asi,
I would rule out the lack of rules because on both xenial and bionic we
have LVM udev rules with the following line that is supposed to create a
LUKS UUID-based symlink:`
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*",
SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
https://git.launchpad.net/~usd-import-team/ubuntu/+source/lvm2/tree/udev/13-dm-disk.rules.in?h=ubuntu/xenial
https://git.launchpad.net/~usd-import-team/ubuntu/+source/lvm2/tree/udev/13-dm-disk.rules.in?h=ubuntu/bionic
The above test have shown that the symlink gets created on bionic.
For xenial it seems to be the same but this test is different in terms
of CPU load present on a machine (there is no load in my tests now in
comparison to the situations based on which we filed this bug):
uname -a
Linux maas-vhost6 4.4.0-135-generic #161-Ubuntu SMP Mon Aug 27 10:45:01 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
grep -RP ID_FS_UUID_ENC /lib/udev/rules.d/
/lib/udev/rules.d/60-persistent-storage-dm.rules:ENV{ID_FS_USAGE}=="filesystem|other|crypto",
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
/lib/udev/rules.d/60-persistent-storage.rules:ENV{ID_FS_USAGE}=="filesystem|other|crypto",
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
/lib/udev/rules.d/69-bcache.rules:ENV{ID_FS_UUID_ENC}=="?*",
SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
/lib/udev/rules.d/69-lvm-metad.rules:ENV{ID_FS_UUID_ENC}=="?*",
SYMLINK+="disk/by-id/lvm-pv-uuid-$env{ID_FS_UUID_ENC}"
/lib/udev/rules.d/63-md-raid-arrays.rules:ENV{ID_FS_USAGE}=="filesystem|other|crypto",
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 64G 0 disk
`-sda1 8:1 0 64G 0 part /
sdb 8:16 0 8G 0 disk
sdc 8:32 0 102.4M 0 disk
sdd 8:48 0 102.4M 0 disk
sde 8:64 0 102.4M 0 disk
vda 253:0 0 102.4M 0 disk
vdb 253:16 0 102.4M 0 disk
nvme0n1 259:0 0 20G 0 disk
nvme1n1 259:1 0 20G 0 disk
tree /dev/disk/by-uuid/
/dev/disk/by-uuid/
└── d26a75c9-15f7-41de-8c0e-20f795ed5729 -> ../../sda1
0 directories, 1 file
sudo cryptsetup luksFormat /dev/sdb
WARNING!
========
This will overwrite data on /dev/sdb irrevocably.
Are you sure? (Type uppercase yes): YES
Enter passphrase:
Verify passphrase:
ubuntu@maas-vhost6:~$ tree /dev/disk/by-uuid/
/dev/disk/by-uuid/
├── 42bf3808-9987-454f-be27-5d6c9b9c5c12 -> ../../sdb
└── d26a75c9-15f7-41de-8c0e-20f795ed5729 -> ../../sda1
0 directories, 2 files
sudo cryptsetup luksDump /dev/sdb | grep UUID
UUID: 42bf3808-9987-454f-be27-5d6c9b9c5c12
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https://bugs.launchpad.net/bugs/1780332
Title:
vaultlocker does not ensure that udev is triggered to create /dev/disk
/by-uuid/<uuid-in-luks-header> symlink and fails
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