Managing swap memory in Linux

Managing swap memory in Linux
In this video, I would like to show you how to both disable and enable swap memory on a Linux system.
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[@streamerking13]

Thanks for sharing... awesome video.

[@GulianTechnology]

Thank you, @streamerking13! 🙂

[@boringboringboringboring]

What kind of distro is it?

[@GulianTechnology]

I used Ubuntu 22.04 in the above video. However, the same things apply to other distributions as well.

[@boringboringboringboring]

Will it work for Manjaro?

[@GulianTechnology]

Yes. Please check below.
   ~  cat /etc/os-release  ✔  petru@petru-manjaro23
NAME="Manjaro Linux"
PRETTY_NAME="Manjaro Linux"
ID=manjaro
ID_LIKE=arch
BUILD_ID=rolling
ANSI_COLOR="32;1;24;144;200"
HOME_URL="manjaro.org/"
DOCUMENTATION_URL="wiki.manjaro.org/"
SUPPORT_URL="forum.manjaro.org/"
BUG_REPORT_URL="docs.manjaro.org/reporting-bugs/"
PRIVACY_POLICY_URL="manjaro.org/privacy-policy/"
LOGO=manjarolinux
   ~  free -h  ✔  petru@petru-manjaro23
total used free shared buff/cache available
Mem: 7.8Gi 1.2Gi 6.2Gi 23Mi 685Mi 6.6Gi
Swap: 5.0Gi 0B 5.0Gi
   ~  sudo swapoff -a  ✔  petru@petru-manjaro23
[sudo] password for petru:
   ~  free -h  ✔  3s   petru@petru-manjaro23
total used free shared buff/cache available
Mem: 7.8Gi 1.2Gi 6.2Gi 23Mi 688Mi 6.6Gi
Swap: 0B 0B 0B
   ~  sudo swapon -a  ✔  petru@petru-manjaro23
   ~  free -h  ✔  petru@petru-manjaro23
total used free shared buff/cache available
Mem: 7.8Gi 1.2Gi 6.2Gi 23Mi 691Mi 6.6Gi
Swap: 5.0Gi 0B 5.0Gi
   ~   ✔  petru@petru-manjaro23

[@boringboringboringboring]

Will swap be enabled again after reboot,if I disable swap on Manjaro this way?@@GulianTechnology

[@GulianTechnology]

@@boringboringboringboring Give it a try and you will find the answer. 🙂

[@GulianTechnology]

@@boringboringboringboring [petru@rocky9 ~]$ free -h
total used free shared buff/cache available
Mem: 3.6Gi 1.6Gi 936Mi 39Mi 1.3Gi 2.0Gi
Swap: 4.0Gi 0B 4.0Gi
[petru@rocky9 ~]$ sudo swapoff -a
[petru@rocky9 ~]$ free -h
total used free shared buff/cache available
Mem: 3.6Gi 1.6Gi 937Mi 39Mi 1.3Gi 2.0Gi
Swap: 0B 0B 0B
[petru@rocky9 ~]$ shutdown -r now
Call to Reboot failed: Interactive authentication required.
[petru@rocky9 ~]$ sudo shutdown -r now
[petru@rocky9 ~]$ Connection to 172.16.10.121 closed by remote host.
Connection to 172.16.10.121 closed.
pgulian@pgulian-ltm1 ~ % ssh petru@172.16.10.121
petru@172.16.10.121's password:
Permission denied, please try again.
petru@172.16.10.121's password:
Activate the web console with: systemctl enable --now cockpit.socket
Last failed login: Wed Jan 31 16:27:19 GMT 2024 from 172.16.10.20 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Wed Jan 31 16:26:16 2024 from 172.16.10.20
[petru@rocky9 ~]$ free -h
total used free shared buff/cache available
Mem: 3.6Gi 744Mi 2.6Gi 14Mi 508Mi 2.8Gi
Swap: 4.0Gi 0B 4.0Gi

[@GulianTechnology]

@boringboringboringboring If you want to disable the swap permanently, you need to remove/comment the entry from the /etc/fstab file.
Before:
[petru@rocky9 ~]$ cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Thu Oct 19 05:54:58 2023
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/rl-root / xfs defaults 0 0
UUID=333e7a34-65cd-45e6-8e17-8111c24d57f0 /boot xfs defaults 0 0
/dev/mapper/rl-swap none swap defaults 0 0
[petru@rocky9 ~]$
[petru@rocky9 ~]$ sudo vim /etc/fstab
After editing the /etc/fstab file.
[petru@rocky9 ~]$ cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Thu Oct 19 05:54:58 2023
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/rl-root / xfs defaults 0 0
UUID=333e7a34-65cd-45e6-8e17-8111c24d57f0 /boot xfs defaults 0 0
#/dev/mapper/rl-swap none swap defaults 0 0
[petru@rocky9 ~]$