Score:2

Ubuntu

Extend or create new swap file

G Ugauga

10/7/22, 1:17 PM

I have a kubuntu installation (Kubuntu 21.04), which during install created a swap file of 1Gb. Tryed to create a swap file of 4GB, using the following commands:

$ sudo -s
# dd if=/dev/zero of=/swapfile bs=1G count=4
# chown root:root /swapfile
# chmod 600 /swapfile
# ls -lh /swapfile
# mkswap /swapfile
# swapon /swapfile
# echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

And after it was like there was no swap, and my system had to be repaired (used a repair disk). Kubuntu is installed in an encrypted lvm2pv partition,(/dev/kubuntu-vg). Inside it there are /dev/kubuntu-vg/root mounted at / and /dev/kubuntu-vg/swap_1 ).

Should I try again and how to proceed? Thanks in advance.

1 + 7

swap

kubuntu

waltinator

10/7/22, 3:10 PM

swap files have to be contiguous, else the swapper gets confused.

heynnema

10/7/22, 3:17 PM

I'm not 1000% sure that you can use a /swapfile on an encrypted lvm. You may have to create a small swap partition on disk and then edit your /etc/fstab, or enlarge your /dev/kubuntu-vg/swap_1 and re-edit your /etc/fstab.

G Ugauga

10/7/22, 5:08 PM

@heynnema I can see with KDE partitionmanager, that swap file is inside encrypted volume. That means it is created , used encrypted and deleted after poweroff (??). I thought of creating a swap partition instead, but I am afraid of resizing an encrypted partition with all my data inside.

heynnema

10/7/22, 5:47 PM

The swap_1 partition (which is different than the /swapfile that you created) has no real data in it, and can be resized/extended using lvm commands. You should back out your /swapfile and the mods to /etc/fstab and work on extending swap_1 if you can. Show me `swapon -s` and `free -h`.

G Ugauga

10/7/22, 5:55 PM

@heynnema thanks for your support. $ swapon -s Filename Type Size Used Priority /dev/dm-2 partition 999420 9508 -2

heynnema

10/7/22, 6:01 PM

Yes. Back out your /swapfile and /etc/fstab changes. In terminal do "apropos lvm" and you'll see a resize command there, then do "man resize_command_name" for instructions. Report back later.

G Ugauga

10/8/22, 3:21 PM

@heynema I did as you proposed. I extended swap_1 partition and it was Ok. It helped me because initially thought it was a swap file. I will try later creating a swap file on my older laptop.

Score:2

Ubuntu

C.S.Cameron

10/7/22, 1:34 PM

I'm scared of dd, I use fallocate

Create the swap file:

sudo fallocate -l XG /swapfile

Where X is the swapfile size in GB
```
sudo mkswap /swapfile
sudo chmod 0600 /swapfile
sudo swapon /swapfile
```
Reboot:
```
sudo reboot
```
There is a slight possibility of getting holes in a swapfile when creating it with fallocate. /var/log/syslog can be searched for the phrase swapon: swapfile has holes to ensure there will be no data loss.

0 + 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Extend or create new swap file

TH: ขยายหรือสร้างไฟล์สลับใหม่

RO: Extindeți sau creați un nou fișier de schimb

RU: Расширить или создать новый файл подкачки

VI: Mở rộng hoặc tạo tệp hoán đổi mới

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