{"id":5846,"date":"2017-07-10T07:44:06","date_gmt":"2017-07-10T07:44:06","guid":{"rendered":"https:\/\/cpanelplesk.com\/wp62\/?p=5846"},"modified":"2021-02-01T05:47:31","modified_gmt":"2021-02-01T05:47:31","slug":"enable-swap-ubuntu-systems","status":"publish","type":"post","link":"https:\/\/cpanelplesk.com\/wp62\/enable-swap-ubuntu-systems\/","title":{"rendered":"How to Enable Swap on Ubuntu systems"},"content":{"rendered":"<p><span style=\"color: #000000;\">Swap is very useful for those systems which required more RAM If memory is full services got crashed due to insufficient memory. In this situation system required more RAM to run applications properly as it check for swap space and transfer files there. <\/span><!--more--><\/p>\n<p><span style=\"color: #000000;\">In general terms, So the creation of<a href=\"https:\/\/cpanelplesk.com\/wp62\/how-to-add-swap-file-on-centos-server\/\"> Swap file<\/a> is better to keep the services up.<\/span><\/p>\n<p><a href=\"https:\/\/cpanelplesk.com\/wp62\/enable-swap-ubuntu-systems\/how-to-add-swap-on-ubuntu\/\" rel=\"attachment wp-att-5848\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-5848 pleslwp\" src=\"https:\/\/cpanelplesk.com\/wp62\/wp-content\/uploads\/2017\/07\/how-to-add-swap-on-ubuntu.jpg\" alt=\"\" width=\"480\" height=\"360\" srcset=\"https:\/\/cpanelplesk.com\/wp62\/wp-content\/uploads\/2017\/07\/how-to-add-swap-on-ubuntu.jpg 480w, https:\/\/cpanelplesk.com\/wp62\/wp-content\/uploads\/2017\/07\/how-to-add-swap-on-ubuntu-300x225.jpg 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/p>\n<h3><span style=\"color: #000000;\">Check System Swap<\/span><\/h3>\n<p><span style=\"color: #000000;\">Before proceeding further make sure that system already has swap enabled. If there are no swap, you will get output header only.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"output-sh\">\n<pre>sudo swapon -s<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Create Swap File <\/span><\/h3>\n<p><span style=\"color: #000000;\">Now we will create a file to use for swap in system. Before making file make sure you have enough free space on disk. Normally, it is recommends that swap size should be equal to double of installed physical memory.<\/span><\/p>\n<p><span style=\"color: #000000;\">We have 2GB memory in my system. So will create <a href=\"https:\/\/cpanelplesk.com\/wp62\/how-to-clear-swap-cache\/\">swap<\/a> of 4GB in size.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo fallocate -l 4G \/swapfile\r\nchmod 600 \/swapfile<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Make It Swap<\/span><\/h3>\n<p><span style=\"color: #000000;\">Now we make it usable file using mkswap command.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo mkswap \/swapfile<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Enable Swap<\/span><\/h3>\n<p><span style=\"color: #000000;\">Now setup the <a href=\"https:\/\/cpanelplesk.com\/wp62\/find-out-which-process-is-using-swap-in-linux\/\">swap<\/a> for system using swapon command.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo swapon \/swapfile<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now again check that swap is enabled or not. You will see results something like below.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo swapon -s\r\n\r\nFilename Type Size Used Priority\r\n\/swapfile file 4194300 0 -1<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Setup Swap Permanent<\/span><\/h3>\n<p><span style=\"color: #000000;\">Add the following entry in \/etc\/fstab file to enable swap on system reboot.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>nano \/etc\/fstab\r\n\r\n\/swapfile none swap sw 0 0<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Setup Kernel Parameter<\/span><\/h3>\n<p><span style=\"color: #000000;\">Now time to change the swappiness kernel parameter as per your requirement. It will tell the system how often system utilize this swap area.<\/span><\/p>\n<p><span style=\"color: #000000;\">Edit \/etc\/sysctl.conf file and add following configuration in file.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo nano \/etc\/sysctl.conf<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\"><strong>vm.swappiness=10<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">Now reload the sysctl configuration file<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo sysctl -p<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, you have successfully enabled swap on your Ubuntu system.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Swap is very useful for those systems which required more RAM If memory is full services got crashed due to insufficient memory. In this situation system required more RAM to run applications properly as it check for swap space and transfer files there. [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/cpanelplesk.com\/wp62\/enable-swap-ubuntu-systems\/\">Continue Reading&#8230;<\/a><\/p>\n","protected":false},"author":2,"featured_media":5849,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-5846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Enable Swap on Ubuntu systems - cPanel Plesk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cpanelplesk.com\/wp62\/enable-swap-ubuntu-systems\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"How to Enable Swap on Ubuntu systems - cPanel Plesk\" \/>\n<meta name=\"twitter:description\" content=\"Swap is very useful for those systems which required more RAM If memory is full services got crashed due to insufficient memory. 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