查看当前版本
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8$ uname -r
3.10.0-514.el7.x86_64
$ uname -a
Linux kube-master 3.10.0-957.el7.x86_64 #1 SMP Wed May 27 12:54:35 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)添加源
导入ELRepo仓库的公共密钥
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org安装ELRepo仓库的yum源
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm查看可用内核版本
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24[root@kube-master ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
已加载插件：fastestmirror
Determining fastest mirrors
* elrepo-kernel: mirror-hk.koddos.net
elrepo-kernel | 2.9 kB 00:00:00
elrepo-kernel/primary_db | 1.9 MB 00:00:11
可安装的软件包
elrepo-release.noarch 7.0-4.el7.elrepo elrepo-kernel
kernel-lt.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 4.4.225-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
perf.x86_64 5.6.15-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.6.15-1.el7.elrepo elrepo-kernel升级内核
yum -y --enablerepo=elrepo-kernel install kernel-ml设置grub2
查看系统上的所有可用内核
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4[root@kube-master ~]# sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux (5.6.15-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)
2 : CentOS Linux (0-rescue-f44735dc8ec740208d9aff79b23edd9e) 7 (Core)设置新的内核为grub2的默认版本
grub2-set-default 0验证
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6[root@kube-master ~]# uname -a
Linux kube-master 5.6.15-1.el7.elrepo.x86_64 #1 SMP Wed May 27 12:54:35 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@kube-master ~]# uname -r
5.6.15-1.el7.elrepo.x86_64
[root@kube-master ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)