I must add I can boot the container this way :
gabx@hortensia ➤➤ ~ # systemd-nspawn -bD /machine/dahlia
A few error messages at boot :
Set hostname to <dahlia>.
Failed to verify GPT partition /dev/sdb1: No such file or directory
/usr/lib/systemd/system-
generators/systemd-gpt-auto-generator exited
with exit status 1.
# blkid
/dev/sdb1: UUID="f69d032f-c80f-4f2e-84cd-d2328a862818" TYPE="ext4"
PARTUUID="d0b295ec-c189-497f-86f1-0e631390ff19"
gabx@hortensia ➤➤ ~ # parted /dev/sdb
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 115GB 115GB ext4
So where does the issue come ?