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r8 - 01 Nov 2006 - 20:54:18 - AdminAdminYou are here: TWiki >  Main Web  >  Dedibox-FreeBSD-English > Dedibox-FreeBSD-English-Rescue

Installing a pseudo rescue for FreeBSD on a DediBox.

To create a rescue, we'll create a small partition and install a minimal installation of FreeBSD. We could use sysinstall but there is a bug with it when using multiple installations, so to create the partitions and slices we'll use the command line.

Here are the steps and the screenshots for this double installation after booting the box on FreeBSD from the memory as described in Dedibox FreeBSD.

  • Create two partitions with fdisk :
# fdisk /dev/ad4
This disk has both DOS and BSD magic. Give the 'b' command to go to BSD mode.

The number of cylinders for this disk is set to 19457.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
  (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/ad4: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot    Start       End    Blocks   Id  System
/dev/ad4s4   *         1         4     25000   a5  FreeBSD

Command (m for help): d
Selected partition 4

Command (m for help): n
Command action
  e   extended
  p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-19457, default 1): ENTER
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-19457, default 19457): 250

Command (m for help): t
Selected partition 1 Hex code (type L to list codes): a5
Changed system type of partition 1 to a5 (FreeBSD)

Command (m for help): n
Command action
  e   extended
  p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (251-19457, default 251): ENTER
Using default value 251
Last cylinder or +size or +sizeM or +sizeK (251-19457, default 19457): 19457

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): a5
Changed system type of partition 2 to a5 (FreeBSD)

Command (m for help): a
Partition number (1-4): 1

Command (m for help): p

Disk /dev/ad4: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot    Start       End    Blocks   Id  System
/dev/ad4s1   *         1       250   2008093+  a5  FreeBSD
/dev/ad4s2           251     19457 154280227+  a5  FreeBSD

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

  • Initialize the partitions and install the boot record:
# bsdlabel -wB ad4s1
# bsdlabel -wB ad4s2

  • Using bsdlabel -e ad4s2 Create the slices upon your needs, here is an example:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
a: 6g         16        4.2BSD        0     0
b: 4g         *         swap
c: 308560455  0         unused       0     0         # "raw" part, don't edit
d: 20g        *         4.2BSD
e: 6g         *         4.2BSD
f: *          *         4.2BSD

  • Format the slices and mount them :
# newfs /dev/ad4s1a
# newfs /dev/ad4s2a
# newfs -U /dev/ad4s2d
# newfs -U /dev/ad4s2e
# newfs -U /dev/ad4s2f
# mkdir /rescue
# mkdir /dest
# mount /dev/ad4s1a /rescue
# mount /dev/ad4s2a /dest
# mkdir /dest/usr
# mkdir /dest/tmp
# mkdir /dest/var
# mount /dev/ad4s2d /dest/var
# mount /dev/ad4s2e /dest/tmp
# mount /dev/ad4s2f /dest/usr

  • Launch sysinstall and change Install Root to "/rescue" from the "Options" menu. Install normally in standard, express or custom mode, and choose the minimal installation. Then modify again the Install Root to "/dest" and install again upon your needs. Here are the screen shots of the custom mode :
new1.png new2.png new3.png new4.png new5.png new6.png new7.png new8.png

  • Finish the installation like in the Standard Installation, and take care, you need to copy the configuration files to both installation : /dest/etc and /rescue/etc.

  • Don't forget to create the fstab files for both installations, you will have the rescue one like :
    /dev/ad4s1a             /               ufs     rw              1       1
    And the /dest/etc/fstab :
    /dev/ad4s2a             /               ufs     rw              1       1
    /dev/ad4s2b             none            swap    sw              0       0
    /dev/ad4s2d             /var            ufs     rw              2       2
    /dev/ad4s2e             /tmp            ufs     rw              2       2
    /dev/ad4s2f             /usr            ufs     rw              2       2

  • To boot on the rescue partition, choose mode secours from the web interface, connect via SSH and change the active partition using fdisk /dev/sda and type a to choose the rescue one, then put back the server to the mode normal from the web interface.

Good luck



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Main.Dedibox-FreeBSD-English-Rescue moved from Main.DediboxFreeBSDEnglishRescue on 01 Nov 2006 - 19:43 by AdminAdmin - put it back
 
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