{"id":625,"date":"2020-12-28T23:26:12","date_gmt":"2020-12-29T02:26:12","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/how-to-update-centos-7-8-kernel\/"},"modified":"2025-11-18T00:58:36","modified_gmt":"2025-11-18T03:58:36","slug":"how-to-update-centos-7-8-kernel","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/en\/how-to-update-centos-7-8-kernel\/","title":{"rendered":"How to Update CentOS 7\/8 Kernel"},"content":{"rendered":"<div id=\"helps-1164000700\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<h1 class=\"wp-block-heading\" id=\"h-how-to-update-centos-7-or-8-kernel\">How to Update CentOS 7 or 8 Kernel<\/h1>\n\n\n\n<p>A quick introduction, after all, what is the Kernel?<\/p>\n\n\n\n<p>The Kernel is the fundamental layer of the operating system. It works at the most basic level and is responsible for managing resources, ram, CPU etc&#8230;<\/p>\n\n\n\n<p>Kernel starts when server or PC starts and recognizes components, GPU, memory, peripherals. In other words the Kernel is the heart of <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a>.<\/p>\n\n\n\n<p>Okay, now for the steps to securely update the CentOS 7 or 8 Kernel.<\/p>\n\n\n\n<p>As a source for our update, we will use the ELRepo repository which is a community repository for Enterprise Linux distributions (Red Hat Enterprise Linux (RHEL), CentOS, Scientific Linux).<\/p>\n\n\n\n<p>ELRepo focuses on hardware-related packages including file system drivers, graphics drivers, network drivers, sound card drivers, webcam, and many others.<\/p>\n\n\n\n<p>1 &#8211; Update, upgrade with Yum your CentOS and a reboot at the end:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>yum update -y; yum upgrade -y; reboot;<\/pre><\/div>\n\n\n\n<p>2 &#8211; Checking the Kernel version installed on the server<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>uname -snr<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-opt-id=552474916  fetchpriority=\"high\" decoding=\"async\" width=\"437\" height=\"101\" src=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/kernel-default-centos.jpg\" alt=\"Centos 7 default kernel\" class=\"wp-image-148\" srcset=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:437\/h:101\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/kernel-default-centos.jpg 437w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:300\/h:69\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/kernel-default-centos.jpg 300w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:230\/h:53\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/kernel-default-centos.jpg 230w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:350\/h:81\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/kernel-default-centos.jpg 350w\" sizes=\"(max-width: 437px) 100vw, 437px\" \/><figcaption class=\"wp-element-caption\">CentOS 7 default is Kernel 3.xx<\/figcaption><\/figure>\n\n\n\n<p>3 &#8211; Install the yum plugin which will allow a faster update<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>yum -y install yum-plugin-fastestmirror<\/pre><\/div>\n\n\n\n<p>4 &#8211; Check your CentOS version<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>cat \/etc\/os-release<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-opt-id=1320081061  fetchpriority=\"high\" decoding=\"async\" width=\"343\" height=\"319\" src=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/qual-versao-centos.jpg\" alt=\"What version of CentOS\" class=\"wp-image-149\" srcset=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:343\/h:319\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/qual-versao-centos.jpg 343w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:300\/h:279\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/qual-versao-centos.jpg 300w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:230\/h:214\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/qual-versao-centos.jpg 230w\" sizes=\"(max-width: 343px) 100vw, 343px\" \/><figcaption class=\"wp-element-caption\">Check CentOS version in PRETTY_NAME or REDHAT_SUPPORT_PRODUCT_VERSION<\/figcaption><\/figure>\n\n\n\n<p>5 &#8211; Add the gpg key from the ELRepo repository to the server.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>rpm --import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org<\/pre><\/div>\n\n\n\n<p>6 &#8211; According to your CentOS version, choose the option below:<\/p>\n\n\n\n<p>For CentOS 7:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>yum install https:\/\/www.elrepo.org\/elrepo-release-7.el7.elrepo.noarch.rpm<\/pre><\/div>\n\n\n\n<p>For CentOS 8:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>yum install https:\/\/www.elrepo.org\/elrepo-release-8.el8.elrepo.noarch.rpm<\/pre><\/div>\n\n\n\n<p>7 &#8211; Enable the repository and install the new Kernel<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>yum --enablerepo=elrepo-kernel install kernel-ml<\/pre><\/div>\n\n\n\n<p>At this point we have already installed the new Kernel, now let&#8217;s configure Grub2 to start with the new Kernel<\/p>\n\n\n\n<p>8 &#8211; Use the following command to list the Kernel options<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>awk -F' '$1==&quot;menuentry &quot; {print i++ &quot; : &quot; $2}' \/etc\/grub2.cfg<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-opt-id=1971167572  data-opt-src=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg\"  decoding=\"async\" width=\"812\" height=\"127\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%20100%%20100%%22%20width%3D%22100%%22%20height%3D%22100%%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%22100%%22%20height%3D%22100%%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\" alt=\"\" class=\"wp-image-150\" old-srcset=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:812\/h:127\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 812w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:300\/h:47\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 300w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:768\/h:120\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 768w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:230\/h:36\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 230w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:350\/h:55\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 350w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:480\/h:75\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/opcoes-kernel.jpg 480w\" \/><figcaption class=\"wp-element-caption\">See option 0 that we have Kernel 5.10.3.xx installed.<\/figcaption><\/figure>\n\n\n\n<p>9 &#8211; Tell Grub the Kernel version you want to use<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>grub2-set-default 0<\/pre><\/div>\n\n\n\n<p>9 &#8211; Generate the grub2 config with the command &#8216;grub2-mkconfig&#8217; and then a reboot in CentOS Linux to apply the new kernel.<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>grub2-mkconfig -o \/boot\/grub2\/grub.cfg\nreboot<\/pre><\/div>\n\n\n\n<p>10 &#8211; After the reboot check the installed Kernel version<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>uname -snr<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-opt-id=1193992482  data-opt-src=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/versao-kernel.jpg\"  decoding=\"async\" width=\"392\" height=\"96\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%20100%%20100%%22%20width%3D%22100%%22%20height%3D%22100%%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%22100%%22%20height%3D%22100%%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\" alt=\"\" class=\"wp-image-151\" old-srcset=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:392\/h:96\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/versao-kernel.jpg 392w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:300\/h:73\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/versao-kernel.jpg 300w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:230\/h:56\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/versao-kernel.jpg 230w, https:\/\/mlkpd8g42nae.i.optimole.com\/w:350\/h:86\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/versao-kernel.jpg 350w\" \/><figcaption class=\"wp-element-caption\">Kernel Version<\/figcaption><\/figure>\n\n\n\n<p>After installing the new Kernel version, it is possible to optimize the performance and security of the server using sysctl which will act directly on the Kernel. Request <a href=\"https:\/\/helpsysadmin.com.br\">HelpSysAdmin<\/a> services for Kernel optimization and various other services of your server.<\/p>\n\n\n\n<p>See more: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/how-to-check-disk-i-o-speed-in-linux\/\"><strong>How to check disk I\/O speed in linux<\/strong><\/a><\/strong><br>See more: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/antivirus-antimalware-antiphishing-on-centos-or-cloudlinux-with-clamav\/\">Antivirus, Antimalware, Antiphishing on CentOS or Cloudlinux with ClamAV<\/a><\/strong><br>See more: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/almalinux-x-rock-linux\/\" target=\"_blank\" rel=\"noreferrer noopener\">Almalinux x Rock Linux<\/a><\/strong><br>Veja mais: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/almalinux-e-rock-linux\/\" target=\"_blank\" rel=\"noreferrer noopener\">Almalinux e Rock Linux<\/a><\/strong><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to Update CentOS 7 or 8 Kernel A quick introduction, after all, what is the Kernel? The Kernel is the fundamental [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":561,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1204],"tags":[1253,1257,1211,1215],"class_list":["post-625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server-management","tag-hundreds","tag-kernel-en","tag-linux-en","tag-safety"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Update CentOS 7\/8 Kernel - Blog HelpSysAdmin<\/title>\n<meta name=\"description\" content=\"How to update the CentOS 7 or 8 Kernel simply and securely\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/how-to-update-centos-7-8-kernel\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Update CentOS 7\/8 Kernel\" \/>\n<meta property=\"og:description\" content=\"How to update the CentOS 7 or 8 Kernel simply and securely\" \/>\n<meta property=\"og:url\" content=\"https:\/\/helpsysadmin.com.br\/blog\/en\/how-to-update-centos-7-8-kernel\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog HelpSysAdmin\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-29T02:26:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-18T03:58:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2020\/12\/atualizar-kernel.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"289\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"HelpSysAdmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@brhelpsysad\" \/>\n<meta name=\"twitter:site\" content=\"@brhelpsysad\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/\"},\"author\":{\"name\":\"HelpSysAdmin\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/#\\\/schema\\\/person\\\/bdbe3d7d71a0c6a3cb474c18da574efb\"},\"headline\":\"How to Update CentOS 7\\\/8 Kernel\",\"datePublished\":\"2020-12-29T02:26:12+00:00\",\"dateModified\":\"2025-11-18T03:58:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/\"},\"wordCount\":375,\"publisher\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/helpsysadmin.com.br\\/blog\\/wp-content\\/uploads\\/2020\\/12\\/atualizar-kernel.jpg\",\"keywords\":[\"hundreds\",\"kernel\",\"linux\",\"safety\"],\"articleSection\":[\"server management\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/\",\"url\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/how-to-update-centos-7-8-kernel\\\/\",\"name\":\"How to Update CentOS 7\\\/8 Kernel - 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