当前系统
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-1160.59.1.el7.x86_64 #1 SMP Wed Feb 23 16:47:03 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux将系统更新到最新
[root@localhost ~]# yum -y update添加ELRepo仓库
[root@localhost ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
[root@localhost ~]# rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm查看可以安装的内核版本
[root@localhost ~]# yum list available --disablerepo='*' --enablerepo=elrepo-kernel
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* elrepo-kernel: elrepo.org
elrepo-kernel | 3.0 kB 00:00:00
elrepo-kernel/primary_db | 2.0 MB 00:00:02
Available Packages
elrepo-release.noarch 7.0-5.el7.elrepo elrepo-kernel
kernel-lt.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 5.4.182-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
perf.x86_64 5.16.12-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.16.12-1.el7.elrepo elrepo-kernel可以选择带lt或mt的进行安装，其中lt表示long-term，ml表示latest mainline，这里装lt
[root@localhost ~]# yum --enablerepo=elrepo-kernel install kernel-lt
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* elrepo: mirror.rackspace.com
* elrepo-kernel: mirror.rackspace.com
* extras: mirrors.huaweicloud.com
* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package kernel-lt.x86_64 0:5.4.182-1.el7.elrepo will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=================================================================================================================================
Package Arch Version Repository Size
=================================================================================================================================
Installing:
kernel-lt x86_64 5.4.182-1.el7.elrepo elrepo-kernel 50 M
Transaction Summary
=================================================================================================================================
Install 1 Package
Total download size: 50 M
Installed size: 228 M
Is this ok [y/d/N]: y
Downloading packages:
kernel-lt-5.4.182-1.el7.elrepo.x86_64.rpm | 50 MB 00:01:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : kernel-lt-5.4.182-1.el7.elrepo.x86_64 1/1
Verifying : kernel-lt-5.4.182-1.el7.elrepo.x86_64 1/1
Installed:
kernel-lt.x86_64 0:5.4.182-1.el7.elrepo
Complete!
设置默认启动
[root@localhost ~]# cat /boot/grub2/grub.cfg |grep "menuentry " | awk -F\' '{print $2}'
CentOS Linux (5.4.182-1.el7.elrepo.x86_64) 7 (Core)
CentOS Linux (3.10.0-1160.59.1.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)
CentOS Linux (0-rescue-7b02b47c80952b47b8f12e9ea264eb57) 7 (Core)
[root@localhost ~]# grub2-set-default 'CentOS Linux (5.4.182-1.el7.elrepo.x86_64) 7 (Core)'
[root@localhost ~]# grub2-editenv list
saved_entry=CentOS Linux (5.4.182-1.el7.elrepo.x86_64) 7 (Core)
完毕。
参考文章：
https://phoenixnap.com/kb/how-to-upgrade-kernel-centos