Reference Information › CA AppLogic Support Knowledge Base › Overview of Support Knowledge Base › Mounting a .Boot Volume from Another Appliance - Grub Reinstall

Mounting a .Boot Volume from Another Appliance - Grub Reinstall

These steps are helpful if the .boot was overwritten or corrupted on an appliance. In this case the customer was unable to boot their application after the appliance volume was re-sized. This is a bug in 3.1 and unsure about 3.5 at this time. You can mount a DVD .iso to boot as well but the steps below can be executed quicker under most conditions.

[root@Dev1 ~]# 3t app create catest
Creating descriptors for application 'catest'...
Warning: Application 'catest' does not have an owner.
APPLOGIC RESTRICTED AREA
[root@Dev1 ~]# 3t app modify_acl catest <userID>=full

From the appliance Canvas:

1. Branch the appliance.
2. Modify the boundary -> add a placeholder volume.
3. Edit the appliance user volumes by linking the app user volume to the placeholder volume

   [root@Dev1 ~]# 3tctl rename sv build_box.class.centos5_64.boot catest.user.centos5_64boot
   [root@Dev1 ~]# 3t app start catest --debug
   Building application...
   Configuring application...Done
   Loading application...
   Scheduling application...
   Starting application catest
   main.LINUX64 started
   Application catest started successfully
   APPLOGIC RESTRICTED AREA
   [catest:main.LINUX64 ~]# mount /dev/hdb1 /mnt/temp
   [catest:main.LINUX64 ~]# mount -t proc none /mnt/temp/proc
   [catest:main.LINUX64 ~]# mount -o bind /dev /mnt/temp/dev
   [catest:main.LINUX64 ~]# chroot /mnt/temp /bin/bash
   [root@LINUX64 /]# grub
   Probing devices to guess BIOS drives. This may take a long time.
   GNU GRUB version 0.97 (640K lower / 3072K upper memory)
   [ Minimal BASH-like line editing is supported. For the first word, TAB
   lists possible command completions. Anywhere else TAB lists the possible
   completions of a device/filename.]
   grub> root (hd1,0)
   root (hd1,0)
   Filesystem type is ext2fs, partition type 0x83
   grub> setup (hd1)
   setup (hd1)
   Checking if "/boot/grub/stage1" exists... yes
   Checking if "/boot/grub/stage2" exists... yes
   Checking if "/boot/grub/e2fs_stage1_5" exists... yes
   Running "embed /boot/grub/e2fs_stage1_5 (hd1)"... 15 sectors are embedded.
   succeeded
   Running "install /boot/grub/stage1 (hd1) (hd1)1+15 p
   (hd1,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded
   Done.
   grub> quit
   quit
   [root@LINUX64 /]# exit
   exit
   [catest:main.LINUX64 ~]# umount /mnt/temp/dev
   [catest:main.LINUX64 ~]# umount /mnt/temp/proc
   [catest:main.LINUX64 ~]# umount /mnt/temp
   [catest:main.LINUX64 ~]#
   [root@Dev1 ~]# 3tctl rename sv catest.user.centos5_64boot
   build_box.class.centos5_64.boot
   APPLOGIC RESTRICTED AREA
   [root@Dev1 ~]# 3t app start build_box --debug
   Building application...
   Configuring application...Done
   Loading application...
   Scheduling application...
   Starting application build_box
   main.INSSLR started
   main.NET started
   main.centos5_64 started
   Application build_box started successfully
   APPLOGIC RESTRICTED AREA
   [root@Dev1 ~]#