Restoreing Dump on FreeBSD headless server

[bsd]

Le 4 janv. 2010 à 19:56, Jerry McAllister a écrit :

> On Mon, Jan 04, 2010 at 07:08:51PM +0100, bsd wrote:
> 
>> Hello folks, 
>> 
>> 
>> I would like to know how to proceed in order to restore a dump from a 
>> backup headless server (remotely using ssh). 
> 
>> How am I supposed to proceed, should I first install the server (a FreeBSD 
>> Fresh install with spare partition) then restore the dump on an empty 
>> partition ?  
> 
> Depends on what you have and what you want to restore.
> Is the reason for the restore because the old disk went belly up?
> Or did you just nuke some stuff accidently.   Is the restore the
> boot disk or an extra work disk?   

Well, to tell you the truth: I am using a remote backup solution since 2.5 years and the provider has just told me that he would no longer support my hardware
so I need to rebuild a new server based on my previous config


> 
> In the first case, yes you will need to create something on the disk - 
> some sort of filesystem.   Probably that would mean using a fixit
> image to boot and do an fdisk(8), bsdlabel(8) and newfs(8).   

Ok, I think the server I will install that on might use some sort of virtual KVM that could allow me to do that


> 
> It the second case, the filesystem[s] is[are] still intact and you
> only need to do an 'interactive' restore of just the files you want.
> IF you are doing an intereactive restore and if you have room, it may 
> be easiest to copy the whole dump file over to some big space on the 
> system and run the restore from that copy.  Then you can just ssh in 
> and run it just as if it was setting beside you.
> 
> The same might not be true if you are replacing a destroyed disk 
> because the restore will be a complete one and no file selecting
> will be necessary.
> 
> If you cannot get physical contact with the machine, and the disk was
> damaged and replaced, you may have to learn how to do a network boot 
> and install.   I have never had to do that so am not a good one to guide 
> that process.   

Well my idea was to rebuild the new server based on the dump I have realised (in order to save me the time to do the reinstall). 
But from what you are telling me It might not be so easy


> 
> In either case of having to create slices, partitions and filesystems,
> you do not have to do a complete system install.  You need to do just
> enough building to have the filesystems created and mountable.

Yes but how should I partition that ? 

Should I re-create the 

/
/var
/usr
/tmp

or 

/ with minimal system


and re-create the mapping with nothing on slice. 


> The fixit
> is just fine for that.   If you can get that going remotely, then
> do the fdisk, bsdlabel and newfs-s from that and then restore from 
> the dump to the new filesystems.  

Ok, that should be the good path



> Forget about doing a real install.
> 
>> 
>> Should the new empty partition be the exact same size as the dumped 
>> partition ? 
> 
> It just has to be large enough to hold what you restore.
> In fact, it is a good time to increase or adjust filesystem sizes if
> you have more room on the replacement disk.

Good


> 
>> 
>> Is there a tool that could allow me to restore remotely ? 
>> 
> 
> You can use rsh(1).   I have done that.    
> Probably some specific ssh method too, but I am so old I haven't
> done one with that new fangled secure ssh yet...

Ok. 


Thanks. 

> 
> ////jerry    
> 
> 
>> 
>> Any advice or howto will be (very) welcome. 
>> 
>> 
>> Thanks. 
>> 
>> 
>> P.S. Happy new BSD year !! 
>> 
>> 
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>> bsd @at@ todoo.biz
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>> 
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Gregober ---> PGP ID --> 0x1BA3C2FD
bsd @at@ todoo.biz
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