Booting via GRUB 2 prompt: Difference between revisions
(Created page with "Did your update-initramfs not complete before you rebooted your zfs-on-root Ubuntu install? Here's how to boot it from the GRUB prompt using a previous kernel, assuming that y...") |
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grub> initrd /BOOT/ubuntu/HEAD/@/initrd.img-5.4.0-42-generic | grub> initrd /BOOT/ubuntu/HEAD/@/initrd.img-5.4.0-42-generic | ||
grub> boot | grub> boot | ||
</pre> | |||
That should load the kernel and initial ramdisk. If you are then dropped to an '''<tt>(initramfs)</tt>''' shell, you'll have to manually import the zpool containing the root filesystem: | |||
<pre> | |||
(initramfs) /sbin/modprobe zfs | (initramfs) /sbin/modprobe zfs | ||
(initramfs) zpool import rpool -R /root | (initramfs) zpool import rpool -R /root | ||
(initramfs) exit | (initramfs) exit | ||
</pre> | </pre> | ||
Note: The following: | |||
net.ifnames=0 biosdevname=0 | net.ifnames=0 biosdevname=0 | ||
to ensure that all Ethernet device names use the naming scheme '''<tt>ethX</tt>''' for consistency. That part is not necessary. | was added to the kernel parameters to ensure that all Ethernet device names use the naming scheme '''<tt>ethX</tt>''' for consistency. That part is not necessary. | ||
Revision as of 03:28, 6 February 2021
Did your update-initramfs not complete before you rebooted your zfs-on-root Ubuntu install? Here's how to boot it from the GRUB prompt using a previous kernel, assuming that your boot filesystem is on (hd0,gpt3), the zfs dataset name of your boot filesystem is bpool/BOOT/ubuntu/HEAD, the zfs dataset name of your root filesystem is rpool/ROOT/ubuntu/HEAD, and you're wanting to boot version 5.4.0-42-generic of the kernel:
grub> insmod zfs grub> set root=(hd0,gpt3) grub> linux /BOOT/ubuntu/HEAD/@/vmlinuz-5.4.0-42-generic boot=zfs zfs_force=1 root=ZFS=rpool/ROOT/ubuntu/HEAD net.ifnames=0 biosdevname=0 grub> initrd /BOOT/ubuntu/HEAD/@/initrd.img-5.4.0-42-generic grub> boot
That should load the kernel and initial ramdisk. If you are then dropped to an (initramfs) shell, you'll have to manually import the zpool containing the root filesystem:
(initramfs) /sbin/modprobe zfs (initramfs) zpool import rpool -R /root (initramfs) exit
Note: The following:
net.ifnames=0 biosdevname=0
was added to the kernel parameters to ensure that all Ethernet device names use the naming scheme ethX for consistency. That part is not necessary.