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Centos使用tar命令做增量备份
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想给subversion做个自动备份的脚本，一看目录大小，已经有几十个G了。
天天做完整备份太费系统资源了，增量备份是一个很好的解决方案。
每周做一次完整备份，然后每天只做增量备份。
Centos做增量备份还是很容易的，tar命令就可以完全胜任。
在cron里设置,每周日晚执行(每周日全备份,其余时间增量备份)。
示例一：
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#!/bin/bash # define dayofweek=`date "+%u"` today=`date "+%Y%m%d"` source=/data/ backup=/backup/ # action cd $backup if [ $dayofweek -eq 1 ]; then if [ ! -f "full$today.tar.gz" ]; then rm -rf snapshot tar -g snapshot -zcf "full$today.tar.gz" $source fi else if [ ! -f "inc$today.tar.gz" ]; then tar -g snapshot -zcf "inc$today.tar.gz" $source fi fi |
示例二:
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#!/bin/bash # simple backup script. intended to run daily from crontab # called "biedacula" after "bieda", which is Polish word for "poor". # implements poor man's GFS scheme, hence the name:) # requires GNU tar, GNU gzip and ncftp # these files must contain file/dir paths (one a line) PATHFILE=/etc/backup-defs SKIPFILE=/etc/backup-excludes # this is a snapshot file auto-created by GNU tar SNAPSHOT=/etc/backup-snapshot # FTP host to send backups ( must allow anonymous RW access for me ) FTPHOST=192.168.1.118 FTPPORT=21 # when to do full, monthly/weekly backups FULL_MONTHDAY=1 # 1st day of month FULL_WEEKDAY=7 # Sunday # how many "tapes" for monthly backups KEEP_MONTHLY=3 # how many "tapes" for weekly backups KEEP_WEEKLY=4 # in total you will have ( KEEP_MONTHLY + KEEP_WEEKLY + 6 ) "tapes" function biedump { local TYPE=$1 local LABEL=$2 local start=`date +%Y%m%d%H%M` echo "$start: Starting $TYPE dump to label $LABEL" if [ "x$TYPE" == "xfull" ] ; then rm -rf $SNAPSHOT fi tar -c -T$PATHFILE -X$SKIPFILE -g$SNAPSHOT -P -f - \ | gzip \ | ncftpput -c -S.tmp -P $FTPPORT $FTPHOST $LABEL local res=$? local end=`date +%Y%m%d%H%M` if [ $res -eq 0 ]; then echo "$end: $TYPE dump OK." else echo "$end: $TYPE dump FAILED with exit code $res." fi } host=`hostname -f` yyyy=`date +%Y` mm=`date +%m` dd=`date +%d` ww=`date +%V` day_of_week=`date +%u` dayofweek=`date +%a` echo "Hello. This is biedacula backup running at $host." echo "Today is $yyyy/$mm/$dd, day $day_of_week ($dayofweek) of week $ww." if [ $dd -eq $FULL_MONTHDAY ]; then let " n = ( mm % $KEEP_MONTHLY ) + 1 " biedump 'full' "$host-M-$n.tgz" elif [ $day_of_week -eq $FULL_WEEKDAY ] ; then let " n = ( ww % $KEEP_WEEKLY ) + 1 " biedump 'full' "$host-W-$n.tgz" else biedump 'incr' "$host-D-$dayofweek.tgz" fi |
前几天刚刚装了centos6，可以试一试~