In order to change the default boot kernel in CentOS/RHEL/OEL 5 & 6 proceed to perform the following steps: 1. Edit the file /boot/grub/grub.conf using a text editor. The GRUB configuration file starts with the default, timeout, splashimage, and hiddenmenu directives, it should looks like the one in the following example.
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CentOS/RHEL/OEL 5 and 6 operating system uses GRUB as the default boot loader. When you install a kernel using either rpm, up2date or yum application, the kernel package creates an entry in the boot loader configuration file for that new kernel. However, rpm does not configure the new kernel to boot as the default kernel, up2date and yum does. You must do this manually when installing a new kernel with rpm, and double-check the boot loader configuration file after installing a new kernel with u2date or yum to ensure that the configuration is correct.
When you already have different kernels previously installed and desire to boot with different to what is set on the default in the GRUB configuration file you have to change the default kernel to boot with.
In order to change the default boot kernel in CentOS/RHEL/OEL 5 & 6 proceed to perform the following steps: Affinity photo beta 1 8 2 173 x 2.
1. Edit the file /boot/grub/grub.conf using a text editor.
The GRUB configuration file starts with the default, timeout, splashimage, and hiddenmenu directives, it should looks like the one in the following example:
The directive “default” (marked red in the example) specifies the kernel entry that GRUB should boot by default.
GRUB counts the kernel entries in the configuration file starting at 0. The directive “default=0” means that GRUB boots the first kernel entry by default, unless you override this action.
2. Change the value of “default” to the value of the desired kernel to boot by default, that correspond to any of the installed kernels. Set the value from “0” to the desired one corresponding to the default kernel you need to boot with.
In the above example there are 3/5-line stanzas that each refer to an installed kernel. These stanzas always start with a title entry, after which the associated root, kernel and initrd directives should always be indented. Ensure that each stanza starts with a title that contains a version number (in parentheses) that matches the version number in the kernel /vmlinuz-[version_number] line of the same stanza.
The example contains 4 different kernels installed (Example is from OEL 6 system):
Change to:
3. Reboot the system.
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4. Once the server is back up and running make sure the default kernel booted is the correct by running “uname” command: