Re: [PLUG] Fixing /boot/ too small

["Keith C. Perry via plug" <plug@lists.phillylinux.org>]

I did a bunch of work like this a couple of years ago but not remotely so I would be nervous about it too but as I recall...

1) For boot... just copy its contents to new to the /boot partition (on main partition).  I usually umount /boot and mount it to a tmp location so I can copy directly to the new /boot path.  Then upgrade grub to reflect the new UUID that will be booting (for Ubuntu / Debian distro's there is an "update-grub" command).

2) RAID-1... here is where I'm weird... I don't use mdadm, only straight LVM (which uses mdadm behind the scenes for LVM above a certain version which I forget now... 2.02.140 maybe).  The trick here is to do the "grub-install" to both mirror images- so sda and sdb in your case.  I don't think it matters that you're using mdadm directly instead of LVM but I want to be very honest in saying that I've only even done this with straight LVM.

(Ok, so I wrote that before I saw your steps...  looks good, I've never done the update-initramfs step but that can't hurt.  Only thing missing was my #2 but I don't think its strictly required in your case)

I'm sure you've been meticulous in your testing on the VM but I would be prepared to take that drive and have live cd / usb in your kit.  Grub can be finicky but the mirroring piece of this honestly makes me the most nervous even though that obviously is already working.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
Keith C. Perry, MS E.E. 
Managing Member, DAO Technologies LLC 
(O) +1.215.525.4165 x2033 
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www.daotechnologies.com

----- Original Message -----
From: "JP Vossen via plug" <plug@lists.phillylinux.org>
To: plug@lists.phillylinux.org
Sent: Wednesday, April 8, 2020 9:49:39 PM
Subject: Re: [PLUG] Fixing /boot/ too small

On 4/8/20 12:08 AM, brent timothy saner via plug wrote:
> On 4/7/20 23:24, JP Vossen via plug wrote:
>> Summary: I need to fix some Mint-19 workstations where /boot/ is too small.
> 
> is it using UEFI or BIOS booting?

They are old, it's BIOS and MBR, but UUIDs are in use in /etc/fstab. 
And everything Just Works now, the only thing I need to do is move 
'/boot/' from its own md device into '/' so there is space.


`/etc/fstab` excerpt (updated to but not rebooted):
```
# / was on /dev/md2 during installation
UUID=bafdc515-511e-44b9-85d0-e1cd164cc58c /               ext4 
errors=remount-ro 0       1

# /boot was on /dev/md1 during installation
#UUID=21fd376b-fa9a-4dd0-bfa3-f3ca314d0648 /boot           ext4 
defaults        0       2
# 2020-04-07 /boot/ HACK
UUID=21fd376b-fa9a-4dd0-bfa3-f3ca314d0648 /boot.old        ext4 
defaults        0       2
```

And (edited for clarity):
```
$ df -hl
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/md2       ext4      913G  285G  582G  33% /
/dev/md1       ext4      190M   86M   90M  49% /boot.old

$ lsblk -f
sda
├─sda1  linux_raid_member mint:0 9ce43e0d-5683-e2fb-e0e5-abaaf06ca0f8
│ └─md0 swap                     314df59b-cdd2-46a4-b07b-9d0bfb77b0f7
├─sda2  linux_raid_member mint:1 79eb3cbb-2e42-5a08-4be3-39ff2a609919
│ └─md1 ext4                     21fd376b-fa9a-4dd0-bfa3-f3ca314d0648 
/boot.old
└─sda3  linux_raid_member mint:2 e696d253-57f3-ca09-c8ec-d5b452209e51
   └─md2 ext4                     bafdc515-511e-44b9-85d0-e1cd164cc58c /
sdb
├─sdb1  linux_raid_member mint:0 9ce43e0d-5683-e2fb-e0e5-abaaf06ca0f8
│ └─md0 swap                     314df59b-cdd2-46a4-b07b-9d0bfb77b0f7
├─sdb2  linux_raid_member mint:1 79eb3cbb-2e42-5a08-4be3-39ff2a609919
│ └─md1 ext4                     21fd376b-fa9a-4dd0-bfa3-f3ca314d0648 
/boot.old
└─sdb3  linux_raid_member mint:2 e696d253-57f3-ca09-c8ec-d5b452209e51
   └─md2 ext4                     bafdc515-511e-44b9-85d0-e1cd164cc58c
...
```

Thanks,
JP
--  -------------------------------------------------------------------
JP Vossen, CISSP | http://www.jpsdomain.org/ | http://bashcookbook.com/
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