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man/crypttab: do not recommend using /dev/sdX symlinks in /etc/crypttab

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This is just wrong. Quering the symlink names with udevadm is not the
easiest, but I think that's the safest way for a documented example.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2023-09-22 18:27:10 +02:00
parent 38e3c61dbb
commit 12c346d8e8
4 changed files with 34 additions and 18 deletions
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4
TODO
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@ -386,6 +386,10 @@ Features:
* udevd: extend memory pressure logic: also kill any idle worker processes
* udevadm: to make symlink querying with udevadm nicer:
- do not enable the pager for queries like 'udevadm info -q -r symlink'
- add mode with newlines instead of spaces (for grep)?
* SIGRTMIN+18 and memory pressure handling should still be added to: hostnamed,
localed, oomd, timedated.

16
man/fido2-crypttab.sh
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@ -8,13 +8,17 @@ sudo systemd-cryptenroll --fido2-device=auto /dev/sdXn
sudo /usr/lib/systemd/systemd-cryptsetup attach mytest /dev/sdXn - fido2-device=auto
# If that worked, let's now add the same line persistently to /etc/crypttab,
# for the future.
sudo bash -c 'echo "mytest /dev/sdXn - fido2-device=auto" >>/etc/crypttab'
# for the future. We don't want to use the (unstable) /dev/sdX name, so let's
# figure out a stable link:
udevadm info -q -r symlink /dev/sdXn
# Depending on your distribution and encryption setup, you may need
# to manually regenerate your initramfs to be able to use
# a FIDO2-Device to unlock the partition during early boot.
# More information at https://unix.stackexchange.com/a/705809
# Now add the line using the by-uuid symlink to /etc/crypttab:
sudo bash -c 'echo "mytest /dev/disk/by-uuid/... - fido2-device=auto" >>/etc/crypttab'
# Depending on your distribution and encryption setup, you may need to manually
# regenerate your initramfs to be able to use a FIDO2 device to unlock the
# partition during early boot.
# More information at https://unix.stackexchange.com/a/705809.
# On Fedora based systems:
sudo dracut --force
# On Debian based systems:

16
man/tpm2-crypttab.sh
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@ -8,13 +8,17 @@ sudo systemd-cryptenroll --tpm2-device=auto --tpm2-pcrs=7 /dev/sdXn
sudo /usr/lib/systemd/systemd-cryptsetup attach mytest /dev/sdXn - tpm2-device=auto
# If that worked, let's now add the same line persistently to /etc/crypttab,
# for the future.
sudo bash -c 'echo "mytest /dev/sdXn - tpm2-device=auto" >>/etc/crypttab'
# for the future. We don't want to use the (unstable) /dev/sdX name, so let's
# figure out a stable link:
udevadm info -q -r symlink /dev/sdXn
# 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.
# More information at https://unix.stackexchange.com/a/705809
# 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'
# 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.
# More information at https://unix.stackexchange.com/a/705809.
# On Fedora based systems:
sudo dracut --force
# On Debian based systems:

16
man/yubikey-crypttab.sh
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@ -24,13 +24,17 @@ sudo systemd-cryptenroll --pkcs11-token-uri=auto /dev/sdXn
sudo /usr/lib/systemd/systemd-cryptsetup attach mytest /dev/sdXn - pkcs11-uri=auto
# If that worked, let's now add the same line persistently to /etc/crypttab,
# for the future.
sudo bash -c 'echo "mytest /dev/sdXn - pkcs11-uri=auto" >>/etc/crypttab'
# for the future. We don't want to use the (unstable) /dev/sdX name, so let's
# figure out a stable link:
udevadm info -q -r symlink /dev/sdXn
# Depending on your distribution and encryption setup, you may need
# to manually regenerate your initramfs to be able to use a
# Yubikey / PKCS#11 Token to unlock the partition during early boot.
# More information at https://unix.stackexchange.com/a/705809
# Now add the line using the by-uuid symlink to /etc/crypttab:
sudo bash -c 'echo "mytest /dev/disk/by-uuid/... - pkcs11-uri=auto" >>/etc/crypttab'
# Depending on your distribution and encryption setup, you may need to manually
# regenerate your initramfs to be able to use a Yubikey / PKCS#11 token to
# unlock the partition during early boot.
# More information at https://unix.stackexchange.com/a/705809.
# On Fedora based systems:
sudo dracut --force
# On Debian based systems: