copying just / (not /tmp, /usr, etc) (rsync -x failed)

[Eric Crist]

On Dec 6, 2007, at 8:48 AM, Konstantinos Pachnis wrote:

> James Harrison wrote:
>> On Wed, 2007-12-05 at 10:41 -0500, Jerry McAllister wrote:
>>
>>> On Tue, Dec 04, 2007 at 05:38:20PM -0700, Steve Franks wrote:
>>>
>>>
>>>> I have / on one slice, and [usr,tmp,var] on others.  I want to move
>>>> just / to a new disk, which seemed to be what rsync -x ("do not  
>>>> cross
>>>> filesystems") was intended for.  It failed, however, as df shows  
>>>> 20k
>>>> blocks in /, and rsync filled up the target slice with 50k  
>>>> blocks, so
>>>> obviously it blew right past the 'end' of / - did I miss  
>>>> something? Is
>>>> there no other way except to umount [tmp,usr,var]?
>>>>
>>> I would use dump/restore.
>>>
>>> Build the filesystem in the new disk partition with fdisk, bsdlabel
>>> and newfs as needed. Then mount the new partition somewhere -
>>> example:
>>>  mkdir /newpart
>>>  mount /dev/ad1s1a /newpart
>>>        (presuming new disk is ad1, slice is 1, partition is a)
>>>  Doesn't hurt to do an fsck on it here before writing to it, but it
>>>  probably isn't really needed.
>>>
>>> Then, run the dump/restore
>>>
>>>  cd /newpart
>>>  dump 0af - / | restore -rf -
>>>
>>> This will get all of / as you want.  The other mountpoints for / 
>>> tmp, /usr
>>> and /var will be copied, but not the contents of those  
>>> filesystems.  You
>>> probably want that.
>>>
>>> ////jerry
>>>
>>>
>>>> Thanks,
>>>> Steve
>>>>
>>
>> Everyone's recommending dump/restore for copying file systems, and
>> there's something that I've never really been clear on.
>>
>> The nice thing about rsync is that it's network aware. Can dump  
>> dump a
>> file system across a network?
>>
>> James
>>
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>>
>>
> Hi,
> If you want to perform network backups, you should consider using a
> network aware backup solution such as Bacula or Amanda.
>
> Konstantinos


We do this little trick when we're moving an OS to a new system, and  
don't want to reinstall:
https://www.secure-computing.net/wiki/index.php/Dump_Over_SSH

HTH

-----
Eric F Crist
Secure Computing Networks