How to delete redundant boot entries in CentOS

After CentOS is updated, the old kernel will not be automatically deleted. Therefore, there will be multiple kernel options in the boot options. You can manually delete the redundant kernels using the following command:

1. Check the current kernel version of the system:

# uname -a

Linux localhost.localdomain 3.10.0-229.20.1.el7.x86_64 #1 SMP Tue Nov 3 19:10:07 UTC 201 GNU/Linux

2. View all kernel RPM packages in the system:

# rpm -qa | grep kernel

kernel-3.10.0-229.14.1.el7.x86_64

kernel-3.10.0-229.el7.x86_64

abrt-addon-kerneloops-2.1.11-22.el7.centos.0.1.x86_64

kernel-tools-libs-3.10.0-229.20.1.el7.x86_64

kernel-3.10.0-229.20.1.el7.x86_64

kernel-tools-3.10.0-229.20.1.el7.x86_64

3. Delete the RPM package of the old kernel

yum remove kernel-3.10.0-229.14.1.el7

yum remove kernel-3.10.0-229.el7

4. Restart the system

# reboot

Note: No need to manually modify /boot/grub/menu.lst

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