{"id":17108,"date":"2022-02-09T07:20:56","date_gmt":"2022-02-09T06:20:56","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/migrating-from-centos-8-to-almalinux-8\/"},"modified":"2024-09-10T17:37:39","modified_gmt":"2024-09-10T15:37:39","slug":"migrating-from-centos-8-to-almalinux-8","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/migrating-from-centos-8-to-almalinux-8\/","title":{"rendered":"Migrating from CentOS 8 to AlmaLinux 8"},"content":{"rendered":"

In our blogs we already talked about Migrating a CentOS 7 EC2 instance to Rocky Linux 8 <\/a> and CentOS 8 machine to Red Hat 8 <\/a>, but how does it look like if you want to migrate your CentOS8 machine to AlmaLinux 8?
\n
\nIndeed it is as simple as migrating from CentOS7 to Rocky Linux or to Red Hat 8, if not easier, because there is a great script in the Alma Linux GitHub repository<\/a>. If you have a deeper look at the script, you will recognize it checks a lot before starting to migrate and there are also some things that will terminate the migration e.g. if UEFI Secure Boot is enabled. <\/p>\n

First of all make sure you have a backup or snapshot of the machine you want to migrate. There is never a guarantee that everything runs smoothly. The migration itself is straight forward.<\/p>\n

1. Update your OS<\/h3>\n

Let’s start with checking the OS Version currently running on the machine.<\/p>\n

\n[root@linux1 ~]# cat \/etc\/os-release\nNAME=\"CentOS Linux\"\nVERSION=\"8\"\nID=\"centos\"\nID_LIKE=\"rhel fedora\"\nVERSION_ID=\"8\"\nPLATFORM_ID=\"platform:el8\"\nPRETTY_NAME=\"CentOS Linux 8\"\nANSI_COLOR=\"0;31\"\nCPE_NAME=\"cpe:\/o:centos:centos:8\"\nHOME_URL=\"https:\/\/centos.org\/\"\nBUG_REPORT_URL=\"https:\/\/bugs.centos.org\/\"\nCENTOS_MANTISBT_PROJECT=\"CentOS-8\"\nCENTOS_MANTISBT_PROJECT_VERSION=\"8\"\n[root@linux1 ~]# uname -a\nLinux linux1 4.18.0-305.12.1.el8_4.x86_64 #1 SMP Wed Aug 11 01:59:55 UTC 2021 x86_64 x86_64 x86_64 GNU\/Linux\n[root@linx1~]#\n<\/pre>\n
I am running Version 8.4, so necessarily I don’t need to update my system prior the migration. If you’re running a version older than CentOS 8.4 you need to update your OS before moving to AlmaLinux. Make sure you correct your dnf config files to a valid mirror because as of January 31, 2022 the CentOS mirrorlists are offline. Your dnf update will fail.<\/p>\n
\n[root@linux1 ~]# dnf update\nCentOS Linux 8 - AppStream                                                                                                                                                                                                                                                     3.6  B\/s |  38  B     00:10\nError: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist\n[root@linux1 ~]#\n<\/pre>\n
To fix your dnf config files run the following sed commands and restart your dnf update. Once done reboot your system.<\/p>\n
\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[baseos]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/BaseOS\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-BaseOS.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[appstream]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/AppStream\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-AppStream.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[cr]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/ContinuousRelease\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-ContinuousRelease.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[devel]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/Devel\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-Devel.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[extras]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/extras\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-Extras.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[fasttrack]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/fasttrack\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-FastTrack.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[ha]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/HighAvailability\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-HighAvailability.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[plus]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/centosplus\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-Plus.repo\nsed -i -e '\/mirrorlist=http:\/\/mirrorlist.centos.org\/?release=$releasever&arch=$basearch&repo=\/ s\/^#*\/#\/' -e '\/baseurl=http:\/\/mirror.centos.org\/$contentdir\/$releasever\/\/ s\/^#*\/#\/' -e '\/^[powertools]\/a baseurl=https:\/\/mirror.rackspace.com\/centos-vault\/8.5.2111\/PowerTools\/$basearch\/os' \/etc\/yum.repos.d\/CentOS-Linux-PowerTools.repo\n\ndnf update -y\n\nsystemctl reboot\n<\/pre>\n
2. Migrate to AlmaLinux<\/h3>\n
As soon as the machine is up to date you can download the almalinux-deploy.sh script from GitHub. <\/p>\n
\ncurl -O https:\/\/raw.githubusercontent.com\/AlmaLinux\/almalinux-deploy\/master\/almalinux-deploy.sh\n<\/pre>\n
Check if the script is executable, if not adjust it accordingly and start the migration.<\/p>\n
\n[root@linux1 ~]# ls -al almalinux-deploy.sh\n-rw-r--r-- 1 root root 34993 Feb  8 18:35 almalinux-deploy.sh\n[root@linux1 ~]# chmod 744 almalinux-deploy.sh\n[root@linux1 ~]# ls -al almalinux-deploy.sh\n-rwxr--r--  1 root root 34993 Feb  8 18:35 almalinux-deploy.sh\n[root@linux1 ~]#bash almalinux-deploy.sh\n<\/pre>\n
\"\"<\/a><\/p>\n
The duration of the migration depends of course on the number of installed packages. <\/p>\n
3. Finalize the migration<\/h3>\n
After the migration completed successfully, the machine should be rebooted to run with the new AlmaLinux Kernel.<\/p>\n
And as a last final check, ensure that the system convertion was successfully.<\/p>\n
\n[root@linux1 ~]# cat \/etc\/redhat-release\nAlmaLinux release 8.5 (Arctic Sphynx)\n\n\"\"<\/a>\n[root@linux1 ~]# grubby --info DEFAULT | grep AlmaLinux\ntitle=\"AlmaLinux (4.18.0-348.12.2.el8_5.x86_64) 8.5 (Arctic Sphynx)\"\n<\/pre>\n
Don’t forget to test all your applications carefully after you switched to AlmaLinux.<\/p>\n","protected":false},"excerpt":{"rendered":"
In our blogs we already talked about Migrating a CentOS 7 EC2 instance to Rocky Linux 8 and CentOS 8 machine to Red Hat 8 , but how does it look like if you want to migrate your CentOS8 machine to AlmaLinux 8?<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[42],"tags":[2476,72,73,46,153],"type_dbi":[],"class_list":["post-17108","post","type-post","status-publish","format-standard","hentry","category-operating-systems","tag-almalinux","tag-centos","tag-linux","tag-linux-unix","tag-operating-system"],"acf":[],"yoast_head":"\nMigrating from CentOS 8 to AlmaLinux 8 - dbi Blog<\/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.dbi-services.com\/blog\/migrating-from-centos-8-to-almalinux-8\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Migrating from CentOS 8 to AlmaLinux 8\" \/>\n<meta property=\"og:description\" content=\"In our blogs we already talked about Migrating a CentOS 7 EC2 instance to Rocky Linux 8 and CentOS 8 machine to Red Hat 8 , but how does it look like if you want to migrate your CentOS8 machine to AlmaLinux 8?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/migrating-from-centos-8-to-almalinux-8\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2022-02-09T06:20:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-09-10T15:37:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/02\/2022-02-08_18h37_21.png\" \/>\n<meta name=\"author\" content=\"Open source Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Open source Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/\"},\"author\":{\"name\":\"Open source Team\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/59554f0d99383431eb6ed427e338952b\"},\"headline\":\"Migrating from CentOS 8 to AlmaLinux 8\",\"datePublished\":\"2022-02-09T06:20:56+00:00\",\"dateModified\":\"2024-09-10T15:37:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/\"},\"wordCount\":341,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2022\\\/02\\\/2022-02-08_18h37_21.png\",\"keywords\":[\"AlmaLinux\",\"CentOS\",\"Linux\",\"Linux\\\/UNIX\",\"operating system\"],\"articleSection\":[\"Operating systems\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/\",\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/migrating-from-centos-8-to-almalinux-8\\\/\",\"name\":\"Migrating from CentOS 8 to AlmaLinux 8 - 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