Notice
This article is mainly used to upgrade the kernel before docker installation.
If necessary, please back up important data first
Before the update, the kernel version was:
uname -r
3.10.0-327.10.1.el7.x86_64
How to upgrade:
1. Import key
rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
2. Install the yum source of elrepo (you can visit ELRepo for the latest version )
rpm -Uvh rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
3. Install the kernel
yum –enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml
The default boot order starts from 0, and the new kernel is inserted from the beginning (the current position is 0, and 4.4.4 is at 1), so you need to choose 0.
grub2-set-default 0
Then reboot, use the new kernel, the following is the kernel version used after reboot:
uname -r
4.4.4-1.el7.elrepo.x86_64
4. Remove the old kernel
yum remove kernel
Reference: https://blog.csdn.net/silentwolfyh/article/details/52047780