linux shell 整理收集(不断更新)

1)主从复制延时判断 （转 http://www.cnblogs.com/gomysql/p/3862018.html)

   说明：

不要通过Seconds_Behind_Master去判断，该值表示slave上SQL线程和IO线程之间的延迟
1、首先看 Relay_Master_Log_File 和 Master_Log_File 是否有差异
2、如果Relay_Master_Log_File 和 Master_Log_File 有差异的话，那说明延迟很大
3、如果Relay_Master_Log_File 和 Master_Log_File 没有差异，再来看Exec_Master_Log_Pos 和 Read_Master_Log_Pos 的差异，那么更加严谨的做法是同时在主库执行show master status和在从库上面执行show slave status 的输出进行比较。MHA就是这样保证数据一致性的。MMM都没有做到。这也算MHA比MMM更加优秀的地方。

#!/bin/bash
# 判断主从复制是否延迟
# write by yayun 2014-07-23
# http://www.cnblogs.com/gomysql/

# slave
s_psswd=123456
s_user=root
s_port=3306
s_host=localhost

# master
m_psswd=123456
m_user=root
m_port=3306
m_host=192.168.0.102


slave_wan_ip=`ifconfig | sed -n '/inet /{s/.*addr://;s/ .*//;p}' | head -n1`

while true
do
    sleep 1
    echo -e "\e[1;33m###################################\e[0m"
    Master_Log_File=$(mysql -u$s_user -p$s_psswd -h$s_host -P$s_port -e "show slave status\G" | grep -w Master_Log_File | awk -F": " '{print $2}')
    Relay_Master_Log_File=$(mysql -u$s_user -p$s_psswd -h$s_host -P$s_port -e "show slave status\G" | grep -w Relay_Master_Log_File | awk -F": " '{print $2}')
    Read_Master_Log_Pos=$(mysql -u$s_user -p$s_psswd -h$s_host -P$s_port -e "show slave status\G" | grep -w Read_Master_Log_Pos | awk -F": " '{print $2}')
    Exec_Master_Log_Pos=$(mysql -u$s_user -p$s_psswd -h$s_host -P$s_port -e "show slave status\G" | grep -w Exec_Master_Log_Pos | awk -F": " '{print $2}'|sed 's/[ \t]*$//g')
    Master_Log_File_Num=`echo $Master_Log_File | awk -F '.' '{print $2}' | sed 's/^0\+//'`
    Master_File=$(mysql -u$m_user -p$m_psswd -h$m_host -P$m_port -Nse "show master status" | awk '{print $1}')
    Master_Pos=$(mysql -u$m_user -p$m_psswd -h$m_host -P$m_port -Nse "show master status" | awk '{print $2}'|sed 's/[ \t]*$//g')
    Master_File_Num=`echo $Master_File | awk -F '.' '{print $2}' | sed 's/^0\+//'`

    if [ -z $Master_Log_File ] && [ -z $Relay_Master_Log_File ] && [ -z $Read_Master_Log_Pos ] && [ -z $Exec_Master_Log_Pos ]
    then
        echo -e "\e[1;31mSLAVE 没有取到值，请检查参数设置!\e[0m"
        exit 1
    fi

    if [ $Master_Log_File = $Relay_Master_Log_File ] && [ $Read_Master_Log_Pos = $Exec_Master_Log_Pos ]
    then
        if [ $Master_Log_File = $Master_File ] && [ $Exec_Master_Log_Pos = $Master_Pos ]
        then
            echo -e "\e[1;32mMaster-slave 复制无延迟 ^_^\e[0m"
        else
            if [ $Master_Log_File_Num -gt $Master_File_Num ] || [ $Master_Pos -gt $Exec_Master_Log_Pos ]
            then
                log_count=$(expr $Master_Log_File_Num - $Master_File_Num)
                pos_count=$(expr $Master_Pos - $Exec_Master_Log_Pos)
                echo -e "\e[1;31mMaster-slave 复制延迟 !!!\e[0m"
                echo -e "\e[1;31mMaster:$m_host Slave:$slave_wan_ip\e[0m"
                echo -e "\e[1;31mMaster当前binlog: $Master_File"
                echo -e "\e[1;31mSlave当前binlog:  $Master_Log_File"
                echo -e "\e[1;31mbinlog相差文件数: $log_count\e[0m"
                echo -e "\e[1;31mPos点相差:        $pos_count\e[0m"
            fi
        fi
    fi
done

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