $2}' |sed s/"  *"/" "/g |sed s/"="/"\"]=\""/g | sed s/" "/"\" [\""/g | sed s/^/"[\""/g |sed s/$/"\""/g|sed s/" "/"\n"/g)

    eval "connect_info_dict=($conninfo)"

    cluster_state=$(pg_controldata  | grep cluster | sed s/"  *"/" "/g | cut -d ":" -f2| sed s/"^ "//g|  sed s/" "/"_"/g)

    server_addr=${connect_info_dict["host"]}

    user=${connect_info_dict["user"]}

    application_name=${connect_info_dict["application_name"]}

    recovery_target_timeline=${connect_info_dict["recovery_target_timeline"]}

    read_only=$(psql  -h $host_var -c 'show  transaction_read_only;' | sed -n '3p')

    output(){

      printf "\t%-15s: %-15s\n" $1 $2

    }

    printf "\n\t%-15s: %-15s\n" "STREAM_ROLE" "Slave"

    echo  -e "\t------------------------------"

    echo  -e "\tReplication Info\n\t------------------------------"

    output "CLUSTER_STATE" $cluster_state

    output "SERVER_ADDR" $server_addr

    output "USER" $user

    output "APP_NAME" $application_name

    output "TARGET_TIMELINE" $recovery_target_timeline

    output "READ_ONLY" $read_only

    echo ""

else

    echo "Warning! Can't Connect to Database. Please Check Database Status "

fi

exit 0

psql  -c 'select application_name,client_addr ,sync_state from pg_stat_replication;' | sed -n '3,$'p |tac  | sed -n '3,$'p | sed s/" *"//g