nixCraft

puppen · #1 (**permalink**) 21-04-2006, 11:40 PM

Dear All.

I require a shell script using rsync. I have two Linux servers both are identical. I want to copy data from one server to another server in every 1 hour using rsync and I want to put in Cron Script.

I tried this but when I do rsync it asks for password even I give --password-file option but no luck.

Example :- rsync -avz server1:/mail server2:/mail
I wan to put this in cron scheduler , so it copy all data every day in a gap of one hour and this script should start every day after 6: PM and stop at 2 AM .

Regards.
Puppen

nixcraft · #2 (**permalink**) 22-04-2006, 12:41 AM

Replace your rsync command (assuming that you want to sync server1 with local server2)

Code:

rsync -avz server1:/mail server2:/mail

with (type command on server2)

Code:

rsync -avrR --links --rsh=/usr/bin/ssh server1:/mail :/mail

To avoid password prompt you need to setup ssh-keys, so on server2 type following commands:

Code:

ssh-keygen -t rsa
ssh you@server1 "mkdir .ssh"
scp .ssh/id_rsa.pub you@server1:.ssh/authorized_keys2

Now you can login to server1 from server2 without password. Now setup cron job using following script (save script on server2):

Code:

#!/bin/bash
MASTER="server1"
DIR="/mail"
LDIR="/mail"
SSH="/usr/bin/ssh"
rsync -avrR --links --rsh=$SSH $MASTER:$DIR $LDIR

Cron job
Setup cronjob using following syntax:

Code:

1 18,19,20,21,22,23,0,1,2 * * * /path/to/script.sh

Script.sh will run at 6:01pm, 7:01pm, 8:01pm ... 2:01am

Read following docs for more info:

How do I add jobs to cron under Linux or UNIX oses
SSH Public key based authentication - How-to?
How do I sync data between two Load balanced Linux/UNIX servers?

if you have more question just reply back and we will be glad to assist you

puppen · #3 (**permalink**) 22-04-2006, 02:38 AM

Dear

Thanks a bunch for reply.
But I am confused between 2 servers and which command runs on which server.
Currently what I am doing is,
I am running this command on server2 where I am taking back up i.e on server2
rsync -avz server1:/mail /mail
the above command copy files from server1 to server2

One more thing I have so many dir in mail folder but I do not want to take backup of all dir except certain dir. in this case what should I do/

Regards.
Puppen

rockdalinux · #4 (**permalink**) 22-04-2006, 11:28 AM

Quote:

One more thing I have so many dir in mail folder but I do not want to take backup of all dir except certain dir. in this case what should I do/

Use --exclude option

Code:

rsync -avz --exclude '/mail/rocky' server1:/mail /mail

Above command will not include /mail/rocky directory. If you have lots of dir then you can store them in file. For example:

file.txt

Code:

/mail/rocky
/mail/xyz
/mail/dddd

And your command should be as follows:

Code:

rsync -avz --exclude-from file.txt server1:/mail /mail

Hope this helps

puppen · #5 (**permalink**) 23-04-2006, 12:52 AM

Dear All
Thanks a bunch, Ya I have got it. This script works properly.

regards.
Puppen

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Require shell script using rsync

Require shell script using rsync

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