View source for Backup di una macchina Linux con rsyncd

La macchina client si collega via rsync ad un server che esegue rsyncd, e viene backuppata usando degli hard link per risparmiare spazio.
Vengono conservati gli ultimi 7 backup

==Server==

*Configurare rsyncd:
 
 sudoedit /etc/rsyncd.conf

<pre>
# cat /ffp/etc/rsyncd.conf 
log file = /mnt/HD_b2/backup/rsyncd.log
# percorso assoluto

use chroot = true
# per sicurezza

[sda1]
# Modulo per il primo disco
    uid = 0
    gid = 0
    # i files vengono trasferiti usando le credenziali di root
    path = /mnt/HD_b2/backup/sda1
    comment = Backup Juno sda1
    read only = false
    numeric ids = yes
    # usa gli id numerici per le permission, per evitare problemi di restore
    #fake super = yes
    # serve solo se rsyncd non è usato come root
    pre-xfer exec  = /mnt/HD_b2/backup/pretransfer > /mnt/HD_b2/backup/pretransfer.log
    # script da eseguire prima dell'inizio del trasferimento
    post-xfer exec = /mnt/HD_b2/backup/posttransfer > /mnt/HD_b2/backup/posttransfer.log
    # script da eseguire dopo la fine del trasferimento

[sda4]
    uid = 0
    gid = 0
    path = /mnt/HD_b2/backup/sda4
    comment = Backup Juno sda4
    read only = false
    numeric ids = yes
    #fake super = yes
    pre-xfer exec  = /mnt/HD_b2/backup/pretransfer > /mnt/HD_b2/backup/pretransfer.log
    post-xfer exec = /mnt/HD_b2/backup/posttransfer > /mnt/HD_b2/backup/posttransfer.log
</pre>

Questi sono gli script pre e post:

 sudoedit /mnt/HD_b2/backup/pretransfer

 #nulla

 sudoedit /mnt/HD_b2/backup/posttransfer

<pre>
# cat /mnt/HD_b2/backup/posttransfer
#!/bin/bash
# SHOWS all RSYNC variables
set | grep RSYNC_

#RSYNC_EXIT_STATUS=12
#RSYNC_HOST_ADDR=192.168.250.88
#RSYNC_HOST_NAME=juno.diesis.priv
#RSYNC_MODULE_NAME=sda1
#RSYNC_MODULE_PATH=/mnt/HD_b2/backup/sda1
#RSYNC_PID=7924
#RSYNC_RAW_STATUS=3072
#RSYNC_USER_NAME=

dstpath=$RSYNC_MODULE_PATH

if [ "RSYNC_EXIT_STATUS" = "0"  ]
then
        echo Linking $dstpath ...
        LAST_LINE=$(/bin/ls $dstpath -1 | grep '2[0-9][0-9][0-9][0-1][0-9][0-3][0-9]*' | sort | tail -n1)
        echo LAST_LINE=$LAST_LINE
        echo cd $dstpath
        echo rm -f current
        echo ln -s $LAST_LINE current

        echo Cleaning $dstpath ...
        TOTAL_LINES=$(/bin/ls $dstpath -1 | grep '2[0-9][0-9][0-9][0-1][0-9][0-3][0-9]*' | sort | wc -l)
        LINES_2DELETE=$(($TOTAL_LINES-7))
        DELETE=$(/bin/ls $dstpath -1 | grep '2[0-9][0-9][0-9][0-1][0-9][0-3][0-9]*' | sort | head -n $LINES_2DELETE)
        echo TOTAL_LINES=$TOTAL_LINES
        echo LINES_2DELETE=$LINES_2DELETE
        echo DELETE=$DELETE
        if [ -z "$DELETE" ]
        then
                for DIR in $DELETE
                do
                        echo Deleting  $dstpath/$DIR ...
                        echo rm -rf $dstpath/$DIR
                done
        else
                echo Nothing to clean.
        fi
else
        echo Last sync was unsuccesfull: not linking and not deleting.
fi
</pre>

==Client==

Creare lo script:
 sudoedit /home/diesis/local/bin/timemachine-sda1

<pre>
#!bin/bash
if [ $(id -u) != "0" ]
then 
	echo You must run 
	echo sudo $(basename $0)
	exit 1
fi

cd /

srcpath=.
dstpath=quantum::sda1
date=`date "+%Y%m%d_%H%M%S"`

rsync \
	-aivxP \
	--link-dest=../current \
	$srcpath \
	$dstpath/$date 2>&1
</pre>

Notare che il --link-dest è relativo al percorso effettivo di backup

Ora si lancia il backup:
 sudo /home/diesis/local/bin/timemachine-sda1


==Riferimenti==
* [http://markmail.org/message/plwfvbrdlwzrwp3u#query:link-dest%20daemon+page:1+mid:e7dgmmpg7qw6xd37+state:results --link-dest and file/dir transfer to remote rsync daemon - Alexander Grahn - org.samba.lists.rsync - MarkMail]
*[http://www.webos-internals.org/wiki/Backing_Up_via_Rsync Backing Up via Rsync - WebOS Internals]