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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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repodiff(1)															       repodiff(1)

NAME
repodiff - list differences between two or more Yum repositories SYNOPSIS
repodiff --old=old_repo_baseurl --new=new_repo_baseurl DESCRIPTION
repodiff is a program which will list differences between two sets of repositories. Note that by default only source packages are com- pared. GENERAL OPTIONS
--old, -o Add a repo. as an old repo. Note that if you prefix the url with "mirror:" then the following url is treated as a mirror and not a baseurl. --new, -n Add a repo. as an new repo. Note that if you prefix the url with "mirror:" then the following url is treated as a mirror and not a baseurl. --archlist, -a Add architectures to change the default from just comparing source packages. Note that if you want the same as a native "x86_64" architecture machine you just need to pass "x86_64" (this is different from earlier versions where you needed to specify "x86_64,athlon,i686,i586,i486,i386,noarch" and you still got "src"). --size, -s Output additional data about the size of the changes. --compare-arch Normally packages are just compared based on their name, this flag makes the comparison also use the arch. So foo.i386 and foo.x86_64 are different. --simple Output a simple one line message for modified packages. --downgrade Split the data for modified packages between upgraded and downgraded packages. EXAMPLES
Compare source pkgs in two local repos: repodiff --old=/tmp/repo-old --new=/tmp/repo-new Compare x86_64 compat. binary pkgs in two remote repos, and two local one: repodiff -a x86_64 --old=http://example.com/repo1-old --old=/tmp/repo-old --new=http://example.com/repo1-new --new=/tmp/repo-new Compare x86_64 compat. binary pkgs, but also compare arch: repodiff -a x86_64 --compare-arch --old=http://example.com/repo1-old --old=/tmp/repo-old --new=http://example.com/repo1-new --new=/tmp/repo-new Compare two releases of Fedora (15 => 16): repodiff --old='mirror:https://mirrors.fedoraproject.org/metalink?repo=fedora-source-15&arch=i386' --new='mirror:https://mir- rors.fedoraproject.org/metalink?repo=fedora-source-16&arch=i386' --size --simple --downgrade 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. James Antill 21 October 2008 repodiff(1)
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