查看当前内核版本
$ uname -r
3.10.0-514.el7.x86_64
$ uname -a
Linux k8s-master 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core) 导入密钥更新yum源
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum makecaceh 查看Epel源中可用内核
root@a.b:/etc/yum.repos.d # yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Failed to set locale, defaulting to C
Loaded plugins: elrepo
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Available Packages
kernel-lt-devel.x86_64 4.4.242-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 4.4.242-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 4.4.242-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 4.4.242-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 4.4.242-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 4.4.242-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
perf.x86_64 5.9.7-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.9.7-1.el7.elrepo elrepo-kernel安装最新内核
root@a.b:/etc/yum.repos.d # yum --enablerepo=elrepo-kernel install kernel-ml
Failed to set locale, defaulting to C
Loaded plugins: elrepo
elrepo-kernel | 3.0 kB 00:00:00
elrepo-kernel/primary_db | 1.8 MB 00:00:00
[elrepo]: 67 kmod packages excluded due to dependency errors
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:5.10.1-1.el7.elrepo will be installed
--> Finished Dependency Resolution配置内核启动顺序
查看启动顺序
[root@hecs-x-medium-2-linux-20200411110030 ~]# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg 0 : CentOS Linux (5.10.1-1.el7.elrepo.x86_64) 7 (Core) 1 : CentOS Linux (3.10.0-1160.6.1.el7.x86_64) 7 (Core) 2 : CentOS Linux (3.10.0-1160.6.1.el7.centos.plus.x86_64) 7 (Core) 3 : CentOS Linux (3.10.0-1062.1.1.el7.x86_64) 7 (Core) 4 : CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core) 5 : CentOS Linux (3.10.0-957.5.1.el7.x86_64) 7 (Core) 6 : CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core) 7 : CentOS Linux (0-rescue-4284cfe27c5b48c38adde30f33b4bb60) 7 (Core)更新启动顺序
grub2-set-default 0 ## 这里的0是上面查看的配置文件中的启动内核的序号生成配置文件，并重启
$ grub2-mkconfig -o /boot/grub2/grub.cfg Generating grub configuration file ... Found linux image: /boot/vmlinuz-4.18.7-1.el7.elrepo.x86_64 Found initrd image: /boot/initramfs-4.18.7-1.el7.elrepo.x86_64.img Found linux image: /boot/vmlinuz-3.10.0-862.11.6.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-862.11.6.el7.x86_64.img Found linux image: /boot/vmlinuz-3.10.0-514.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-514.el7.x86_64.img Found linux image: /boot/vmlinuz-0-rescue-063ec330caa04d4baae54c6902c62e54 Found initrd image: /boot/initramfs-0-rescue-063ec330caa04d4baae54c6902c62e54.img done $ reboot
验证
[root@hecs-x-medium-2-linux-20200411110030 ~]# uname -a
Linux hecs-x-medium-2-linux-20200411110030 5.10.1-1.el7.elrepo.x86_64 #1 SMP Mon Dec 14 14:16:47 EST 2020 x86_64 x86_64 x86_64 GNU/Linux