基于Innobackupex的MySQL备份脚本
Innobackupex是Xtrabackup的一部分，其实质也是调用xtrabackup。主要的不同是Xtrabackup除了支持innodb引擎外还支持xtradb引擎。本文主要封装了Innobackupex到shell脚本进行定期备份，供大家参考。
1、脚本描述
a、支持增量备份以及全备
b、需要传递到备份脚本(如备份路径，连接相关参数等)
c、基于周日，周三的全量备份，其他增量备份
d、可根据需要调整脚本，比如压缩备份的文件夹以及rsync等
2、脚本内容
#!/bin/bash
#set -x
# Get the key value of input arguments format like '--args=value'.
function get_key_value()
{
echo "$1" | sed 's/^--[a-zA-Z_-]*=//'
}
# Usage will be helpful when you need to input the valid arguments.
function usage()
{
cat <<EOF
Usage: $0 [configure-options]
-?, --help Show this help message.
--backup-dir=<> Set backup directory
--defaults-file=[] Set mysql configuration file directory
--host=<> Set mysql host
--port=<> Set mysql port
--user=<> Set mysql user name
--password=<> Set mysql user password
EOF
}
# Parse the input arguments and get the value of the input argument.
if [ $# -eq 0 ];then
usage
# print_default
exit 0;
fi
function parse_options()
{
while test $# -gt 0
do
case "$1" in
--backup-dir=*)
backupDir=`get_key_value "$1"`;;
--defaults-file=*)
defaultFile=`get_key_value "$1"`;;
--host=*)
Host=`get_key_value "$1"`;;
--port=*)
mysqlPort=`get_key_value "$1"`;;
--user=*)
mysqlUser=`get_key_value "$1"`;;
--password=*)
mysqlPassword=`get_key_value "$1"`;;
-? | --help )
usage
# print_default
exit 0;;
*)
echo "Unknown option '$1'"
exit 1;;
esac
shift
done
}
# Call the parse_options function to parse the input arguments and initialisze env.
parse_options "$@"
physicalBackupDir=${backupDir}/physical
logDir=${backupDir}/log
checkPointDir=${backupDir}/checkpoint
cmdInno=/usr/bin/innobackupex
sock=/tmp/mysql.sock
day=`date +%w`
lastday=`date -d '1 days ago' +%Y%m%d`
dt=`date +%Y%m%d`
ts=`date +%Y%m%d%H%M%S`
logFile=${backupDir}/log/innobak_${ts}.log
if [ "${day}" -eq 0 ] || [ "${day}" -eq 3 ];then
if [ ! -d "$physicalBackupDir/$dt" ];then
echo "mkdir -p $physicalBackupDir/$dt"
mkdir -p $physicalBackupDir/$dt
fi
fi
if [ -z "$defaultFile" ]; then
defaultFile=/etc/my.cnf
fi
if [ ! -d "${logDir}" ]; then
mkdir -p ${logDir}
fi
if [ ! -d "${checkPointDir}" ]; then
mkdir -p ${checkPointDir}
fi
echo "Start innobackup at `date`." >>${logFile}
echo "Current defaults file is : ${defaultFile}" >>${logFile}
echo "Current host is : ${Host}" >>${logFile}
echo "Current port is : ${mysqlPort}" >>${logFile}
echo "Current mysql user is : ${mysqlUser}" >>${logFile}
echo "Current password is : ${mysqlPassword}"
echo "Current log directory is : ${logDir}" >>${logFile}
echo "Current log file is : ${logFile}" >>${logFile}
# Define backup function for full and incremental backup type.
function back_full()
{
echo "$cmdInno --user=$mysqlUser --password=$mysqlPassword --no-timestamp \
--defaults-file=$defaultFile $physicalBackupDir/$dt/base_${dt} \
--socket=$sock 2> ${logDir}/bak_$ts.log" >>${logFile}
$cmdInno --user=$mysqlUser --password=$mysqlPassword --no-timestamp \
--defaults-file=$defaultFile $physicalBackupDir/$dt/base_$dt --socket=$sock 2> ${logDir}/bak_${ts}.log
grep last_lsn $physicalBackupDir/$dt/base_$dt/xtrabackup_checkpoints|cut -b 12- >$checkPointDir/ckp_${dt}
}
function back_inc()
{
echo " $cmdInno --user=$mysqlUser --password=$mysqlPassword --socket=$sock --no-timestamp \
--defaults-file=$defaultFile --incremental $basedir/inc_$dt \
--incremental-lsn=`cat $checkPointDir/ckp_$lastday` 2>${logDir}/bak_${ts}.log " >>${logFile}
$cmdInno --user=$mysqlUser --password=$mysqlPassword --port=${mysqlPort} --socket=$sock --no-timestamp \
--defaults-file=$defaultFile --incremental $basedir/inc_$dt \
--incremental-lsn=`cat $checkPointDir/ckp_$lastday` 2>${logDir}/bak_${ts}.log
grep last_lsn $basedir/inc_$dt/xtrabackup_checkpoints|cut -b 12- >$checkPointDir/ckp_$dt
}
case $day in
0)
# Sunday Full backup
back_full
;;
1)
# Monday Relatively Sunday's incremental backup
basedir=$physicalBackupDir/`date -d "1 days ago" +%Y%m%d`
back_inc
;;
2)
# Tuesday Compared with Monday's incremental backup
basedir=$physicalBackupDir/`date -d "2 days ago" +%Y%m%d`
back_inc
;;
3)
# Wednesday Full backup
back_full
;;
4)
# Thursday Relatively Wednesday's incremental backup
basedir=$physicalBackupDir/`date -d "1 days ago" +%Y%m%d`
back_inc
;;
5)
# Friday Compared with Thursday's incremental backup
basedir=$physicalBackupDir/`date -d "2 days ago" +%Y%m%d`
back_inc
;;
6)
# Saturday Compared with Friday's incremental backup
basedir=$physicalBackupDir/`date -d "3 days ago" +%Y%m%d`
back_inc
;;
esac
# Check backup log ,remove history logfile and bacupset.
retention=5
find ${physicalBackupDir} -type f -mtime +$retention -exec rm {} \;
find ${logDir} -type f -mtime +$retention -exec rm {} \;
# Send mail for backup result.
echo "" >>${logFile}
echo "Below is detail log for current innobackup.">>${logFile}
cat ${logDir}/bak_${ts}.log >>${logFile}
mailadd='[email protected],[email protected]'
if [ -e "${logFile}" ]; then
status=`grep -i "innobackupex: completed OK!" ${logFile}`
if [ -n "${status}" ]; then
cat ${logFile} |mutt -s "Successful backup for MySQL hotbackup on `hostname`." $mailadd
else
cat ${logFile} |mutt -s "Failed backup for MySQl hotbackup on `hostname`." $mailadd
fi
else
echo "The hotbackup logfile was not found on `hostname`." | \
mutt -s "Failed backup for MySQl hotbackup on `hostname`." $mailadd
fi
exit
3、调用示例
SHELL> more call_innobk.sh
#!/bin/bash
/db_scripts/innobk.sh --backup-dir=/data/backup --host=127.0.0.1 --port=3306 --user=innobk --password=InnoBK
SHELL> crontab -l
0 3 * * * /db_scripts/call_innobk.sh
SHELL> cd /data/backup
SHELL> ls
checkpoint log physical
SHELL> cd physical/
SHELL> ls
20141228 20141231 20150104 20150107
SHELL> cd 20150107
SHELL> ls -hltr
total 16K
drwxr-xr-x 9 root root 4.0K Jan 7 03:05 base_20150107 #全备
drwxr-xr-x 9 root root 4.0K Jan 8 03:04 inc_20150108 #增备
drwxr-xr-x 9 root root 4.0K Jan 9 03:03 inc_20150109 #增备
drwxr-xr-x 9 root root 4.0K Jan 10 03:03 inc_20150110 #增备
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