1、 查看当前内核版本,以及系统版本：
# uname -r
3.10.0-1127.el7.x86_64
# cat /etc/redhat-release
CentOS Linux release 7.8.2003 (Core)
2 升级内核
yum update # 先进行系统的升级
3 配置ELRepo仓库源：
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
查看可用的版本内核：
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* elrepo-kernel: mirrors.tuna.tsinghua.edu.cn
elrepo-kernel | 2.9 kB 00:00:00
elrepo-kernel/primary_db | 1.8 MB 00:00:03
Available Packages
kernel-lt.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 4.4.155-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
perf.x86_64 4.18.7-1.el7.elrepo elrepo-kernel
python-perf.x86_64 4.18.7-1.el7.elrepo
ml代表稳定主线版本，lt代表长期版本
4 安装最新版本的mt内核：
# yum --enablerepo=elrepo-kernel install kernel-ml
5 设置新内核为grub2的默认版本。设置grub2（重启生效）
# 设置新内核为grub2的默认版本
grub2-set-default 'CentOS Linux (5.8.3-1.el7.elrepo.x86_64) 7 (Core)'
# 生成grub2配置文件
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
6 验证
# uname -r
5.8.3-1.el7.elrepo.x86_64
# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
[root@k8s-10-192-52-129 kernel]# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux (5.8.3-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-1127.18.2.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-1127.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-ac1984414f8c4d32b999d621c356e065) 7 (Core)
7 删除旧内核，旧内核的rpm包，并安装新内核工具包（可选）
#remove old kernel tools and instlal new kernel tools
yum -y remove kernel-tools-libs.x86_64 kernel-tools.x86_64
yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml-tools.x86_64
# 安装 最新版本 python-perf
yum -y install python-perf
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