基于XtraBackup的备份有效性检查脚本
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生产环境的mysql是通过crontab的方式,定时调度热备脚本备份数据。目前是通过XtraBackup软件实现热备。关于热备脚本方面,请查看我原先的博客《使用shell实现mysql自动全备、增备&日志备份》:http://linzhijian.blog.51cto.com/1047212/1891745 ,这里不再展开说明。
备份存放:通过XtraBackup的流式备份,将备份异地存放到备份服务器上。
备份策略:周日热备,周一到周六增备。
目前缺漏:这些备份数据未能实现有效性检查,无法探知这些备份是否具有可用性,需要通过一定的机制实现有效性检测。
目前在备份机的备份文件列表如下:
drwxr-xr-x 18 mysql mysql 4096 Apr 9 03:28 mysql01_20170409_023001_full drwxr-xr-x 18 mysql mysql 4096 Apr 10 03:25 mysql01_20170410_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 11 03:26 mysql01_20170411_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 12 03:25 mysql01_20170412_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 13 03:26 mysql01_20170413_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 14 03:26 mysql01_20170414_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 15 03:27 mysql01_20170415_023001_incr drwxr-xr-x 18 mysql mysql 4096 Apr 16 03:29 mysql01_20170416_023001_full drwxr-xr-x 18 mysql mysql 4096 Apr 17 03:26 mysql01_20170417_023001_incr
其中full结尾的说明当天是全备的,incr结尾的说明当天是增备的。
脚本实现逻辑:自动恢复全备数据,并依次恢复其余的增备数据到全备数据中,最后将恢复完毕的全备数据用mysqld拉起来,检查MySQL的错误日志是否有异常报错来判断恢复是否正常。
vim mysql_recover.sh
#!/bin/sh hostname=$1 week=`date +%w` ##获取当天是周几。 time1=`date +%s` timestamp=`date +%Y%m%d%H%M%S` logdir="/home/mysql/log/mysqlrecoverlog/$hostname/" dir="/mysqlbackup/databak/$hostname/" fullname="$dir/full_backup_file.txt" ##记录全备的路径名 incrname="$dir/incr_backup_file.txt" ##记录当天要恢复的增备的路径名 today=`date +%Y%m%d` datadir="/mysqlbackup/mysql_test/$hostname/data" n1="1" ##周几做热备,周一到周六为1~6,周日为0。 n2="6" ##周几最后一次增备,周一到周六为1~6,周日为0。 ###getdir()函数是获取脚本运行当天的热备文件的路径名,并做校验(一天一个备份文件)### function getdir() { if [ $week -eq "$n1" ] then fulldir=`find /mysqlbackup/databak/${hostname}/ -type d -name "*${today}*full"` if [ ! -n "$fulldir" ] then echo "the fulldir not exist!!!" >> $logdir/recover_${timestamp}.log exit 1 fi num=`find /mysqlbackup/databak/${hostname}/ -type d -name "*${today}*full"|wc -l` if [ $num -eq "1" ] then echo $fulldir > $fullname else echo "there are not only full dbbackup in $today, please check!!!" >> $logdir/recover_${timestamp}.log exit 1 fi else incrdir=`find /mysqlbackup/databak/${hostname}/ -type d -name "*${today}*incr"` if [ ! -n "$incrdir" ] then echo "the incrdir not exist!!!" >> $logdir/recover_${timestamp}.log fi num=`find /mysqlbackup/databak/${hostname}/ -type d -name "*${today}*incr"|wc -l` if [ $num -eq "1" ] then echo $incrdir > $incrname else echo "there are not only incr dbbackup in $today, please check!!!" >> $logdir/recover_${timestamp}.log exit 1 fi fi } ##由于采用流式备份,备份文件需要先行解压。umcompress函数就是解压函数#### function uncompress() { dir=$1 /usr/bin/innobackupex --decompress --parallel=8 $dir >>$logdir/uncompress_${timestamp}.log 2>&1 success_flag=`cat $logdir/uncompress_${dir}_${timestamp}.log|grep "completed OK"` if [ -n success_flag ] then echo "$dir decompress sucessfully!" >> $logdir/recover_${timestamp}.log else echo "$dir decompress failed " >> $logdir/recover_${timestamp}.log exit 1 fi } ###恢复全量备份函数## function full_recover() { fullbakdir=$1 uncompress $fullbakdir /usr/bin/innobackupex --use-memory=2G --apply-log --redo-only $fullbakdir >>$logdir/full_recover_${timestamp}.log 2>&1 success_flag=`cat $logdir/full_recover_${timestamp}.log|grep "innobackupex: completed OK"` #failed_flag=`cat $logdir/full_recover_${timestamp}.log|grep "xtrabackup: error:"` if [ -n "$success_flag" ] then echo "the full dbbackup $fullbakdir recovery is success!" >> $logdir/recover_${timestamp}.log else echo "the full dbbackup $fullbakdri recovery is fail!" >> $logdir/recover_${timestamp}.log exit 1 fi } ###恢复增量备份函数### function incr_recover() { incrbakdir=$1 fullbakdir=$2 uncompress $incrbakdir uncompress $fullbakdir if [ $week -ne "$n2" ] then /usr/bin/innobackupex --use-memory=2G --apply-log --redo-only --incremental-dir=$incrbakdir $fullbakdir >>$logdir/incr_recover_${timestamp}.log 2>&1 else /usr/bin/innobackupex --use-memory=2G --apply-log --incremental-dir=$incrbakdir $fullbakdir >>$logdir/incr_recover_${timestamp}.log 2>&1 fi #/usr/bin/innobackupex --use-memory=2G --apply-log --redo-only --incremental-dir=$incrbakdir $fullbakdir >>$logdir/incr_recover_${timestamp}.log 2>&1 success_flag=`cat $logdir/incr_recover_${timestamp}.log|grep "innobackupex: completed OK"` #failed_flag=`cat $logdir/incr_recover_${timestamp}.log|grep "xtrabackup: error:"` if [ -n "$success_flag" ] then echo "the incr dbbackup $fullbakdir recovery is success!" >> $logdir/recover_${timestamp}.log else echo "the incr dbbackup $fullbakdri recovery is fail!" >> $logdir/recover_${timestamp}.log exit 1 fi } getdir if [ $week -eq "$n1" ] then full=`cat $fullname` full_recover $full else incr=`cat $incrname` full=`cat $fullname` incr_recover $incr $full fi time2=`date +%s` times=$((${time2}-${time1})) echo "it takes $times seconds to finish the recover!!!" >> $logdir/recover_${timestamp}.log
本文出自 “林志坚的博客” 博客,请务必保留此出处http://linzhijian.blog.51cto.com/1047212/1916616
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