make swap bigger on luks?

how to make a swap bigger on luks?
by default it is only 2 GB
I want 16GB swap


cat /etc/crypttab
nvme0n1p3_crypt UUID=5453a2d7-a805-4c46-8830-1b40b4e0820b none luks,discard
cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/mapper/vgkubuntu-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/nvme0n1p2 during installation
UUID=6e64ffd7-9479-49aa-924e-189f61ea1158 /boot ext4 defaults 0 2
# /boot/efi was on /dev/nvme0n1p1 during installation
UUID=E1D2-69BA /boot/efi vfat umask=0077 0 1
/dev/mapper/vgkubuntu-swap_1 none swap sw 0 0

lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 4K 1 loop /snap/bare/5
loop1 7:1 0 373.8M 1 loop /snap/anbox/186
loop2 7:2 0 105.4M 1 loop /snap/core/16574
loop3 7:3 0 104M 1 loop /snap/core/16928
loop4 7:4 0 63.9M 1 loop /snap/core20/2182
loop5 7:5 0 63.9M 1 loop /snap/core20/2264
loop6 7:6 0 74.1M 1 loop /snap/core22/1033
loop7 7:7 0 74.2M 1 loop /snap/core22/1122
loop8 7:8 0 267.5M 1 loop /snap/firefox/3941
loop9 7:9 0 268.3M 1 loop /snap/firefox/4090
loop10 7:10 0 349.7M 1 loop /snap/gnome-3-38-2004/140
loop11 7:11 0 349.7M 1 loop /snap/gnome-3-38-2004/143
loop12 7:12 0 497M 1 loop /snap/gnome-42-2204/141
loop13 7:13 0 504.2M 1 loop /snap/gnome-42-2204/172
loop14 7:14 0 91.7M 1 loop /snap/gtk-common-themes/1535
loop15 7:15 0 103.2M 1 loop /snap/pac-vs/1
loop16 7:16 0 147M 1 loop /snap/shotcut/1389
loop17 7:17 0 40.4M 1 loop /snap/snapd/20671
loop18 7:18 0 39.1M 1 loop /snap/snapd/21184
loop19 7:19 0 417.9M 1 loop /snap/telegram-desktop/5783
loop20 7:20 0 417.9M 1 loop /snap/telegram-desktop/5791
loop21 7:21 0 310.8M 1 loop
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 512M 0 part /boot/efi
├─nvme0n1p2 259:2 0 1.7G 0 part /boot
└─nvme0n1p3 259:3 0 951.7G 0 part
└─nvme0n1p3_crypt 252:0 0 951.7G 0 crypt
├─vgkubuntu-root 252:1 0 929.4G 0 lvm /var/snap/firefox/common/host-hunspell
│ /
└─vgkubuntu-swap_1 252:2 0 1.9G 0 lvm [SWAP]


Filesystem Size Used Avail Use% Mounted on
tmpfs 1.6G 2.6M 1.6G 1% /run
/dev/mapper/vgkubuntu-root 914G 325G 543G 38% /
tmpfs 7.7G 298M 7.4G 4% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
efivarfs 246K 108K 134K 45% /sys/firmware/efi/efivars
/dev/nvme0n1p2 1.7G 301M 1.3G 20% /boot
/dev/nvme0n1p1 511M 6.1M 505M 2% /boot/efi
tmpfs 1.6G 108K 1.6G 1% /run/user/1000

LUKS is irrelevant in this context. Reduce the root lv (and filesystem of course) - then you have a couple of choices:
- delete and reallocate the swap lv, making sure to use the same UUID
- or add a new lv for a second swap extent.

Originally Posted by syg00 LUKS is irrelevant in this context. Reduce the root lv (and filesystem of course) - then you have a couple of choices: - delete and reallocate the swap lv, making sure to use the same UUID - or add a new lv for a second swap extent.

how to do it?

Why do you think you need bigger swap ?.

You can (and should) allocate extra swap as plain filesystem files and you can add as many as you like as described e.g. here https://docs.oracle.com/cd/E24457_01...988/giprn.html Storing swap on separate partitions or volumes is a dated approach.

sudo swapon -s
sudo swapoff /dev/dm-2
sudo fallocate -l 16g /swapfile
chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

nano /etc/fstab
/swapfile none swap sw 0 0

*solved*