Add Swap Space on CentOS 9 Stream

To Add 1GB Swap Space 

#create swap file

 sudo dd if=/dev/zero of=/swapfile bs=1024 count=1048576

1048576+0 records in

1048576+0 records out

1073741824 bytes (1.1 GB, 1.0 GiB) copied, 19.8022 s, 54.2 MB/s

#set permission

sudo chmod 600 /swapfile

#set up swap area file

sudo mkswap /swapfile

Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)

no label, UUID=53c7c8d2-ed2d-4f61-b263-79a4dcd94304

#activate swap

 sudo swapon /swapfile

sudo swapon --show

NAME      TYPE       SIZE USED PRIO

/dev/dm-1 partition  2.1G   4M   -2

/swapfile file      1024M   0B   -3

sudo free -h

               total        used        free      shared  buff/cache   available

Mem:           1.7Gi       898Mi        69Mi        12Mi       970Mi       852Mi

Swap:          3.1Gi       4.0Mi       3.1Gi

#make permenant entry

sudo vim /etc/fstab

/swapfile swap swap defaults 0 0

Ref:- add-swap-space-on-centos-9-stream