直入主题安装
查看当前系统内核版本
[root@localhost ~]# uname -r
3.10.0-1160.71.1.el7.x86_64
安装ELREPO
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm -y
查看内核版本列表
[root@localhost ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
已加载插件:fastestmirror
Determining fastest mirrors
* elrepo-kernel: mirrors.tuna.tsinghua.edu.cn
elrepo-kernel | 3.0 kB 00:00:00
elrepo-kernel/primary_db | 2.1 MB 00:00:00
可安装的软件包
kernel-lt.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 6.6.5-1.el7.elrepo elrepo-kernel
perf.x86_64 5.4.263-1.el7.elrepo elrepo-kernel
**python-perf.x86_64**
安装
# 安装 最新版ML 版本
yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y
# 安装 最新版LT 版本
yum --enablerepo=elrepo-kernel install kernel-lt-devel kernel-lt -y
# 不带版本号就安装最新版本,这里我们安装 LT 5.4.263-1.el7.elrepo版本
# 安装 LT 版本,K8S全部选这个
yum --enablerepo=elrepo-kernel install kernel-lt-devel-5.4.263-1.el7.elrepo.x86_64 kernel-lt-5.4.263-1.el7.elrepo.x86_64 -y
查看系统上面可以使用的内核
[root@localhost ~]# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux (5.4.263-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (6.6.5-1.el7.elrepo.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-1160.71.1.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-58697ec5ce0a4c94920f34654eb57aa1) 7 (Core)
修改启动顺序默认值
方法1:命令操作
[root@localhost ~]# grub2-set-default 0
方法2:修改`/etc/default/grub` 文件
设置 `GRUB_DEFAULT=0`,通过上面查询显示的编号为 0 的内核作为默认内核:
$ vim /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved #saved改为0
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet net.ifnames=0 biosdevname=0"
GRUB_DISABLE_RECOVERY="true"
生产grub 配置文件
[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.6.5-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-6.6.5-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-5.4.263-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-5.4.263-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.71.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.71.1.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-58697ec5ce0a4c94920f34654eb57aa1
Found initrd image: /boot/initramfs-0-rescue-58697ec5ce0a4c94920f34654eb57aa1.img
done
重新启动
reboot
验证内核版本
[root@localhost ~]# uname -r
5.4.263-1.el7.elrepo.x86_64