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https://codeberg.org/Computertruhe/Setup-Skripte.git
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62 lines
1.7 KiB
Bash
62 lines
1.7 KiB
Bash
#!/bin/sh
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TODO: Das muss noch entwickelt geteset werden
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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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sudo mount /dev/sda1 /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 /dev/sda1 /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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# uuid from Dev
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uuid=$(lsblk -n -o UUID /dev/sda1)
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sudo echo "UUID=$uuid /swap btrfs subvol=@swap 0 0 /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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