{"id":5652,"date":"2021-01-16T17:11:37","date_gmt":"2021-01-16T08:11:37","guid":{"rendered":"http:\/\/www.catracing.org\/hendrb\/?p=5652"},"modified":"2021-01-16T17:11:37","modified_gmt":"2021-01-16T08:11:37","slug":"technical-converting-centos-8-web-server-to-oracle-linux","status":"publish","type":"post","link":"https:\/\/www.catracing.org\/hendrb\/technical-converting-centos-8-web-server-to-oracle-linux\/","title":{"rendered":"Technical &#8211; Converting CentOS 8 web server to Oracle Linux"},"content":{"rendered":"<h1 style=\"text-align: center;\"><span style=\"color: #0000ff;\"><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-5667 size-thumbnail\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640-150x150.png\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640-150x150.png 150w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640-300x298.png 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640-100x100.png 100w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/tux-worker-161507_640.png 640w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>Technical \u2013 Oracle Linux \u201cOL\u201d) Drop In Replacement For CentOS 8.<\/span><\/h1>\n<hr>\n<p>Last month we blogged the news that RHEL has decided to prematurely end support for CentOS 8 on 31 Dec 2021.&nbsp; This has left IT departments scrambling to find a replacement before the end of the year.&nbsp; There are several options, and most of them including switching to a Red Hat support license require a complete reinstall of your server, applications, and the migration of data. &nbsp;Compounded with the &nbsp;time testing and fixing any issues that may arrive stress levels are on the rise as the clock is ticking. &nbsp;<\/p>\n<p>&nbsp; There is one option that does not require you to reinstall everything, and that is to convert to Oracle Linux 8, which is also a rebranded RHEL 8, and offers an easy script to convert your system from RHEL \/ CentOS 8 to OL 8. &nbsp;The script will automatically reconfigure the system to download and install the needed kernel and other files. &nbsp;Simply reboot after the conversion is complete. &nbsp;The conversion installs the Oracle Unbreakable Kernel by default but If you need 100% code compatibility with RHEL 8, you can switch to use the RHEL Kernel.<\/p>\n<p>&nbsp; So how does this work?&nbsp; Is it really as easy as advertised?&nbsp; I converted Brent\u2019s World To Oracle Enterprise Linux on Jan 01 2021, and I can honestly say for me it was! The entire process took about 4 hours, with the complete backup of the VM and its associated disks taking up the majority of that time.<\/p>\n<p>&nbsp;<br \/>\nHere are the steps I took.<\/p>\n<p>&nbsp; I made of copy of the VMWARE folder, and placed it on a separate drive, This was mostly done in the event the conversion was not successful, not of losing a drive in the process.<\/p>\n<p>I downloaded the centos2ol.sh script from GitHub<\/p>\n<p>&nbsp; I copied the test from GitHub, put it in a text editor on the server and gave it executable permissions.<\/p>\n<p>&nbsp; The easiest way however is to download it using curl.<\/p>\n<p>&nbsp; From a shell prompt <span style=\"color: #ffff00;\">$ curl -O sudo https:\/\/raw.githubusercontent.com\/oracle\/centos2ol\/main\/centos2ol.sh<\/span><\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-5654\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github-1024x102.jpg\" alt=\"\" width=\"1024\" height=\"102\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github-1024x102.jpg 1024w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github-300x30.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github-768x77.jpg 768w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/curl-from-github.jpg 1059w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>&nbsp; Grant execution privileges to the script using chmod.<br \/>\n<span style=\"color: #ffff00;\"># chmod 776 centos2ol.sh<\/span><\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-5653\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776-1024x50.jpg\" alt=\"\" width=\"1024\" height=\"50\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776-1024x50.jpg 1024w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776-300x15.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776-768x37.jpg 768w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-chmod-776.jpg 1047w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>&nbsp; Verify the script is now executable by listing the directory with the -l option or use the ll alias.<\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-5659 aligncenter\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod-1024x101.jpg\" alt=\"\" width=\"1024\" height=\"101\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod-1024x101.jpg 1024w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod-300x30.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod-768x76.jpg 768w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Long-list-LL-after-chmod.jpg 1047w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>&nbsp;We are now ready to execute the script<\/p>\n<p>&nbsp; I would recommend stopping any web or database services before the install. I did on my production box, but not before starting the install on the demo box for this blog.&nbsp; At the very least this will keep users from connecting to your web applications and database during the install and reboot.<\/p>\n<p>&nbsp; Unless the script was downloaded into a location that is in your system path, execute the script by typing sudo .\/centos2ol.sh<\/p>\n<p>The script will now run.&nbsp; Note the kernel version BEFORE the script is run.<\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Centos-Kernel-before-update.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5655 alignleft\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Centos-Kernel-before-update.png\" alt=\"\" width=\"662\" height=\"96\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Centos-Kernel-before-update.png 662w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Centos-Kernel-before-update-300x44.png 300w\" sizes=\"auto, (max-width: 662px) 100vw, 662px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>What the script will do is redirect YUM to the Oracle repositories and replace the Kernel and necessary files.<\/p>\n<p>&nbsp; When the script is complete go ahead and reboot your Linux server, note the different Kernel information after the reboot.<\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-Kernel-after-update.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5660 alignleft\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-Kernel-after-update.png\" alt=\"\" width=\"712\" height=\"102\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-Kernel-after-update.png 712w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/OL-Kernel-after-update-300x43.png 300w\" sizes=\"auto, (max-width: 712px) 100vw, 712px\" \/><\/a><\/p>\n<p>We are done!!&nbsp; How easy was that?<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp; The script installed Oracles Unbreakable Kernel, if you or your application or organization require a 100% RHEL compliant Kernel.&nbsp; Follow the steps below to switch to using the RHEL kernel.<\/p>\n<p>Let is take a look at the kernels available to us on our newly installed Oracle Linux.<br \/>\nAt the command prompt, enter the following command.<br \/>\n<span style=\"color: #ffff00;\"># sudo grubby -\u2013info=ALL | grep ^kernel<\/span><\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/All-installed-Kernels.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5664\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/All-installed-Kernels.jpg\" alt=\"\" width=\"885\" height=\"153\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/All-installed-Kernels.jpg 885w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/All-installed-Kernels-300x52.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/All-installed-Kernels-768x133.jpg 768w\" sizes=\"auto, (max-width: 885px) 100vw, 885px\" \/><\/a><\/p>\n<p>This will list all of the Linux kernels currently present on your workstation\/server.<\/p>\n<p>You can verify which kernel is currently the default kernel by issuing the following command.<br \/>\n<span style=\"color: #ffff00;\"># sudo grubby -\u2013default-kernel<\/span><\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Show-Default-UEK.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-5666\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Show-Default-UEK.jpg\" alt=\"\" width=\"885\" height=\"50\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Show-Default-UEK.jpg 885w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Show-Default-UEK-300x17.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Show-Default-UEK-768x43.jpg 768w\" sizes=\"auto, (max-width: 885px) 100vw, 885px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>It should show what we already know, that we are using Oracles UEK kernel.<br \/>\nIt does, so let us now switch to the RHEL kernel.&nbsp; We need to first find the absolute path to the kernel.&nbsp; We do that by first copying information between the quotes of the kernel directive of the second item on the list of installed kernels. Then enter the following command.<\/p>\n<p><span style=\"color: #ffff00;\"># sudo grubby \u2013set-default &lt;paste&gt;<\/span><\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Set-Default-Kernel.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5661 alignleft\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Set-Default-Kernel.jpg\" alt=\"\" width=\"892\" height=\"47\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Set-Default-Kernel.jpg 892w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Set-Default-Kernel-300x16.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Set-Default-Kernel-768x40.jpg 768w\" sizes=\"auto, (max-width: 892px) 100vw, 892px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>If the command is successful, you should see the following output.<\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Succesfull-switch.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-5662\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Succesfull-switch.jpg\" alt=\"\" width=\"892\" height=\"75\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Succesfull-switch.jpg 892w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Succesfull-switch-300x25.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Succesfull-switch-768x65.jpg 768w\" sizes=\"auto, (max-width: 892px) 100vw, 892px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Now reboot the system to load the newly selected RHEL kernel.<br \/>\n<span style=\"color: #ffff00;\"># reboot<\/span><\/p>\n<p>When the system is back up, login and check the kernel version with the uname command. &nbsp;<br \/>\n# sudo uname -r<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Verification.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-5663\" src=\"http:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Verification.jpg\" alt=\"\" width=\"892\" height=\"51\" srcset=\"https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Verification.jpg 892w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Verification-300x17.jpg 300w, https:\/\/www.catracing.org\/hendrb\/wp-content\/uploads\/2021\/01\/Verification-768x44.jpg 768w\" sizes=\"auto, (max-width: 892px) 100vw, 892px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>We should now see that we are using the RHEL kernel.<\/p>\n<p>That is all there is to converting a CentOS 8 system to Oracle Enterprise Linux!&nbsp; I hope you found this blog informative, and that you will come back for next month\u2019s technical blog.<\/p>\n<h4><span style=\"color: #ff0000;\">Some notes on this blog.<\/span><\/h4>\n<p>&nbsp; It is considered poor practice to use the root account to perform maintenance on a NIX server.&nbsp; The best practice is to use a user account with granular privileges granted in the SUDOERS file, and perform the commands using sudo (Super User do).&nbsp; I configured a demo VM for the purpose of getting screenshots and used root for expedience only!<\/p>\n<p>DISCLAIMER: I am not responsible for loss of data, or downtime incurred by using the steps and procedures in this blog!&nbsp; Follow best practices and your employer\u2019s policies if attempting this upgrade.&nbsp;<\/p>\n<p>&nbsp; I am not affiliated with Oracle in any way, the steps outlined here should in no way substitute for official Oracle installation best practices or support.<\/p>\n<p>Thank you for visiting Brent\u2019s World.&nbsp; If you find this content helpful and wish to be notified when new content is posted, please consider registering to receive an email notification when new content is posted.&nbsp; You register by clicking <a href=\"http:\/\/www.catracing.org\/hendrb\/wp-login.php\"><span style=\"color: #00ffff;\">HERE<\/span><\/a>!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical \u2013 Oracle Linux \u201cOL\u201d) Drop In Replacement For CentOS 8. Last month we blogged the news that RHEL has decided to prematurely end support for CentOS 8 on 31 Dec 2021.&nbsp; This has left IT departments scrambling to find <span class=\"excerpt-dots\">&hellip;<\/span> <a class=\"more-link\" href=\"https:\/\/www.catracing.org\/hendrb\/technical-converting-centos-8-web-server-to-oracle-linux\/\"><span class=\"more-msg\">Continue reading &rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3],"tags":[],"class_list":["post-5652","post","type-post","status-publish","format-standard","hentry","category-technical"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Technical - Converting CentOS 8 web server to Oracle Linux - Brent&#039;s World<\/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:\/\/www.catracing.org\/hendrb\/technical-converting-centos-8-web-server-to-oracle-linux\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Technical - Converting CentOS 8 web server to Oracle Linux - Brent&#039;s World\" \/>\n<meta property=\"og:description\" content=\"Technical \u2013 Oracle Linux \u201cOL\u201d) Drop In Replacement For CentOS 8. 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