In this easy to follow guide , we are looking at how to upgrade the OS without a YUM server. It may not be practical to setup a yum server for few linux servers but you can still upgrade the OS using the following process.
You will need the DVD media for the OS you would like to upgrade. In this example, the server needs to be upgraded from RHEL 7.4 to RHEL 7.6 version skipping 7.5
Please follow this guide on how to set up the local yum repo in your server.
- Copy the ISO DVD to the local server and mount the DVD
x [root@linuxlab01]# mount -o loop /yumrepo/rhel-server-7.6-x86_64-dvd.iso /repomount: /dev/loop0 is write-protected, mounting read-only[root@linuxlab01]# 2. Copy the media.repo file file the mounted DVD to /etc/yum.repos.d/
[root@linuxlab01 /]# cp /repo/media.repo /etc/yum.repos.d/RHEL76.repo[root@linuxlab01 /]# 3.Update the /etc/yum.repos.d/RHEL76.repo file with following options
enabled=1baseurl=file:///repo/gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-releaseAt the end the repo configuration file /etc/yum.repos.d/RHEL76.repo should look this
[InstallMedia]name=Red Hat Enterprise Linux 7.6mediaid=1539194970.388895metadata_expire=-1gpgcheck=0cost=500enabled=1baseurl=file:///repo/gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release 4. Rename the old RHEL7.4.repo file as RHEL74.disable, clean the yum cache and run yum repolist
#cd /etc/yum.repos.d/#mv RHEL74.repo RHEL74.repo.disable#yum clean all#yum repolistHere is the output from my server
[root@linuxlab01 /]# cd /etc/yum.repos.d/[root@linuxlab01 yum.repos.d]# mv RHEL74.repo RHEL74.repo.disable[root@linuxlab01 yum.repos.d]# yum clean allLoaded plugins: langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Cleaning repos: InstallMediaCleaning up everythingMaybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos[root@linuxlab01 yum.repos.d]# yum repolistLoaded plugins: langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.InstallMedia | 4.3 kB 00:00:00(1/2): InstallMedia/group_gz | 146 kB 00:00:00(2/2): InstallMedia/primary_db | 4.2 MB 00:00:00repo id repo name statusInstallMedia Red Hat Enterprise Linux 7.6 5,152repolist: 5,152[root@linuxlab01 yum.repos.d]#Now we are ready to upgrade the OS from RHEL 7.4 to 7.6. As a precaution, please make sure you take the necessary backup before the OS upgrade.
5. Run yum update, it will list all the packages will be upgraded as well as any new dependency packages part of the yum upgrade. Confirm “y” to continue with the OS upgrade.
[root@linuxlab01 ]# yum updateLoaded plugins: langpacks, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Resolving Dependencies--> Running transaction check----Install 9 Packages (+19 Dependent packages)Upgrade 374 PackagesTotal download size: 407 MIs this ok [y/d/N]: Y----Replaced: grub2.x86_64 1:2.02-0.64.el7 grub2-tools.x86_64 1:2.02-0.64.el7 python-rhsm.x86_64 0:1.19.9-1.el7 python-rhsm-certificates.x86_64 0:1.19.9-1.el7 redhat-access-insights.noarch 0:1.0.13-2.el7Complete![root@linuxlab01 /][root@linuxlab01 /]6. Once complete , verify the OS version
[root@linuxlab01 /]# cat /etc/redhat-releaseRed Hat Enterprise Linux Server release 7.6 (Maipo)[root@linuxlab01 /]#7. Reboot the server to load the newly installed Kernel images
[root@linuxlab01 /]#shutdown -r nowHope you find this tutorial useful and don’t forgot to share your thoughts!
