LTM v11.3 + GRUB2 - How to boot into single mode for recovery ?

But with 11.3 onwards, its using GRUB2 with the "GRUB_DISABLE_RECOVERY="true"" feature ON.

i am running 11.5.1 but i do not think GRUB_DISABLE_RECOVERY is turned on.

[root@ve11a:Active:In Sync] config  cat /var/run/grub.conf.mdfy.10237
default=1
splashimage=(hd0,0)/img/splashimage.xpm.gz
timeout=8

title BIG-IP 11.5.0 Build 0.0.221 - drive sda.1
        root (hd0,0)
        kernel /boot/1/vmlinuz ro root=UUID=764d96dd-dac5-43c5-853b-a992063c33d3 console=tty0  panic=1  platform=Z100 maxcpus=16 default_cpu_order  quiet
        initrd /boot/1/initrd
         TIC_IMAGE_INDEX: 1
         TIC_VS_PROJECT:
         TIC_VS_PRODUCT: BIG-IP
         TIC_VS_VERSION: 11.5.0
         TIC_VS_BUILD: 0.0.221
         TIC_VS_BASEBUILD: 0.0.221
         TIC_VS_EDITION: Final

title BIG-IP 11.5.1 Build 0.0.110 - drive sda.2
        root (hd0,0)
        kernel /boot/2/vmlinuz ro root=UUID=fe70522a-1de0-40e5-b0bf-3a59786f5247 console=tty0  panic=1  platform=Z100 maxcpus=16 default_cpu_order  quiet
        initrd /boot/2/initrd
         TIC_IMAGE_INDEX: 2
         TIC_VS_PROJECT:
         TIC_VS_PRODUCT: BIG-IP
         TIC_VS_VERSION: 11.5.1
         TIC_VS_BUILD: 0.0.110
         TIC_VS_BASEBUILD: 0.0.110
         TIC_VS_EDITION: Final

title TMOS maintenance
        root (hd0,0)
        kernel /vmlinuz.mos root=/dev/ram0 rw console=tty0 ramdisk_size=224586.5 skip_media
        initrd /initrd.img.mos
         TIC_STATIC_KEY: st.mos
         TIC_STATIC_VERSION: 2.8.5.1-2.0

ps. grub_open and grub_close are updated for grub2 in 11.5.0.

Not quite sure what you mean, but after editing the grub config file. How do I run "update-grub" ?

Or instead, how to I go into single mode during boot as the grub didnt stop and allow me to edit on the spot.

after editing the grub config file. How do I run "update-grub" ?

where is grub2.cfg you edited? didn't you mount boot, edit and un-mount?

[root@B5200-R78-S13:Active:Standalone] config  ls -l /dev/mapper/vg--db--sda-dat.boot
brw-rw---- 1 root disk 253, 0 Apr 28 10:54 /dev/mapper/vg--db--sda-dat.boot

the mount boot i did was using a live Ubuntu.

Em . I rather new and was only trying snippets to try to do what I asked. So if one could just point me to a step by step dummy like blogpost or tutorial. It would be great.

nitass. Thanks for your replies but I just aint advance enough to get it.

i do not have 11.3 now but 11.4.1. procedure in sol14662 seems correct here. doesn't it really work on yours?

sol14662: Restarting the BIG-IP system in single-user mode (GRUB2)

                         GNU GRUB  version 2.00~beta4

 ****************************************************************************
 * setparams 'BIG-IP 11.4.1 Build 637.0 '                           *
 *                                                                          *
 *         set root='(lvm/vg--db--sda-dat.boot)'                            *
 *         linux /boot/92/vmlinuz ro root=UUID=8f6a76b7-9fd6-4403-b591-6b1\ *
 * 2d3339b1e  console=ttyS0 panic=1  platform=C109  quiet                   *
 *         initrd /boot/92/initrd                                           *
 *          TIC_IMAGE_INDEX: 92                                            *
 *          TIC_VS_PRODUCT: BIG-IP                                         *
 *          TIC_VS_VERSION: 11.4.1                                         *
 *          TIC_VS_BUILD: 637.0                                            *
 *          TIC_VS_BASEBUILD: 608.0                                        *
 *                                                                          *
 *                                                                          *
 ****************************************************************************

      Minimum Emacs-like screen editing is supported. TAB lists
      completions. Press Ctrl-x or F10 to boot, Ctrl-c or F2 for
      a command-line or ESC to discard edits and return to the GRUB menu.

to modify grub configuration, normally grub_open and grub_close scripts are used. anyway, since there is an issue in script files in 11.3.0, you may manually mount boot volume and edit grub configuration file.

e.g.

[root@B5200-R78-S13:Active:Standalone] config  mkdir /mnt/boot

[root@B5200-R78-S13:Active:Standalone] config  mount /dev/mapper/vg--db--sda-dat.boot /mnt/boot

[root@B5200-R78-S13:Active:Standalone] config  ls -l /mnt/boot/grub2/grub.cfg
-rw-r--r-- 1 root root 2021 Apr 28 20:31 /mnt/boot/grub2/grub.cfg

[root@B5200-R78-S13:Active:Standalone] config  umount /mnt/boot

I didnt get to see the grub menu at all. Which is what lead me to assume the "GRUB_DISABLE_RECOVERY" being on.

I will try to test the eg. portion and report back.

Thanks again for your patience.