杭州linux认证运维实战培训​

杭州linux认证运维实战培训

1、监控MySQL主从同步

企业面试题1：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）

如果没有生产环境可以使用以下的模拟文本，**修改文本模拟故障。

[root@oldboy~]# mysql -uroot -p'oldboy' -S /data/3307/mysql.sock -e "show slavestatus\G;"

*************************** 1. row ***************************

Slave_IO_State:Waiting for master to send event

Master_Host:10.0.0.179 #当前的mysql master服务器主机

Master_User: rep

Master_Port: 3306

Connect_Retry: 60

Master_Log_File:mysql-bin.000013

Read_Master_Log_Pos: 502547

Relay_Log_File:relay-bin.000013

Relay_Log_Pos:251

Relay_Master_Log_File:mysql-bin.000013

Slave_IO_Running:Yes

Slave_SQL_Running: Yes

Replicate_Do_DB:

Replicate_Ignore_DB: mysql

Replicate_Do_Table:

Replicate_Ignore_Table:

Replicate_Wild_Do_Table:

Replicate_Wild_Ignore_Table:

Last_Errno: 0

Last_Error:

Skip_Counter: 0

Exec_Master_Log_Pos: 502547

Relay_Log_Space:502986

Until_Condition:None

Until_Log_File:

Until_Log_Pos: 0

Master_SSL_Allowed: No

Master_SSL_CA_File:

Master_SSL_CA_Path:

Master_SSL_Cert:

Master_SSL_Cipher:

Master_SSL_Key:

Seconds_Behind_Master: 0 #和主库比同步延迟的秒数，这个参数很重要

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

Last_SQL_Errno: 0

Last_SQL_Error:

脚本：

#!/bin/bash

# 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

咨询电话【詹老师】：17706505315

了解更多的杭州Linux认证课程>>>>杭州Linux认证培训

了解更多的杭州培训课程>>>>杭州培训网