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Operating Systems Linux Red Hat How to switch back from Oracle Kernel to RedHat? Post 303022846 by Aia on Saturday 8th of September 2018 12:09:17 PM
Old 09-08-2018
Quote:
Originally Posted by prvnrk
I would like to know how can I switch from Oracle kernel to RHEL kernel without breaking anything.
Since there was no testing previously in an identical testing machine, this box has become the testing one now. No testing, no confidence in anything.
You can test if it doesn't break anything by rebooting and at the grub menu select the red Red Hat Enterprise Linux Server (3.10.0-862.9.1.el7.x86_64) 7.5 (Maipo). If it boots properly, check that if everything is what's expected. If everything is proper then change the entry in the grub.conf that says default=1 to default=2 which is the third kernel menu corresponding to that version of redhat supported kernel.
Perhaps it is easier to issue the command:
Code:
# grub2-set-default 2

That only makes the selection of which kernel to boot from, persistent on reboots and shutdowns.
Depending of the yum configuration there might be issues updating kernels, you might have to set it up to exclude kernels updates in from the oracle repo.
You might want to remove with yum or rpm the title Oracle Linux Server 7.5, with Unbreakable Enterprise Kernel 4.14.35-1818.0.9.el7uek.x86_64 and Oracle Linux Server 7.5, with Linux 3.10.0-862.11.6.el7.x86_64
A lot of testing.
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reposync(1)															       reposync(1)

NAME
reposync - synchronize yum repositories to a local directory SYNOPSIS
reposync [options] DESCRIPTION
reposync is used to synchronize a remote yum repository to a local directory, using yum to retrieve the packages. OPTIONS
-h, --help Display a help message, and then quit. -c CONFIG, --config=CONFIG Config file to use (defaults to /etc/yum.conf). -a ARCH, --arch=ARCH Act as if running the specified arch (default: current arch, note: does not override $releasever. x86_64 is a superset for i*86.). --source Also download .src.rpm files. -r REPOID, --repoid=REPOID Specify repo ids to query, can be specified multiple times (default is all enabled). -t, --tempcache Use a temp dir for storing/accessing yum-cache. -p DESTDIR, --download_path=DESTDIR Path to download packages to: defaults to current directory. -g, --gpgcheck Remove packages that fail GPG signature checking after downloading. exit status is '1' if at least one package was removed. -u, --urls Just list urls of what would be downloaded, don't download. -l, --plugins Enable yum plugin support. -n, --newest-only Download only newest packages per-repo. -q, --quiet Output as little information as possible. EXAMPLES
Sync all packages from the 'updates' repo to the current directory: reposync --repoid=updates Sync only the newest packages from the 'updates' repo to the current directory: reposync -n --repoid=updates Sync packages from the 'updates' and 'extras' repos to the current directory: reposync --repoid=updates --repoid=extras Sync all packages from the 'updates' repo to the repos directory: reposync -p repos --repoid=updates Sync all packages from the 'updates' repo to the repos directory excluding x86_64 arch. Edit /etc/yum.conf adding option exclude=*.x86_64. Then: reposync -p repos --repoid=updates FILES
reposync uses the yum libraries for retrieving information and packages. If no configuration file is specified, the default yum configura- tion will be used. /etc/yum.conf /etc/yum/repos.d/ SEE ALSO
yum.conf (5) http://yum.baseurl.org/ AUTHORS
See the Authors file included with this program. BUGS
There are of course no bugs, but should you find any, you should first consult the FAQ section on http://yum.baseurl.org/wiki/Faq and if unsuccessful in finding a resolution contact the mailing list: yum-devel@lists.baseurl.org. To file a bug use http://bugzilla.redhat.com for Fedora/RHEL/Centos related bugs and http://yum.baseurl.org/report for all other bugs. 27 April 2007 reposync(1)
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