Today we are going to
discuss over "how to use rsync command over ssh to take backup of
files". Before that let's know little bit about rsync itself.
rsync :
rsync is a little Linux utility that synchronizes filesystems from one
place to another by only copying diffs (deltas) of files that have changed. rsync optionally compresses the files ont-the-fly before transfer (to save
transfer time) and may be used in conjunction with rsh or ssh to perform remote
file transfers. rsync may be used as a backup or mirroring utility.
The advantage of using rsync
over other archive and copy utilities such as tar, dump and rcp are:
(1) rsync can use ssh as a
secure channel to transfer files over the network.
(2) It provides an ability
to retain ownership and permission of files being transferred.
(3) It enables files and
directories to be synchronized (deleted files are deleted from the last
replication), and
(4) transfers only
"delta" files that are changed from last replication making transfer
much faster.
If rysnc is used without the
ssh, it uses the TCP port 873.
To more about rsync command
you can follow these links
You can run rsync command as
follow :
Example :
rsync -iavz
--log-file=/usr/dirtyhandsphp/backups/`date +%d%b%Y`_rsync.log -e ssh
/var/www/manual /usr/dirtyhandsphp/backups/backup_`date +%d%b%Y`
--log-file : saves a copy of the rsync result to a
logs_date-stamped file.
-a : archive mode
-v : verbose mode
-z : Compress files before transfer
It would copy manual folder
and it's files from /var/www/
to /usr/dirtyhandsphp/backups/backup_`date
+%d%b%Y`. Files would get copied in compressed mode and a logfile with
nominature `date +%d%b%Y`_rsync.log
would be created in /usr/dirtyhandsphp/backups/
directory.
Note : If you are running this command
from backend and not going with logs file option then there is no need of using
verbose (-v) mode.
How to check if rsync ran successfully or not :
rsync command returns an exit code after execution. You
can check exit codes list here :
If it returns no code it
means it ran successfully without any problem so code is 0. Otherwise it would
return a particular code. If you are writing a shell script which would be
exected automatically at a particular time from back-end and want to put some
logic on success or failure of the command. You can do as following :
#!/bin/bash
rsync -iavz --log-file=/usr/dirtyhandsphp/backups/`date +%d%b%Y`_rsync.log -e ssh /var/www/manual /usr/dirtyhandsphp/backups/backup_`date +%d%b%Y`
if [
"$?" = "0" ] ; then
#echo
"Backup Completed
else
#echo
"Backup Failed"
fi
exit
Thanks!!!!!!!!! Enjoy
Programming :)
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