MySQL 备份脚本--mysqldump在slave 上进行备份

MySQL 备份脚本--mysqldump在slave 上进行备份

使用mysqldump在slave上进行备份，建议使用stop slave sql_thread,start slave sql_thread,

在slave上进行mysqldump备份的时候（--single-transaction），这时候如果主库对表发生ddl，从库的mysqldump备份可能会发生错误，table definition has changed,pelase try transaction.mysqldump终止

#!/bin/sh
#create by hq on 20160531

show_slave_status(){
        echo -e"-----master.info:-----" >>${LOG_FILE}
        cat ${MAIN_PATH}/data/master.info | sed -n '2,3p' >>${LOG_FILE}
        echo -e"----show slave status:----">>${LOG_FILE}
        echo "show slave status\G" |${MYSQL_CMD} | egrep "Slave_IO_Running|Slave_SQL_Running|Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos|Relay_Log_File|Relay_Log_Pos" >>${LOG_FILE}
        echo -e "" >> ${LOG_FILE}
    }
source /data/mysqldata/scripts/mysql_env.ini
HOST_PORT=3306
HOST_IP=127.0.0.1
MAIN_PATH=/data/mysqldata/${HOST_PORT}
DATA_PATH=/data/mysqldata/backup/mysql_full
DATA_FILE=${DATA_PATH}/dbfullbk_`date +%F`.sql.gz
LOG_FILE=${DATA_PATH}/dbfullbk_`date +%F`.log
MYSQL_PATH=/usr/local/mysql/bin
MYSQL_CMD="${MYSQL_PATH}/mysql -u${MYSQL_USER} -p${MYSQL_PASS} -h${HOST_IP} -P${HOST_PORT} -S ${MAIN_PATH}/mysql.sock"
MYSQL_DUMP="${MYSQL_PATH}/mysqldump -u${MYSQL_USER} -p${MYSQL_PASS} -h${HOST_IP} -P${HOST_PORT} -A -R -S ${MAIN_PATH}/mysql.sock --single-transaction"

echo > ${LOG_FILE}
echo -e "====jobs started at `date +%F' '%T' '%w`====\n">>${LOG_FILE}

if [ ! -d ${DATA_PATH} ]; then
 mkdir -p ${DATA_PATH}
 echo -e "===`${DATA_PATH}` does not exsits,created them!" >> ${LOG_FILE}
fi

echo -e "**** started postion===:" >>${LOG_FILE}
echo "stop slave SQL_THREAD;"| ${MYSQL_CMD}
show_slave_status

echo -e "**** executed command:${MYSQL_DUMP} |gzip > ${DATA_FILE}">>${LOG_FILE}
${MYSQL_DUMP} | gzip >${DATA_FILE}
echo -e "**** execute finished at `date +%F' '%T' '%w`"==== >>${LOG_FILE}
echo -e "**** backup file size:`du -sh ${DATA_FILE}`====\n" >>${LOG_FILE}

echo -e "**** recheck position====">>${LOG_FILE}
show_slave_status
echo "start slave SQL_THREAD;" | ${MYSQL_CMD}

echo -e "----find expired backup and delete those file ---" >>${LOG_FILE}
for tfile in $(/usr/bin/find ${DATA_PATH} -mtime +30)
do
  if [ -d $tfile ] ; then
      rmdir $tfile
  elif [ -f $tfile ] ; then
      rm -f $tfile
  fi

   echo -e "---- delete file :$tfile---" >>${LOG_FILE}
done

echo -e "\n===jobs ended at `date +%F' '%T' '%w` ====\n ">>${LOG_FILE}