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Append script to create ZFS swap volume #22

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Append script to create ZFS swap volume #22

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4105a6b
Update proxmox-zfs-postinstall.sh, add sections for creating a zfs sw…
simonhoffmann Oct 10, 2023
31be2d6
Update proxmox-zfs-postinstall.sh, fix if queries
simonhoffmann Oct 14, 2023
5e09ee3
Update proxmox-zfs-postinstall.sh
simonhoffmann Oct 14, 2023
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37 changes: 37 additions & 0 deletions proxmox-zfs-postinstall.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,30 @@ if [[ "$(echo $RESULT | awk '{print tolower($0)}')" == "n" ]]; then
fi
fi

#### Create Swapfile ####

echo -e "######## Configure Swapfile ########\n"

read -p "With the default PVE-root on ZFS installation, no swap is created. Do you want to create a swapfile/zfs swap volume dataset? (y/n)" swapfile_userinput_bool
if [ $swapfile_userinput_bool == "y" ]; then
read -p "Name for the swap dataset? Leave empty to use default 'swap'" swapfile_userinput_name
if [ x$swapfile_userinput_name == "x" ]; then
swapfile_name="swap";
else
swapfile_name=$swapfile_userinput_name;
fi
read -p "Size for the swap volume in G, only numbers" swapfile_userinput_size
if echo "$swapfile_userinput_size" | grep -qE '^[0-9]+$'; then
swapfile_size=$swapfile_userinput_size;
else
echo "No valid input detected, falling back to 20G Swap Size";
swapfile_size="20";
fi
else
echo "No swapfile will be created"
fi


#### SWAPPINESS ####

echo -e "######## CONFIGURE SWAPPINESS ########\n"
Expand Down Expand Up @@ -213,6 +237,19 @@ for interval in "${!auto_snap_keep[@]}"; do
fi
done


if [ $swapfile_userinput_bool == "y" ]; then
echo "Creating swapfile"
zfs create -V ${swapfile_size}G -b $(getconf PAGESIZE) -o logbias=throughput -o sync=always -o primarycache=metadata -o com.sun:auto-snapshot=false rpool/$swapfile_name
echo "Formatting swapfile"
mkswap -f /dev/zvol/rpool/$swapfile_name
echo "Turning on swap"
swapon /dev/zvol/rpool/$swapfile_name
echo "Adding swapfile to fstab"
echo "/dev/zvol/rpool/$swapfile_name none swap discard 0 0" >> /etc/fstab
fi


echo "Configuring swappiness"
echo "vm.swappiness=$SWAPPINESS" > /etc/sysctl.d/swappiness.conf
sysctl -w vm.swappiness=$SWAPPINESS
Expand Down