脚本解决mysql从库宕机，导致同步主键冲突

mysql从库宕机，再次启动之后，一直提示1062同步主键冲突，这个时候我们需要手动跳过在mysql的命令行中执行"set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;"，进行一次跳过。但是一般情况下需要执行很多次，以下用脚本检测1062主键冲突，然后自动跳过。

cat mysql_skip_1062.sh

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## 如果同步的过程中，出现重复记录导致同步失败，就跳过

LOGFILE=log.mysql_skip_1062

SQLCMD1="show slave status"

user_password="-uroot -p123321"

while true

do

  IO_STATUS=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Slave_IO_Running:" {print $2}'`

  SQL_STATUS=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Slave_SQL_Running:" {print $2}'`

  #BEHIND_STATUS=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Seconds_Behind_Master:" {print $2}'`

  #SLAVE_BINLOG1=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Master_Log_File:" {print $2}'`

  #SLAVE_BINLOG2=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Relay_Master_Log_File:" {print $2}'`

  ERROR_NUM=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Last_Errno:" {print $2}'`

  ## 出现错误，就将错误信息记录到日志文件，并跳过错误继续同步

  if [[ "${IO_STATUS}" != "Yes" || "${SQL_STATUS}" != "Yes" ]]; then

    ERRORINFO=`mysql ${user_password} -e "${SQLCMD1}\G;" | awk '$1=="Last_Error:" {print $2_$3_$4_$5}'`

    echo "${ERRORINFO}"

    echo "${ERRORINFO}" >> ${LOGFILE}

    if [[ "${ERROR_NUM}" == "1062" ]]; then

      echo "do something for: ${ERROR_NUM}"

      mysql ${user_password} -e "stop slave;"

      mysql ${user_password} -e "set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;"

      mysql ${user_password} -e "start slave;"

    fi

    sleep 2

  ## 已完成同步，就正常退出

  elif [[ "${IO_STATUS}" = "Yes" && "${SQL_STATUS}" = "Yes" && "${SLAVE_BINLOG1}" = "${SLAVE_BINLOG2}" && ${BEHIND_STATUS} -eq 0 ]]; then

    echo The MySQL synchronous is ok at: `date +%F" "%H-%M-%S` >> ${LOGFILE}

    break

  fi

done

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