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：周日全备，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 dbrecover.sh
#!/bin/sh if [ $# -ne 1 ] then echo "usage: `basename $0` [mysql01|mysql02]" exit 1 fi hostname=$1 today=`date +%Y%m%d` sh /home/mysql/shell/mysql_recover.sh $hostname $today
vim mysql_recover.sh
#!/bin/sh
if [ $# -ne 2 ]
then
echo "usage: `basename $0` [mysql01|mysql02|mysql03] 20170501 "
exit 1
fi
hostname=$1
#hostname="mysql02"
#today=`date +%Y%m%d`
today=$2
#week=`date +%w`
week=`date -d $today +%w`
time1=`date +%s`
timestamp=`date +%Y%m%d%H%M%S`
logdir="/home/mysql/log/mysqlrecoverlog/$hostname/$timestamp"
dir="/mysqlbackup/databak/$hostname/"
fullname="$dir/full_backup_file.txt"
incrname="$dir/incr_backup_file.txt"
datadir=`grep datadir /etc/my.cnf|awk -F \= '{print $NF}'`
errlog=`grep log-error /etc/my.cnf|awk -F \= '{print $NF}'`
n1="0" ##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。
mkdir $logdir ##创建日志目录
function getdir()
{
if [ $week -eq "$n1" ]
then
fulldir=`find /mysqlbackup/databak/${hostname}/ -type d -name "*${today}*full"`
#/mysqlbackup/databak/mysql01/mysql01_20170430_023001_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`
#/mysqlbackup/databak/mysql01/mysql01_20170429_023001_incr
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
}
function uncompress()
{
dir=$1
/usr/bin/innobackupex --decompress --parallel=8 $dir >>$logdir/uncompress_${timestamp}.log 2>&1
success_flag=`cat $logdir/uncompress_${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
}
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"`
if [ -n "$success_flag" ]
then
echo "the full dbbackup $fullbakdir recovery is success!" >> $logdir/recover_${timestamp}.log
else
echo "the full dbbackup $fullbakdir recovery is fail!" >> $logdir/recover_${timestamp}.log
exit 1
fi
}
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
success_flag=`cat $logdir/incr_recover_${timestamp}.log|grep "innobackupex: completed OK"`
if [ -n "$success_flag" ]
then
echo "the incr dbbackup $incrbakdir recovery is success!" >> $logdir/recover_${timestamp}.log
else
echo "the incr dbbackup $incrbakdir recovery is fail!" >> $logdir/recover_${timestamp}.log
exit 1
fi
}
function mysqlrecover()
{
fullbakdir=$1
#uncompress $fullbakdir
rm -fr $datadir
/bin/ln -s $fullbakdir $datadir
chown -R mysql:mysql $datadir
chown -R mysql:mysql $fullbakdir
/sbin/service mysqld start
error_flag=`grep -i error $errlog`
if [ -z "$error_flag" ]
then
echo "the mysqld don't report error, mysql recover is success!" >> $logdir/recover_${timestamp}.log
else
echo "the mysqld report error, mysql recover is fail, please check!" >> $logdir/recover_${timestamp}.log
exit 1
fi
/sbin/service mysqld stop
}
getdir
if [ $week -eq "$n1" ]
then
full=`cat $fullname`
full_recover $full
else
incr=`cat $incrname`
full=`cat $fullname`
incr_recover $incr $full
if [ $week -eq "$n2" ]
then
mysqlrecover $full
fi
fi
time2=`date +%s`
times=$((${time2}-${time1}))
echo "it takes $times seconds to finish the recover!!!" >> $logdir/recover_${timestamp}.log
备份机目前采用二进制包安装MySQL的方式，直接上传到/usr/local/mysql目录上，配置好相应的/etc/profile和/etc/my.cnf即可。
cat /etc/my.cnf
[mysqld] datadir=/mysqlbackup/mysql_test socket=/mysqlbackup/mysql_test/mysql.sock user=mysql # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 [mysqld_safe] log-error=/mysqlbackup/mysql_test/mysqld.log pid-file=/mysqlbackup/mysql_test/mysqld.pid
生成的日志文件如下：
-rw-r--r-- 1 root root 613918 May 4 09:34 incr_recover_20170504092501.log -rw-r--r-- 1 root root 307 May 4 09:34 recover_20170504092501.log -rw-r--r-- 1 root root 259310 May 4 09:26 uncompress_20170504092501.log
其中：
uncompress_20170504092501.log：解压备份文件时产生的日志信息
incr_recover_20170504092501.log：XtraBackup应用备份文件时产生的日志信息
recover_20170504092501.log：当次恢复备份文件记录的简要日志信息
