{"id":508,"date":"2021-07-02T06:48:32","date_gmt":"2021-07-02T11:48:32","guid":{"rendered":"https:\/\/www.knownhost.com\/kb\/?p=508"},"modified":"2022-01-25T06:04:03","modified_gmt":"2022-01-25T12:04:03","slug":"how-do-i-check-the-kernel-version-on-my-server","status":"publish","type":"post","link":"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/","title":{"rendered":"How do I check the kernel version on my server?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_1 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #212121;color:#212121\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #212121;color:#212121\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#what_is_a_kernel\" >What is a Kernel?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#checking_the_kernel_version\" >Checking the Kernel Version<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#upgrading_the_linux_kernel\" >Upgrading the Linux Kernel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#kernelcare_usage\" >KernelCare Usage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#removing_the_old_kernel_version\" >Removing the Old Kernel Version.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/#conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>In this article, we&#8217;re going to go over Linux kernels. We&#8217;ll show you what a kernel is and how to go about checking it and ensuring it&#8217;s up to date, but first let&#8217;s answer the common question when within a Linux environment or even any computer environment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what_is_a_kernel\"><\/span>What is a Kernel?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-768x1024.jpg\" alt=\"\" class=\"wp-image-2347\" width=\"371\" height=\"494\" srcset=\"https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-768x1024.jpg 768w, https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-225x300.jpg 225w, https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-1152x1536.jpg 1152w, https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-1536x2048.jpg 1536w, https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-scaled.jpg 1920w\" sizes=\"(max-width: 371px) 100vw, 371px\" \/><\/figure>\n\n\n\n<p>The Linux Kernel is the center most important part of an operating system, think of it as the brain of the whole operation. The kernel handles the operations of two primary components: memory and CPU time. It does this by processing the internal communication between the hardware and the software, this is performed through the use of system calls.<br><br>There&#8217;s no good example for this &#8212; your typical user won&#8217;t ever interact with the kernel as the functions it performs are behind the scenes and not visible in their daily operations.<\/p>\n\n\n\n<div id=\"block-7e4fd0-40ef-49\" class=\"wp-block-gutenbee-imagebox block-7e4fd0-40ef-49 wp-block-gutenbee-imagebox-align-center\"><style>.wp-block-gutenbee-imagebox.block-7e4fd0-40ef-49 .wp-block-gutenbee-imagebox-figure img { width: 525px; }<\/style><figure class=\"wp-block-gutenbee-imagebox-figure\"><img decoding=\"async\" src=\"https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/kernellayout-1.png\" alt=\"how a kernel works\"\/><\/figure><div class=\"wp-block-gutenbee-imagebox-content\"><p class=\"wp-block-gutenbee-imagebox-text\"><meta http-equiv=\"content-type\" content=\"text\/html; charset=utf-8\">Showing the jobs of a kernel within a computer<\/p><\/div><\/div>\n\n\n\n<p>Overall, there are three generic kernels available that you see in day-to-day systems, they are:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Microkernel &#8212; Designed to only contain basic functionality. (multitasking, memory administration, etc)<\/li><li>Monolithic Kernel &#8212; Designed to contain many device related drivers to handle multiple system functionality. (Ex. Linux)<\/li><li>Hybrid Kernel &#8212; Aggregated design of both micro and monolithic kernels. This was built with performance in mind. (Ex. Windows)<\/li><\/ul>\n\n\n\n<p>With that in mind, most if not all Linux Operating systems are based off a monolithic kernel. <br><br>Now you can move on to checking\/updating and\/or removing the various Linux kernel versions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"checking_the_kernel_version\"><\/span>Checking the Kernel Version<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To check system parameters such as the kernel version and build date,&nbsp;OS&nbsp;architecture, hostname, etc., you can use the&nbsp;<code>uname<\/code>&nbsp;command, which is included in&nbsp;<strong>coreutils<\/strong>&nbsp;package:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # uname -rv\n  3.10.0-693.11.6.el7.x86_64 #1 SMP Thu Jan 4 01:06:37 UTC 2018<\/code><\/pre>\n\n\n\n<p>To view the current kernel version and build date, run&nbsp;<code>uname -r<\/code>. Depending on the platform your server is running on, you may see slightly different output, even for the same CentOS 7 operating system.<\/p>\n\n\n\n<p>If you run a VPS (Virtual Private Server) as an OpenVZ container, you will see the &#8220;stab&#8221; in the kernel version:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # uname -r\n  2.6.32-042stab125.5<\/code><\/pre>\n\n\n\n<p>If you run CentOS 7 on a Dedicated Server or a KVM virtual server, you could see &#8220;el7&#8221; in the kernel version, which refers to Red Hat Enterprise Linux, from which CentOS is derived:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # uname -r\n  3.10.0-693.11.6.el7.x86_64<\/code><\/pre>\n\n\n\n<p>If you are running CloudLinux, you could see &#8220;lve&#8221; in the kernel version:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # uname -r\n  3.10.0-714.10.2.lve1.5.9.el7.x86_64<\/code><\/pre>\n\n\n\n<p>Another way to check would be with the following yum command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  yum info kernel -q<\/code><\/pre>\n\n\n\n<p>This command may run noticeably longer, because yum uses a python interpreter and one or more plugins by default. However, it gives more detailed information. This will usually only show the latest installed kernel and not the current running kernel.<br><br>Here is an example of possible output from this command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # yum info kernel -q\n  Available Packages\n  Name        : kernel\n  Arch        : x86_64\n  Version     : 3.10.0\n  Release     : 693.11.6.el7\n  Size        : 43 M\n  Repo        : updates\/7\/x86_64\n  Summary     : The Linux kernel\n  URL         : http:\/\/www.kernel.org\/\n  License     : GPLv2\n  Description : The kernel package contains the Linux kernel (vmlinuz), the core of any\n              : Linux operating system.  The kernel handles the basic functions\n              : of the operating system: memory allocation, process allocation, device\n              : input and output, etc.<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"upgrading_the_linux_kernel\"><\/span>Upgrading the Linux Kernel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>If you have a VPS as an OpenVZ container, it is not possible to upgrade your kernel independently, because all virtual containers run the same kernel loaded on the node. Therefore, voluntary upgrade can be performed only on Dedicated Servers and KVM-based virtual servers.<\/p>\n\n\n\n<p>To upgrade the kernel, you can run this&nbsp;<code>yum<\/code>&nbsp;command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  yum upgrade kernel<\/code><\/pre>\n\n\n\n<p>By default, this command should ask for confirmation to install new kernel:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  Is this ok &#91;y\/d\/N]:<\/code><\/pre>\n\n\n\n<p>If you want to skip the confirmation, you can use the&nbsp;<code>-y<\/code>&nbsp;switch (However, it is not recommended to skip confirmations unnecessarily, especially for big changes like new kernels, since these especially should not be performed accidentally):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  yum upgrade kernel -y<\/code><\/pre>\n\n\n\n<p>Once the new kernel is installed you need to load it. To do so, you need to reboot the server:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  reboot<\/code><\/pre>\n\n\n\n<p>Once the server has finished rebooting, you should check the loaded kernel version as described in previous section.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"kernelcare_usage\"><\/span>KernelCare Usage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>KernelCare is a live-patching software for Linux kernels distributed by CloudLinux. When using KernelCare, the server does not require rebooting for kernel upgrades, and kernel patches are checked and applied on the fly automatically every 4 hours. It is available only for Dedicated Servers and KVM virtual servers.<\/p>\n\n\n\n<p>You can check if KernelCare is installed as follows:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # yum info kernelcare -q\n  Installed Packages\n  Name        : kernelcare\n  Arch        : x86_64\n  Version     : 2.14\n  Release     : 2\n  Size        : 217 k\n  Repo        : installed\n  From repo   : kernelcare\n  Summary     : KernelCare tools\n  URL         : http:\/\/www.cloudlinux.com\n  License     : CLOUD LINUX LICENSE AGREEMENT\n  Description : KernelCare userland tools<\/code><\/pre>\n\n\n\n<p>To check if patches have been applied, run:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  kcarectl --info<\/code><\/pre>\n\n\n\n<p>More details about KernelCare can be found in the following places:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.kernelcare.com\/faqs\/\">KernelCare&#8217;s official FAQ<\/a><\/li><li><a href=\"https:\/\/docs.kernelcare.com\/\">KernelCare&#8217;s official Documentation<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"removing_the_old_kernel_version\"><\/span>Removing the Old Kernel Version.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sometimes you may need to remove old kernels from the server manually. To check all installed kernels, this&nbsp;<code>yum<\/code>&nbsp;command could be used again:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # yum list kernel -q\n  Installed Packages\n  kernel.x86_64            3.10.0-693.11.1.el7           @updates\n  kernel.x86_64            3.10.0-693.11.6.el7           @updates<\/code><\/pre>\n\n\n\n<p>Using the command&nbsp;<code>package-cleanup<\/code>&nbsp;with the&nbsp;<code>--oldkernels<\/code>&nbsp;switch would remove all old kernels, leaving only &#8216;<strong>count<\/strong>&#8216; most recent ones (by default&nbsp;<strong>count=2<\/strong>). For example, to remove all kernels except the one most recently installed and loaded, run the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  package-cleanup --oldkernels --count=1<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ensuring that the proper kernel is running on your server will go a long way in the stability and performance of how the system operates. Kernel patches occur often and help ensure a stable environment while protecting your system from any recent kernel-level vulnerabilities. <br><br>KnownHost offers 365 days a year, 24 hours a day, all 7 days of the week best in class technical support. A dedicated team is ready to help you with updating your kernel or general questions regarding it should you need our assistance. You&#8217;re not using KnownHost for the best web hosting experience? Well, why not? Check with <a href=\"https:\/\/www.knownhost.com\/contact\">our Sales team<\/a> to see what can KnownHost do for you in improving your web hosting experience.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we&#8217;re going to go over Linux kernels. We&#8217;ll show you what a kernel is and how to go about checking it and ensuring it&#8217;s up to date, but first let&#8217;s answer the common question when within a Linux environment or even any computer environment. What is a Kernel? The Linux Kernel is [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[92],"tags":[177,143,196,123,125],"class_list":["post-508","post","type-post","status-publish","format-standard","hentry","category-technical-support","tag-cloud","tag-dedicated","tag-kernel","tag-linux","tag-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How do I check the kernel version on my server? - KnownHost<\/title>\n<meta name=\"description\" content=\"Checking your linux kernel version is simple. Let us help you find out how to check, update or remove kernel versions on your server.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How do I check the kernel version on my server? - KnownHost\" \/>\n<meta property=\"og:description\" content=\"Checking your linux kernel version is simple. Let us help you find out how to check, update or remove kernel versions on your server.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.knownhost.com\/kb\/how-do-i-check-the-kernel-version-on-my-server\/\" \/>\n<meta property=\"og:site_name\" content=\"KnownHost\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-02T11:48:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-01-25T12:04:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.knownhost.com\/kb\/wp-content\/uploads\/2021\/08\/linuxkernel-768x1024.jpg\" \/>\n<meta name=\"author\" content=\"Jonathan K. W.\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jonathan K. 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