Do note down and list enabled repos: Login using the ssh command: My fully patched CentOS 8 stable ready for migration to CentOS Stream<\/p>\n\n\n\n Let us install the CentOS-Stream release file by typing the following dnf command: Installing CentOS-Stream release files<\/p>\n\n\n\n Now we have the required package is in place. In other words, the dnf is ready to provide a simple way for us to start migrating from CentOS 8 to CentOS Stream. But, first, we must swap repos. The following command will remove CentOS 8 repo and replace it with the CentOS Stream repo. We will get all updates and libs\/apps from CentOS Stream. Execute the following command: First list repos, run: We are now close to our target. Next, we need to get packages for CentOS Stream ABI\/API<\/a>. This will upgrade or downgrade packages to match the new ABI\/API and break 100% RHEL compatibility due to ABI\/API change. I am OK with that. So let us do it: Run: See CentOS stream version<\/a> for verification: Some dnf repos may be renamed or disabled to prevent upgrade issues. It would be best if you validated those manually. For example: Here is a quick video demo:<\/p>\n\n\n\n I am pleasantly surprised by how smoothly the process went. This saved me time. I am also aware that one can take a similar approach to switch to AlmaLinux or RocyLinux, or Oracle Linux by swapping repos. For now, my side project working smoothly on AWS EC2 VM. But, one can use self-hosted or other cloud service providers too. I also deployed a local Rocky Linux VM on my Laptop, where I will containerize my app, so I no longer have to depend on the host OS. That is why I didn\u2019t waste much time with a completely new OS. Do check out the CentOS Stream website for documentation<\/a>.<\/p>\n\n\n\n Ref: https:\/\/www.cyberciti.biz\/howto\/upgrade-migrate-from-centos-8-to-centos-stream-conversion\/<\/p>\n","protected":false},"excerpt":{"rendered":" Author: Vivek Gite Step 1 \u2013 Backup Like every seasoned developer and sysadmin, I backed up all my project files, MySQL database and config files. So if something goes wrong, I should be able to go back quickly. That is all. Hence, keep verified backups. I have following software installed: ELEP repo enabled for CentOS 8 Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[262,5],"tags":[1173,1172],"class_list":["post-4140","post","type-post","status-publish","format-standard","hentry","category-centos","category-linux","tag-migrate-centos-8-to-centos-stream","tag-migrate-from-centos-8-to-centos-stream"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/posts\/4140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4140"}],"version-history":[{"count":3,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/posts\/4140\/revisions"}],"predecessor-version":[{"id":4143,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=\/wp\/v2\/posts\/4140\/revisions\/4143"}],"wp:attachment":[{"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/SUMMALAI.COM\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}# yum repolist
# yum repolist enabled > \/root\/pre.update.dnf.repo.txt<\/code><\/p>\n\n\n\nStep 2 \u2013 Installing all updates on CentOS 8<\/h2>\n\n\n\n
ssh {userName}@{your-Server-Name-IP-Here}
# for example:
ssh vivek@nixcraft-centos-httpd<\/code>
Next, simply run the dnf command:sudo dnf update<\/code>
Then reboot the Linux box<\/a> using the shutdown command<\/a> or reboot command<\/a>:sudo shutdown -r now<\/code>
Let us verify CentOS Linux 8 version using the cat command<\/a>\/more command<\/a> or less command<\/a>:more \/etc\/centos-release<\/code>![\"Migrate](\"https:\/\/www.cyberciti.biz\/media\/new\/cms\/2021\/12\/Migrate-from-CentOS-8-to-CentOS-Stream-Verification.png\")
<\/p>\n\n\n\nStep 3 \u2013 Installing CentOS Stream package<\/h2>\n\n\n\n
sudo dnf in centos-release-stream<\/code>![\"How](\"https:\/\/www.cyberciti.biz\/media\/new\/cms\/2021\/12\/How-to-Migrate-CentOS-8-Installation-to-CentOS-Stream-Using-DNF.png\")
<\/p>\n\n\n\nStep 4 \u2013 Migrating From CentOS 8 to CentOS Stream<\/h2>\n\n\n\n
sudo dnf swap centos-linux-repos centos-stream-repos<\/code><\/p>\n\n\n\nLast metadata expiration check: 0:07:46 ago on Friday 03 December 2021 05:14:03 PM UTC.\nDependencies resolved.\n========================================================================================<\/strong>\n Package Architecture Version Repository Size\n=<\/strong>=======================================================================================\nInstalling:\n centos-stream-release noarch 8.6-1.el8 Stream-BaseOS 22 k\n replacing centos-linux-release.noarch 8.5-1.2111.el8\n replacing centos-release-stream.x86_64 8.1-1.1911.0.7.el8\n centos-stream-repos noarch 8-3.el8 extras 19 k\nRemoving:\n centos-linux-repos noarch 8-3.el8 @baseos 26 k\n \nTransaction Summary\n=<\/strong>=======================================================================================\nInstall 2 Packages\nRemove 1 Package\n \nTotal download size: 42 k\nIs this ok [y\/N]<\/strong>: y\nDownloading Packages:\n(1\/2): centos-stream-repos-8-3.el8.noarch.rpm 588 kB\/s | 19 kB 00:00 \n(2\/2): centos-stream-release-8.6-1.el8.noarch.rpm 61 kB\/s | 22 kB 00:00 \n----------------------------------------------------------------------------------------\nTotal 91 kB\/s | 42 kB 00:00 \nRunning transaction check\nTransaction check succeeded.\nRunning transaction test\nTransaction test succeeded.\nRunning transaction\n Preparing : 1\/1 \n Running scriptlet: centos-stream-release-8.6-1.el8.noarch 1\/1 \n Installing : centos-stream-release-8.6-1.el8.noarch 1\/5 \n Installing : centos-stream-repos-8-3.el8.noarch 2\/5 \n Obsoleting : centos-release-stream-8.1-1.1911.0.7.el8.x86_64 3\/5 \n Obsoleting : centos-linux-release-8.5-1.2111.el8.noarch 4\/5 \n Erasing : centos-linux-repos-8-3.el8.noarch 5\/5 \nwarning: \/etc\/yum.repos.d\/CentOS-Linux-PowerTools.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-PowerTools.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-Plus.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-Plus.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-HighAvailability.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-HighAvailability.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-FastTrack.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-FastTrack.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-Extras.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-Extras.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-Devel.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-Devel.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-ContinuousRelease.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-ContinuousRelease.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-BaseOS.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-BaseOS.repo.rpmsave\nwarning: \/etc\/yum.repos.d\/CentOS-Linux-AppStream.repo saved as \/etc\/yum.repos.d\/CentOS-Linux-AppStream.repo.rpmsave\n \n Running scriptlet: centos-linux-repos-8-3.el8.noarch 5\/5 \n Verifying : centos-stream-repos-8-3.el8.noarch 1\/5 \n Verifying : centos-stream-release-8.6-1.el8.noarch 2\/5 \n Verifying : centos-linux-release-8.5-1.2111.el8.noarch 3\/5 \n Verifying : centos-release-stream-8.1-1.1911.0.7.el8.x86_64 4\/5 \n Verifying : centos-linux-repos-8-3.el8.noarch 5\/5 \n \nInstalled:\n centos-stream-release-8.6-1.el8.noarch centos-stream-repos-8-3.el8.noarch \nRemoved:\n centos-linux-repos-8-3.el8.noarch \n \nComplete!<\/pre>\n\n\n\n
Finally migrate CentOS 8 installation to CentOS stream<\/h3>\n\n\n\n
sudo dnf repolist<\/code><\/p>\n\n\n\nUpgrading CentOS 8 to CentOS Stream<\/h4>\n\n\n\n
sudo dnf distro-sync<\/code><\/p>\n\n\n\nLast metadata expiration check: 0:00:19 ago on Friday 03 December 2021 05:28:32 PM UTC.\nDependencies resolved.\n========================================================================================<\/strong>\n Package Arch Version Repo Size\n=<\/strong>=======================================================================================\nUpgrading:\n NetworkManager x86_64 1:1.36.0-0.1.el8 baseos 2.3 M\n NetworkManager-libnm x86_64 1:1.36.0-0.1.el8 baseos 1.8 M\n NetworkManager-team x86_64 1:1.36.0-0.1.el8 baseos 149 k\n NetworkManager-tui x86_64 1:1.36.0-0.1.el8 baseos 341 k\n bash x86_64 4.4.20-3.el8 baseos 1.5 M\n c-ares x86_64 1.13.0-6.el8 baseos 93 k\n ca-certificates noarch 2021.2.50-82.el8 baseos 390 k\n cloud-init noarch 21.1-9.el8 appstream 1.0 M\n cpio x86_64 2.12-11.el8 baseos 266 k\n cronie x86_64 1.5.2-6.el8 baseos 118 k\n cronie-anacron x86_64 1.5.2-6.el8 baseos 42 k\n crypto-policies noarch 20211116-1.gitae470d6.el8 baseos 64 k\n crypto-policies-scripts noarch 20211116-1.gitae470d6.el8 baseos 83 k\n device-mapper x86_64 8:1.02.181-1.el8 baseos 377 k\n device-mapper-libs x86_64 8:1.02.181-1.el8 baseos 409 k\n dnf noarch 4.7.0-5.el8 baseos 543 k\n dnf-automatic noarch 4.7.0-5.el8 baseo\n.....\n..\n vim-enhanced x86_64 2:8.0.1763-16.el8_5.2 appstream 1.4 M\n vim-filesystem noarch 2:8.0.1763-16.el8_5.2 appstream 49 k\n vim-minimal x86_64 2:8.0.1763-16.el8_5.2 baseos 573 k\n yum noarch 4.7.0-5.el8 baseos 206 k\nInstalling dependencies:\n glibc-gconv-extra x86_64 2.28-170.el8 baseos 1.4 M\nInstalling weak dependencies:\n sqlite x86_64 3.26.0-15.el8 baseos 668 k\nDowngrading:\n unzip x86_64 6.0-45.el8 baseos 195 k\n \nTransaction Summary\n=<\/strong>=======================================================================================\nInstall 2 Packages\nUpgrade 86 Packages\nDowngrade 1 Package\n \nTotal download size: 95 M\nDownloading Packages:\n(1\/89): unzip-6.0-45.el8.x86_64.rpm 571 kB\/s | 195 kB 00:00 \n(2\/89): sqlite-3.26.0-15.el8.x86_64.rpm 1.4 MB\/s | 668 kB 00:00 \n \n.....\n..\n vim-filesystem-2:8.0.1763-16.el8_5.2.noarch \n vim-minimal-2:8.0.1763-16.el8_5.2.x86_64 \n yum-4.7.0-5.el8.noarch \nDowngraded:\n unzip-6.0-45.el8.x86_64 \nInstalled:\n glibc-gconv-extra-2.28-170.el8.x86_64 sqlite-3.26.0-15.el8.x86_64 \n \nComplete!<\/pre>\n\n\n\n
Step 5 \u2013 Reboot the system<\/h2>\n\n\n\n
sudo systemctl reboot<\/code><\/p>\n\n\n\nStep 6 \u2013 Verification<\/h2>\n\n\n\n
![\"Upgrading](\"https:\/\/www.cyberciti.biz\/media\/new\/cms\/2021\/12\/Upgrading-CentOS-8-to-CentOS-Stream-Linux-using-DNF.png\")
<\/figure><\/div>\n\n\n\ncat \/etc\/centos-release<\/code>
Make sure there are no errors. Let us see or view errors log on Linux<\/a>:sudo tail -f \/var\/log\/messages
sudo grep -i -E 'err|wan|cri' \/var\/log\/messages
sudo grep -i -E 'err|wan|cri' \/var\/log\/nginx\/error.log<\/code>
List open ports on Linux<\/a> and make sure services such as httpd, mysqld and stuff is running using the systemctl command or netstat command\/ss command:sudo ss -tulpn
systemctl status httpd
systemctl status mysqld<\/code><\/p>\n\n\n\nA note about 3rd party dnf repos<\/h3>\n\n\n\n
# yum repolist
# yum repolist enabled > \/root\/post.update.dnf.repo.txt
You can compare those two files:# cat \/root\/post.update.dnf.repo.txt
# cat \/root\/pre.update.dnf.repo.txt
# diff \/root\/pre.update.dnf.repo.txt \/root\/post.update.dnf.repo.txt<\/code>
Then enable missing repos again.<\/p>\n\n\n\nVideo demo<\/h2>\n\n\n\n
![\"\"\/](\"https:\/\/i.ytimg.com\/vi\/O2Eexp9SSSE\/hqdefault.jpg\")
<\/figure>\n\n\n\nSumming up<\/h2>\n\n\n\n