监控MySQL主从同步是否异常，如果异常，则发送短信或者邮件给管理员

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mb5fca0c87ea3a4 2020-11-30 16:26:00

文章标签 mysql linux sql 发送短信主从同步 文章分类 MySQL 数据库

企业面试题1：（生产实战案例）：监控MySQL主从同步是否异常，如果异常，则发送短信或者邮件给管理员。提示：如果没主从同步环境,可以用下面文本放到文件里读取来模拟：

阶段1：开发一个守护进程脚本每30秒实现检测一次。

阶段2：如果同步出现如下错误号（1158,1159,1008,1007,1062），则跳过错误。

阶段3：请使用数组技术实现上述脚本（获取主从判断及错误号部分）

解答参考1：

#!/bin/sh
#oldboy linux training
#2015-05-17
#说明：本脚本来自老男孩linux21期学员张耀开发！
# Source function library.
. /etc/init.d/functions

# Defined variables
MysqlUser=root
MysqlPass=oldboy123
MysqlPort=3307
Mysqlsock=/data/$MysqlPort/mysql.sock
ErrorNo=(1158 1159 1008 1007 1062)
errorlog=/tmp/error_skip.log
MysqlCmd="/application/mysql/bin/mysql -u$MysqlUser -p$MysqlPass -S $Mysqlsock"

# Judge mysql server is ok?
[ -S $Mysqlsock ] ||{
  echo "Maybe MySQL have someting wrong"
  exit 1
}

# Defined skip error Functions
function error_skip(){
  local flag
  flag=0
  for num in ${ErrorNo[@]}
    do
      if [ "$1" == "$num" ];then
         $MysqlCmd -e'stop slave;set global sql_slave_skip_counter=1;start slave;'
         echo "$(date +%F_%R) $1" >>$errorlog
      else
           echo "$(date +%F_%R) $1" >>$errorlog
         ((flag++))
      fi
  done
  [ "$flag" == "${#ErrorNo[@]}" ] &&{
    action "MySQL Slave" /bin/false
    uniq $errorlog|mail -s "MySQL Slave is error" 12345678@qq.com
  }
}

# Defined check slave Functions
function check_slave(){
  MyResult=`$MysqlCmd -e'show slave status\G'|egrep '_Running|Behind_Master|SQL_Errno' |awk '{print $NF}'`
  array=($MyResult)
  if [ "${array[0]}" == "Yes" -a "${array[1]}" == "Yes" -a "${array[2]}" == "0" ]
    then
    action "MySQL Slave" /bin/true
  else
    error_skip ${array[3]}
  fi
}

# Defined main Functions
function main(){
  while true
     do
       check_slave
       sleep 60
  done
}
main

解答参考2：

#!/bin/sh
#oldboy linux
#2015-05-17
#说明：本脚本来自老男孩教育21期学员李新宇！
USER=root
PASSWORD=123456
PORT=3307
error=(1158 1159 1008 1007 1062)
MYSQLCMD="mysql -u$USER -p$PASSWORD -S /data/$PORT/mysql.sock"

is_run(){
  [ `lsof -i:$PORT|wc -l` -lt 2 ]&&{
    echo "mysql server is stopped"
    exit 1
  }
}

status_array(){
 status=($($MYSQLCMD -e "show slave status\G"|egrep "_Running|Last_Errno|Behind_Master"|awk '{print $NF}'))
}

status_error(){
for((i=0;i<${#error[*]};i++))
do
  if [ "$1" == "${error[$i]}" ]
    then
      $MYSQLCMD -e "stop slave;set global sql_slave_skip_counter=1;start slave;"
  else 
      echo "MySQL slave is failed, errorno is $1"
  fi
done
}

judge_slave(){
  status_array
  if [ "${status[0]}" == "Yes" -a "${status[1]}" == "Yes" -a "${status[3]}" = "0" ]
  then
    echo "MySQL slave is ok"
  else
    status_error ${status[2]}
  fi
}

main(){
while true
do
  is_run
  judge_slave
  sleep 60
done
}
main