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man/crypttab: add a more comprehensive example of encrypted device setup

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Zbigniew Jędrzejewski-Szmek 2023-09-22 18:37:49 +02:00
parent 12c346d8e8
commit 4381474f7f
1 changed files with 16 additions and 0 deletions
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16
man/tpm2-crypttab.sh
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@ -15,6 +15,22 @@ udevadm info -q -r symlink /dev/sdXn
# Now add the line using the by-uuid symlink to /etc/crypttab:
sudo bash -c 'echo "mytest /dev/disk/by-uuid/... - tpm2-device=auto" >>/etc/crypttab'
# And now let's check that automatic unlocking works:
sudo /usr/lib/systemd/systemd-cryptsetup detach mytest
sudo systemctl daemon-reload
sudo systemctl start cryptsetup.target
systemctl is-active systemd-cryptsetup@mytest.service
# Once we have the device which will be unlocked automatically, we can use it.
# Usually we would create a file system and add it to /etc/fstab:
sudo mkfs.ext4 /dev/mapper/mytest
# This prints a 'Filesystem UUID', which we can use as a stable name:
sudo bash -c 'echo "/dev/disk/by-uuid/... /var/mytest ext4 defaults,x-systemd.mkdir 0 2" >>/etc/fstab'
# And now let's check that the mounting works:
sudo systemctl daemon-reload
sudo systemctl start /var/mytest
systemctl status /var/mytest
# Depending on your distribution and encryption setup, you may need to manually
# regenerate your initramfs to be able to use a TPM2 security chip to unlock
# the partition during early boot.