How to solved KERNEL PANIC CentOS 7

I have solved the problem, if you want to upgrade your CentOS kernel, you must excute following steps:

excuting yum install -y kernel or yum update -y kernel command;

excuting vi /etc/default/grub command, set GRUB_DEFAULT=0, it means that the first kernel will be default kernel;

excuting grub2-mkconfig -o /boot/grub2/grub.cfg command(CentOS 7.0 version), it aimes to generate a new kernel configuration;

reboot your system.

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