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MySQL开源备份工具Xtrabackup备份部署

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Release: 2016-06-07 17:29:44
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Xtrabackup是一个对InnoDB做数据备份的工具,支持在线热备份(备份时不影响数据读写),是商业备份工具InnoDB Hotbackup的一个很好

  Xtrabackup是一个对InnoDB做数据备份的工具,支持在线热备份(备份时不影响数据读写),是商业备份工具InnoDB Hotbackup的一个很好的替代品。

  Xtrabackup有两个主要的工具:xtrabackup、innobackupex

  1、xtrabackup只能备份InnoDB和XtraDB两种数据表,而不能备份MyISAM数据表

  2、innobackupex是参考了InnoDB Hotbackup的innoback脚本修改而来的.innobackupex是一个perl脚本封装,封装了xtrabackup。主要是为了方便的 同时备份InnoDB和MyISAM引擎的表,但在处理myisam时需要加一个读锁。并且加入了一些使用的选项。如slave-info可以记录备份恢 复后,作为slave需要的一些信息,根据这些信息,可以很方便的利用备份来重做slave。
   
  Xtrabackup下载地址:
 
  选择合适的版本,,我这里选择binary。
 
  解压到/usr/src/目录,解压后目录名percona-xtrabackup-2.1.3,进入到bin目录,即可直接使用innobackupex命令
  # pwd
  /usr/src/percona-xtrabackup-2.1.3/bin
  # ls -l
  total 112396
  -rwxr-xr-x 1 root root  110738 Jun  7 11:43 innobackupex
  -rwxr-xr-x 1 root root  110738 Jun  7 11:43 innobackupex-1.5.1
  -rwxr-xr-x 1 root root  2211237 Jun  7 11:43 xbcrypt
  -rwxr-xr-x 1 root root  2285672 Jun  7 11:43 xbstream
  -rwxr-xr-x 1 root root 13033745 Jun  7 11:43 xtrabackup
  -rwxr-xr-x 1 root root 16333506 Jun  7 11:43 xtrabackup_55
  -rwxr-xr-x 1 root root 80988093 Jun  7 11:43 xtrabackup_56
 
  在开始使用的时候可能会报如下错误:
  sh: xtrabackup_55: command not found
  innobackupex: fatal error: no 'mysqld' group in MySQL options 

  解决办法xtrabackup_55复制到/usr/bin下即可。

  # cp /usr/src/percona-xtrabackup-2.1.3/bin/xtrabackup_55 /usr/bin/
 
 
  建立mysql备份用户:
  mysql> GRANT RELOAD, LOCK TABLES, REPLICATION CLIENT ON *.* TO 'backupuser'@'localhost' identified by 'skEBfef5E2';
  mysql> FLUSH PRIVILEGES;
   
备份脚本内容(每周一次全备,六次增量备份,保留2周的备份,并压缩):

#!/bin/bash
BEGINTIME=`date +"%Y-%m-%d %H:%M:%S"`
format_time=`date +"%Y-%m-%d_%H:%M:%S"`
week=`date +%w`
backupbin=/usr/src/percona-xtrabackup-2.1.3/bin
backdir=/data/databasebak/bak
file_cnf=/etc/my.cnf
user_name=backupuser
password="skEBfef5E2"
db="db1 db2 db3 db4"
out_log=$backdir/xtrabackup_log_$format_time
time_cost=$backdir/xtrabackup_time.txt

if [ -f "$backdir.lastlastlastweek.gz" ];then
        rm -rf $backdir.lastlastweek.gz
        mv $backdir.lastweek.gz $backdir.lastlastweek.gz
fi

if [ -d "$backdir/rec5" ];then
        gzip -cr $backdir >$backdir.lastweek.gz
        rm -rf $backdir         
        mkdir $backdir
fi
 
#full
if [ ! -d "$backdir/full" ];then
        echo "#####start full backup at $BEGINTIME to directory full" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" $backdir/full 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec0" ];then
        echo "#####start 0 incremental backup at $BEGINTIME to directory rec0" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/full $backdir/rec0 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec1" ];then
        echo "#####start 1 incremental backup at $BEGINTIME to directory rec1" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/rec0 $backdir/rec1 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec2" ];then
        echo "#####start 2 incremental backup at $BEGINTIME to directory rec2" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/rec1 $backdir/rec2 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec3" ];then
        echo "#####start 3 incremental backup at $BEGINTIME to directory rec3" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/rec2 $backdir/rec3 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec4" ];then
        echo "#####start 4 incremental backup at $BEGINTIME to directory rec4" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/rec3 $backdir/rec4 1> $out_log 2>&1
        break;
elif [ ! -d "$backdir/rec5" ];then
        echo "#####start 5 incremental backup at $BEGINTIME to directory rec5" >>$time_cost
        $backupbin/innobackupex --defaults-file=$file_cnf  --no-timestamp --user=$user_name --password=$password --slave-info --databases="$db" --incremental --incremental-basedir=$backdir/rec4 $backdir/rec5 1> $out_log 2>&1
        break;
 fi
 ENDTIME=`date +"%Y-%m-%d %H:%M:%S"`
 begin_data=`date -d  "$BEGINTIME" +%s`
 end_data=`date -d  "$ENDTIME" +%s`
 spendtime=`expr $end_data - $begin_data`
 echo "it takes $spendtime sec for packing the data directory" >>$time_cost

部署备份脚本;

# crontab -l

10 2 * * *  /opt/cron/mysqldbbakup.sh

恢复:

#全备恢复:

innobackupex --apply-log --redo-only  --defaults-file=$file_cnf --user=$user_name --password=$password    $backdir/full

#增备恢复,修改增量备份目录,逐个apply-log,到第五天的增量rec4都是输出都显示innobackupex: completed OK!

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