How to switch back from Oracle Kernel to RedHat? Post: 303022846

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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

09-08-2018

Registered User

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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LEARN ABOUT CENTOS

grub-reboot

GRUB-REBOOT(8)						  System Administration Utilities					    GRUB-REBOOT(8)

NAME

       grub-reboot - set the default boot entry for GRUB, for the next boot only

SYNOPSIS

       grub-reboot [OPTION] MENU_ENTRY

DESCRIPTION

       Set the default boot menu entry for GRUB, for the next boot only.

       -h, --help
	      print this message and exit

       -V, --version
	      print the version information and exit

       --boot-directory=DIR
	      expect GRUB images under the directory DIR/grub instead of the /boot/grub directory

       MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu items in submenus or sub-submenus require speci-
       fying the submenu components and then the menu item component. The titles should be separated using the greater-than character (>) with	no
       extra  spaces.  Depending on your shell some characters including > may need escaping. More information about this is available in the GRUB
       Manual in the section about the 'default' command.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       grub-set-default(8), grub-editenv(1)

       The full documentation for grub-reboot is maintained as a Texinfo manual.  If the info and grub-reboot programs are properly  installed	at
       your site, the command

	      info grub-reboot

       should give you access to the complete manual.

grub-reboot (GRUB) 2.02-2ubuntu8.3				     July 2018							    GRUB-REBOOT(8)