ChCh/Computertruhe-Setup-Skripte_codeberg
5
0
Fork 0
mirror of https://codeberg.org/Computertruhe/Setup-Skripte.git synced 2025-06-28 11:26:18 +02:00
Code Issues Projects Releases Wiki Activity

post-skript-swapon (#81)

Browse source 
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>
This commit is contained in:
B3rtl 2024-11-12 19:18:41 +00:00
parent 45a710a5a7
commit 6145d1fe13
1 changed files with 72 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

72
mint/make_swapvol.sh Normal file
View file

@ -0,0 +1,72 @@
#!/bin/bash
# skript baut ein subvol /@swap unten drunter und mountet das
# ganze als /swap um darin /swap/swapfile als swapspace
# zu aktivieren - größe 8G oder was man sich ausdenkt
# It is possible to use a swap file on btrfs, but there are some considerations that need taking care of.
# 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.
# 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.
# Mount /dev/sda1 to /mnt.
rootdevsrc=$(findmnt -nr -T / -osource)
echo "Mount / ist gebunden auf $rootdevsrc"
if [[ "$rootdevsrc" =~ \[/@]$ ]]
then
echo "Verwendung von btrfs subvol /@"
else
echo "Hier stimmt was nicht. $rootdevsrc enthält kein btrfs-subvol oder subvol ist nicht '/@'"
exit 1
fi
rootdev=${rootdevsrc%\[/@]}
echo "BTRFS-Device ist daher $rootdev"
echo "OK - erzeuge jetzt (etwas umständlich) ein SubVol /@swap, in dem swapfile liegt"
# zunächst nochmal mounten, damit die root-subvols sichtbar werden
sudo mount $rootdev /mnt
# If you run ls /mnt, you'll see @, @home and other subvolumes that may be there.
# Create a new @swap subvolume.
sudo btrfs sub create /mnt/@swap
# Unmount /dev/sda1 from /mnt.
sudo umount /mnt
# Create /swap directory where we plan to mount the @swap subvolume.
sudo mkdir /swap
# Mount the @swap subvolume to /swap.
sudo mount -o subvol=@swap $rootdev /swap
# Create the swap file.
sudo touch /swap/swapfile
# Set 600 permissions to the file.
sudo chmod 600 /swap/swapfile
# Disable COW for this file.
sudo chattr +C /swap/swapfile
# Set size of the swap file to 8G as an example.
sudo dd if=/dev/zero of=/swap/swapfile bs=1M count=8192
# Format the swapfile.
sudo mkswap /swap/swapfile
# Turn the swap file on.
sudo swapon /swap/swapfile
# Now the new swap should be working.
#
# You also need to update /etc/fstab to mount all this on boot. Add there two lines:
echo "Update /etc/fstab mit uuid Spezifizierung"
# uuid from Dev
uuid=$(lsblk -n -o UUID $rootdev)
sudo echo "UUID=$uuid /swap btrfs defaults,subvol=@swap 0 0" >> /etc/fstab
sudo echo "/swap/swapfile none swap sw 0 0" >> /etc/fstab
# The UUID is the one of your /dev/sda1.
echo "Fertig! Swap ist nun im Subvol @swap"
sudo swapon