"gptzfsboot: No ZFS pools located, can't boot." - What am I doing wrong?


New Member

Messages: 10

I'm trying to do geli-encrypted FreeBSD dual-boot with Debian on legacy BIOS. My partition scheme is:
  • /dev/ada0 (gpt)
    • /dev/ada0p1 (bios boot)
    • /dev/ada0p2 (linux filesystem)
    • /dev/ada0p3 (linux filesystem)
    • /dev/ada0p4 (freebsd boot)
    • /dev/ada0p5 (freebsd swap)
    • /dev/ada0p6 (freebsd zfs)
I've followed these instructions (link: https://wiki.freebsd.org/MasonLoringBliss/LegacyZFSandGELI) but unfortunately, I've got the following error during booting system: "gptzfsboot: No ZFS pools located, can't boot."

The output from gpart backup ada0 is:
GPT 8184
1 bios-boot      2048            2048
2 linux-data     4096            497664
3 linux-data     501760          2776629248
4 freebsd-boot   2777131008      256              boot0
5 freebsd-swap   2777133056      16777216         swap0
6 freebsd-zfs    2793910272      3066619904       tank0
[FONT=Arial]And from zpool import:[/FONT]
ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present; to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
    pool: tank
      id: 13125465944866070244
   state: ONLINE
  action: The pool can be imported using its name or numeric identifier.

           tank         ONLINE
           ada0p6.eli   ONLINE
[FONT=Arial]The output from geli list:[/FONT]
Geom name: ada0p6.eli
EncryptionAlgorithm: AES-XTS
KeyLength: 256
Crypto: software
Version: 7
UsedKey: 0
KeysAllocated: 366
KeysTotal: 366
1. Name: ada0p6.eli
   Mediasize: 1570109386752 (1.4T)
   Sectorsize: 4096
   Mode: r0w0e0
1. Name: ada0p6
   Mediasize: 1570109390848
   Sectorsize: 512
   Stripesize: 4096
   Stripeoffset: 0
   Mode: r1w1e1
What am I doing wrong?


Active Member

Reaction score: 48
Messages: 185

Hi, I had a similar problem and I have just found a solution. To be able to boot from an encrypted ZFS pool there are several prerequisites.

1. You must have a freebsd-boot partition of size <0.5M, where the boot code is installed. From this link: https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot
When formatting your boot drive, assuming it's called da0 and the freebsd-boot partition is with number 1:
gpart add -a 4k -s 512K -t freebsd-boot da0
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
2. When encrypting your BOOT partition (in my case it's boot AND root together), you need to set a GELI flag that the partition contains an encrypted bootable pool. After geli init and attach:
geli configure -g da0p2
My encrypted boot/root pool is on da0p2.

This is from the geli() man page:
-g        Enable booting from this encrypted root
                filesystem.  The boot loader prompts for the
                passphrase and loads loader(8) from the
                encrypted partition.
3. Your ZFS pool must have the "bootfs" property set to the name of the ZFS dataset you want to boot from. In my case it's "zroot/ROOT/default", it should map to a ZFS dataset containing /boot directory with loader etc.

I wish you good luck.