RE: [gentoo-server] Quick restores

Excellent!  Just the thing I need to shore up my backups at home.
However, here at work I think it'd need a little sprucing up for the
software RAID sets.

Thanks!
Rich

-----Original Message-----
From: Michael Irey [mailto:michael@××××.org] 
Sent: Wednesday, November 30, 2005 7:59 PM
To: gentoo-server@l.g.o
Subject: Re: [gentoo-server] Quick restores


On Wednesday 30 November 2005 1:59 pm, A. Khattri wrote:
>
> Im wondering if anyone has written a script (or maybe there's a tool
to do
> this) that will make binary packages of everything installed on a
server
> which can then be used to perform very quick restores in the event of
a
> major failure?
>

I use the following to do a quick and complete restore for a remote
gentoo 
server at 1and1.

	
----------------------------------------
| Linux Backup and Bare Metal Recovery |
----------------------------------------

-- Backup

1) save metadata about how the disk is partitioned.
  
   # sfdisk -l > /etc/partition.bak
   # cp /etc/fstab /etc/fstab.bak


2) back up master boot record (MBR)
   
   # dd if=/dev/hda of=/etc/mbr.bak bs=512 count=1


3) back up the operating system:
   
   # mount /boot  ## if its not already
   # cd /
   # tar -jcf --anchored --exclude '/sys' --anchored --exclude '/proc' 
--anchored --exclude '/lost+found' - / | ssh target "cat > 
filename.tar.bz2"

   TODO: ssh -> ftp for 1and1


-- Restore

1) boot rescue mode ( debian 2.6 at 1and1 )


2) partition drive(s)

   # ssh backupserver 'cat /etc/partition.bak' 
     Disk /dev/sda: 9729 cylinders, 255 heads, 63 sectors/track
     Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting 
from 0
                                     
        Device Boot Start     End   #cyls    #blocks   Id  System
     /dev/sda1   *      0+      8       9-     72261   83  Linux
     /dev/sda2          9     133     125    1004062+  82  Linux swap / 
Solaris
     /dev/sda3        134    9728    9595   77071837+  83  Linux
     /dev/sda4          0       -       0          0    0  Empty


   # sfdisk /dev/sda << EOF
   0,9,83,*
   9,125,82
   134,9595,83
   ,,0;
   EOF
     notes:
       sfdisk reads lines of the form <start> <size> <id> <bootable> 
<c,h,s> <c,h,s> 
       where each line fills one partition descriptor.


3) create file systems
   
   # mke2fs /dev/sda1
   # mke2fs -j /dev/sda3
   # mkswap /dev/sda2

   # mkdir /mnt/gentoo
   # mkdir /mnt/gentoo/boot
   
   # swapon /dev/sda2
   # mount -t ext3 /dev/sda3 /mnt/gentoo
   # mount /dev/sda1 /mnt/gentoo/boot

4) restore OS and data

   # cd /mnt/gentoo 
   # ssh target "cat filename.tar.bz2" | tar jpvxf -
     notes:
       -j   Decompress with bzip2
       -p   Preserve permissions
       -v   Verbose
       -x   Extract
       -f   File

     TODO: ssh -> ftp for 1and1

5) restore MBR
   
   # dd if=/mnt/gentoo/etc/mbr.bak of=/dev/sda bs=512 count=1
     notes:
       one could run grub-install --no-floppy /dev/sda instead.


--end


-- 
Michael Irey
System Administrator

......................................................................
SightWorks, Inc.
5331 SW Macadam Avenue, Suite 348
Portland, Oregon  97239

Web: http://www.sightworks.com
 
SightWorks : Creative Internet Technologies
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