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Nützliches Skript soll in main. Wird verwendet, um images ohne swap mit swap auf btrfs-subvols auszustatten Also ein post-post instlal skript Co-authored-by: Robert <robertofon@os23.de> Reviewed-on: https://codeberg.org/Computertruhe/Setup-Skripte/pulls/81 Reviewed-by: Agent_K <agent_k@noreply.codeberg.org>
72 lines
No EOL
2.4 KiB
Bash
72 lines
No EOL
2.4 KiB
Bash
#!/bin/bash
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# skript baut ein subvol /@swap unten drunter und mountet das
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# ganze als /swap um darin /swap/swapfile als swapspace
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# zu aktivieren - größe 8G oder was man sich ausdenkt
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# It is possible to use a swap file on btrfs, but there are some considerations that need taking care of.
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# btrfs filesystem doesn't let to create snapshots if there is a working swap file on the subvolume. That means that it is highly recommended to place a swap file on a separate subvolume.
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# Let's assume that the current swap is already off, the / is on /dev/sda1 and Ubuntu is installed with / on @ subvolume and /home is on @home subvolume.
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# Mount /dev/sda1 to /mnt.
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rootdevsrc=$(findmnt -nr -T / -osource)
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echo "Mount / ist gebunden auf $rootdevsrc"
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if [[ "$rootdevsrc" =~ \[/@]$ ]]
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then
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echo "Verwendung von btrfs subvol /@"
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else
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echo "Hier stimmt was nicht. $rootdevsrc enthält kein btrfs-subvol oder subvol ist nicht '/@'"
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exit 1
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fi
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rootdev=${rootdevsrc%\[/@]}
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echo "BTRFS-Device ist daher $rootdev"
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echo "OK - erzeuge jetzt (etwas umständlich) ein SubVol /@swap, in dem swapfile liegt"
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# zunächst nochmal mounten, damit die root-subvols sichtbar werden
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sudo mount $rootdev /mnt
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# If you run ls /mnt, you'll see @, @home and other subvolumes that may be there.
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# Create a new @swap subvolume.
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sudo btrfs sub create /mnt/@swap
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# Unmount /dev/sda1 from /mnt.
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sudo umount /mnt
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# Create /swap directory where we plan to mount the @swap subvolume.
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sudo mkdir /swap
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# Mount the @swap subvolume to /swap.
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sudo mount -o subvol=@swap $rootdev /swap
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# Create the swap file.
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sudo touch /swap/swapfile
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# Set 600 permissions to the file.
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sudo chmod 600 /swap/swapfile
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# Disable COW for this file.
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sudo chattr +C /swap/swapfile
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# Set size of the swap file to 8G as an example.
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sudo dd if=/dev/zero of=/swap/swapfile bs=1M count=8192
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# Format the swapfile.
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sudo mkswap /swap/swapfile
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# Turn the swap file on.
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sudo swapon /swap/swapfile
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# Now the new swap should be working.
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#
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# You also need to update /etc/fstab to mount all this on boot. Add there two lines:
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echo "Update /etc/fstab mit uuid Spezifizierung"
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# uuid from Dev
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uuid=$(lsblk -n -o UUID $rootdev)
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sudo echo "UUID=$uuid /swap btrfs defaults,subvol=@swap 0 0" >> /etc/fstab
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sudo echo "/swap/swapfile none swap sw 0 0" >> /etc/fstab
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# The UUID is the one of your /dev/sda1.
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echo "Fertig! Swap ist nun im Subvol @swap"
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sudo swapon |