![\"How](\"https:\/\/unihost.com\/help\/minio.php?.\/template.png\" "\\"How")
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In this tutorial I will show you how to set up a swap file on CentOS 8 Swap is a space on a disk that is used when the amount of physical RAM memory is full. When a Linux system runs out of RAM, inactive pages are moved from the RAM to the swap space.<\/span><\/p>\n Before proceeding with this tutorial, check if your CentOS installation already has swap enabled by typing:<\/span><\/p>\n If the output is empty, it means that your system does not have swap space enabled.<\/span><\/p>\n In this example, we will create a swap file of size 4GB using fallocate command.<\/span><\/p>\n Make it readable only by root user.<\/span><\/p>\n Setup the file for swap space.<\/span><\/p>\n Enable the swap file and add it to the system as a swap file.<\/span><\/p>\n Edit the\u00a0\/etc\/fstab<\/em> file and add the next line, to make the change permanent.<\/span><\/p>\n Save and exit.<\/span><\/p>\n Now we can reboot our server and verify swap.<\/span><\/p>\n Or using the free<\/em> command.<\/span><\/p>\n Execute the following command to disable the swap file.<\/span><\/p>\n Remove \/swap swap swap defaults 0 0<\/em> entry from the \/etc\/fstab<\/em> file.\u00a0<\/span><\/p>\n Delete the swapfile file.<\/span><\/p>\n We have learned how to configure swap space on CentOS 8 system.<\/span><\/p>\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" In this tutorial I will show you how to set up a swap file on CentOS 8<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[158],"tags":[58,541],"class_list":["post-7671","post","type-post","status-publish","format-standard","hentry","category-dedicated-servers","tag-centos","tag-swap"],"yoast_head":"\n
<\/span><\/p>\n# swapon --show<\/span><\/pre>\nCreate swap file<\/span><\/h2>\n
# fallocate -l 4G \/swap<\/span><\/pre>\n# chmod 600 \/swap<\/span><\/pre>\n# mkswap \/swap <\/span>
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)<\/span>
no label, UUID=5c766682-0bec-4b16-a8aa-0756e5717792<\/span><\/pre>\n# swapon \/swap<\/span><\/pre>\n# nano \/etc\/fstab<\/span><\/pre>\n\/swap swap swap defaults 0 0<\/span><\/pre>\n# reboot<\/span><\/pre>\n# swapon --show<\/span>
NAME TYPE SIZE USED PRIO<\/span>
\/swap file 4G 0B -2<\/span><\/pre>\n# free -h<\/span>
total used free shared buff\/cache available<\/span>
Mem: 3.8Gi 140Mi 2.1Gi 16Mi 1.5Gi 3.3Gi<\/span>
Swap: 4.0Gi 0B 4.0Gi<\/span><\/pre>\nRemoving a swap file<\/span><\/h2>\n
# swapoff -v \/swap<\/span><\/pre>\n# rm \/swap<\/span><\/pre>\n