topic Re: remote backup in Operating System - Linux

remote backup

Fadia Almarei — Tue, 23 Mar 2004 07:42:12 GMT

hi all

i want to ask if i have a tap drive on a devise and i want to make backup on a tape for another device in the network what the command to do that ,and please what is the command if i have solaris system and HP system

thanks

Re: remote backup

Mark Grant — Tue, 23 Mar 2004 07:46:59 GMT

You can't write directly to a tape device on another machine. You used to be able to do this with RFS but Sun won that little battle with NFS :)

However, a simple way to achieve the same thing is to make all the data you want to backup available on the machine with the tape drive.

Expensive backup software like Data Protector achieves this by having an agent running on both machines and the one without the tape drive simply sends the data to the agent on the machine that has the tape drive.

The simple way, however, is to just NFS mount the file system from the machine without the drive to the other and then you can back it up as if the data was local.

Re: remote backup

Martin P.J. Zinser — Tue, 23 Mar 2004 14:00:19 GMT

Hi,

and if you want to get slightly more sophisticated without spending big bucks (or rather any) checkout Amanda.

http://www.amanda.org/

Greetings, Martin

Re: remote backup

Paul Cross_1 — Tue, 23 Mar 2004 16:37:48 GMT

What happened to:

#dump -0fu host:/dev/rmt/0n

??

Re: remote backup

Thomas Bianco — Wed, 24 Mar 2004 10:52:58 GMT

you could do the old standby:

rexec "tar / -" > /dev/tape

above is symbolic, obviously, as i am too tired to think of the correct command line or device files.

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 01:23:30 GMT

in another way if i want to backup a Linux 9 system on a tape ,but the tape drive found in an HP or Solaris system what the way to do the backup

thanks

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 01:44:43 GMT

Put the filesystems you want to back up in /etc/exports on the linux box. Entries should look something like this

/home *(rw,no_root_squash)

THen type "exportfs -a"

On the HP/Solaris go

mount :/home /mnt

Then backup /mnt. Obviously adjust filesystem names to suit.

When you have finished, on the HP/solaris do

umount /mnt

And on the Linux box

exportfs -a -u

Ignore the error messages

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 02:02:39 GMT

what you mean with a " rw,no_root_squash) " and what is the linux box

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 02:21:12 GMT

when i put exportfs ,it give me error message as the following
"exportfs: No 'sync' or 'async' option specified for export "*:/home".
Assuming default behaviour ('sync').
NOTE: this default has changed from previous versions"

what to do

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 02:23:47 GMT

I thought you wanted to backup a linux machine (Linux 9 you called it), so the linux box, is this machine.

The "no_root_squash" is to allow root access on the HP/Solaris machine, you don't need it but you do neet the barckets so it could look like this in /etc/exports

/home *()

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 02:25:32 GMT

fadia,

Simplyfy it. Make it

/home *()

As mentioned in my previous post and then try "exportfs -a"

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 02:34:53 GMT

sorry again i have the same message as previous ,please give me more details

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 02:48:49 GMT

Don't worry about it. It should still work

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 03:06:46 GMT

i think that i really annoy you ,but i want to understant , when i mount my linux system and then want to backup when i write the tar it will be

tar -cvf /mnt/0m (what file system)

so what is the file system i will write ,sorry again,but i need your help

thanks mark

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 03:32:30 GMT

No need to apologise. These forums are provided to offer help. I am glad you are using the forums.

Firstly, if your /etc/exports is OK go to your HP/solaris machine and do the "mount :/home /mnt"

This will get /home from the linux machine and mount it on /mnt on your HP/Solaris machine but on the /mnt filesystem. So, if you "cd /mnt" on the HP/Solaris, you will, in effect, be in /home on the linux machine. Do "ls -l" if you don't believe me :)

So, form the HP/SOlaris box, you would "tar cvf /mnt"

You will then have a nice backup of /home from the linux machine.

Re: remote backup

Fadia Almarei — Thu, 25 Mar 2004 03:44:01 GMT

if i want to backup another file system rather than /home what the difference in the mount point i have

Re: remote backup

Mark Grant — Thu, 25 Mar 2004 03:48:43 GMT

You can put them where you like. Just create a directory on the HP/Solaris e.g /backup and then add your new filesystem in /etc/exports like you did with /home and then mount :/newfilesystem /backup from the HP/Solaris system. Now you will have two filesystems mounted from your linux machine. /home mounted on /mnt and /newfilesystem mounted on /backup.

Re: remote backup

Roberto Polli — Mon, 19 Apr 2004 09:21:31 GMT

without using NFS you can do it with the tar distributed with linux (be sure to configure your /etc/pam.d/rsh|rexec to use rhosts authorization)

let
host1 the one with tape
host2 the one with files

host2:# tar cf[Bvp] host1:/path/to/tape /dir/to/bkup

It takes care to rsh to the remote host and then uses 'posix options' of tar

eg.: from linux host
tar cf host1:/dev/tape /home
backups tho /home dir on the /dev/tape placed on host1

This command works from linux hosts to almost every os, but won't work from system whom don't have gnu-tar.

Let Me Know if it works.
Peace,
Rob