Modify the system kernel boot sequence If you do not modify the system grub2 bootloader, the kernel is still the system default, so modify the kernel boot order.

Terminal window
# cat /boot/grub2/grub.cfg | grep menuentry      # See how many cores the system has
menuentry 'CentOS Linux (3.10.0-1160.15.2.el7.x86_64) 7 (Core)'
menuentry 'CentOS Linux (5.11.3-1.el7.elrepo.x86_64) 7 (Core)'
menuentry 'CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)'
menuentry 'CentOS Linux (0-rescue-097bb8bd97af424eb2e46072fd2f5de2) 7 (Core)'

Setting the default boot kernel

Terminal window
# grub2-set-default "CentOS Linux (5.11.3-1.el7.elrepo.x86_64) 7 (Core)"

Verify that the modification was successful

Terminal window
# grub2-editenv list
saved_entry=CentOS Linux (5.11.3-1.el7.elrepo.x86_64) 7 (Core)

Reboot the system and then look at the kernel version

Terminal window
# reboot
# uname -r
5.11.3-1.el7.elrepo.x86_64

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Centos 7 Multiple Kernels Specify Default Startup Items
https://huoshen.pages.dev/p/e3838fa/
Author
Koevn
Published at
License
CC BY-NC-SA 4.0