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rafauke

Member

Registered: 2022-02-07

Posts: 3

How to resize /boot partition with LUKS-encrypted btrfs partition?

Hello all,

I'm sorry if this exact issue has been raised before, but I'm having trouble correctly resizing the /boot partition, having the LUKS-encrypted partition right next to it.

So in short, the thing I'm trying to do is resizing from  512M of /boot to something like 1G, because recently I've started having some problems updating the system. I usually have to remove the .img files before regenerating them with mkinitcpio because they are so fat. I have two kernels in my config: mainline and lts. I like to experiment with kernels from time to time, so I think it would be great to have an option for resize.

/boot looks like this:

/boot
├── EFI
│   ├── BOOT
│   │   └── BOOTX64.EFI
│   ├── Linux
│   └── systemd
│       └── systemd-bootx64.efi
├── initramfs-linux-fallback.img
├── initramfs-linux.img
├── initramfs-linux-lts-fallback.img
├── initramfs-linux-lts.img
├── intel-ucode.img
├── loader
│   ├── entries
│   │   ├── lts.conf
│   │   └── stock_default.conf
│   ├── loader.conf
│   └── random-seed
├── syslinux
│   └── syslinux.cfg
├── vmlinuz-linux
└── vmlinuz-linux-lts

/etc/mkinitpcio.conf looks like this:

MODULES=(btrfs nvidia nvidia_modeset nvidia_uvm nvidia_drm)
BINARIES=(/usr/bin/btrfs)
FILES=()
HOOKS=(base udev plymouth encrypt autodetect modconf block filesystems keymap keyboard fsck)

lsblk:

NAME        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
sda           8:0    0 465.8G  0 disk  
└─sda1        8:1    0 465.8G  0 part  /mnt/mx500
nvme0n1     259:0    0 931.5G  0 disk  
├─nvme0n1p1 259:1    0   512M  0 part  /boot
└─nvme0n1p2 259:2    0   931G  0 part  
  └─luksdev 254:0    0   931G  0 crypt /var/lib/docker/btrfs
                                       /
nvme1n1     259:3    0 931.5G  0 disk  
└─nvme1n1p1 259:4    0 931.5G  0 part  /mnt/980

I tried shrinking the main partition in live environment using gparted, but I couldn't move it "to the right" in order to expand the /boot partition.

Is there any way to safely expand the /boot partition in this scenario? I would be grateful for your suggestions and guidance. Please let me know if I can provide more details.

Last edited by rafauke (2023-06-21 17:36:02)