Centos7 upgrade kernel

Before the update, the kernel version was:

uname -r  
3.10.0-327.10.1.el7.x86_64

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How to upgrade:

1. Import key

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org  

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2. Install the yum source of elrepo

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm  

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3. Install the kernel

yum --enablerepo=elrepo-kernel install  kernel-ml-devel kernel-ml  

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Currently 4.4.4:

======================================================================================================================================================
 Package                              架构                        版本                                       源                                  大小
======================================================================================================================================================
正在安装:
 kernel-ml                            x86_64                      4.4.4-1.el7.elrepo                         elrepo-kernel                       38 M
 kernel-ml-devel                      x86_64                      4.4.4-1.el7.elrepo                         elrepo-kernel                       10 M

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4. View the default startup sequence

awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg  
CentOS Linux (4.4.4-1.el7.elrepo.x86_64) 7 (Core)  
CentOS Linux (3.10.0-327.10.1.el7.x86_64) 7 (Core)  
CentOS Linux (0-rescue-c52097a1078c403da03b8eddeac5080b) 7 (Core)

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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  

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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  

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5. Remove the old kernel

yum remove kernel  


https://www.tesun.net/centos7sheng-ji-nei-he/