Create Swap Space in Linux

[root@testdb1]# free

              total        used        free      shared  buff/cache   available

Mem:        1014976       81368      122336       12944      811272      734480

Swap:             0           0           0

 [root@testdb1]# dd if=/dev/zero of=/swapfile bs=1024 count=1048576

1048576+0 records in

1048576+0 records out

1073741824 bytes (1.1 GB) copied, 13.2398 s, 81.1 MB/s

[root@testdb1]# ls -lh /swapfile

-rw-r--r--. 1 root root 1.0G May  8 10:05 /swapfile

 [root@testdb1]# chmod 600 /swapfile

[root@testdb1]# ls -lh /swapfile

-rw-------. 1 root root 1.0G May  8 10:06 /swapfile

[root@testdb1]# mkswap /swapfile

Setting up swapspace version 1, size = 1048572 KiB

no label, UUID=ba9da34a-d07a-40a4-bd13-c869a982349a

[root@testdb1]# swapon /swapfile

[root@testdb1]# free

              total        used        free      shared  buff/cache   available

Mem:        1014976       77136       72720       12944      865120      746420

Swap:       1048572           0     1048572

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