CentOS7 更新最新内核

解决 CenOS7 不能直接升级内核的解决方法，

[root@xx ]# yum --enablerepo=elrepo-kernel install kernel-lt -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* elrepo: lon.mirror.rackspace.com
* elrepo-kernel: lon.mirror.rackspace.com
No package kernel-lt available.
Error: Nothing to do

内核下载地址：https://elrepo.org/linux/kernel/el7/x86_64/RPMS/

内核选择

kernel-lt（lt=long-term）长期有效

kernel-ml（ml=mainline）主流版本

安装过程

1.下载内核

wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-ml-5.2.4-1.el7.elrepo.x86_64.rpm

2.安装内核

rpm -ivh kernel-ml-5.2.4-1.el7.elrepo.x86_64.rpm

3.查看当前默认内核

# grub2-editenv list
saved_entry=CentOS Linux (3.10.0-327.28.3.el7.x86_64) 7 (Core)

4.查看所有内核启动 grub2

# awk -F \' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg 
0 : CentOS Linux (5.2.4-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-327.28.3.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-327.22.2.el7.x86_64) 7 (Core)
3 : CentOS Linux (3.10.0-327.13.1.el7.x86_64) 7 (Core)
4 : CentOS Linux, with Linux 0-rescue-cd8c4444947b4b0b818457f51ded6591

5.修改为最新的内核启动

grub2-set-default 'CentOS Linux (5.2.4-1.el7.elrepo.x86_64) 7 (Core)'

6.再次查看内核

# grub2-editenv list
saved_entry=CentOS Linux (5.2.4-1.el7.elrepo.x86_64) 7 (Core)

7.重新启动

reboot

更新 kernel-ml-headers

wget http://ftp.osuosl.org/pub/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-headers-5.2.4-1.el7.elrepo.x86_64.rpm
rpm -ivh kernel-ml-headers-5.2.4-1.el7.elrepo.x86_64.rpm

更新 kernel-ml-devel

http://ftp.osuosl.org/pub/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-5.2.4-1.el7.elrepo.x86_64.rpm
rpm -ivh kernel-ml-devel-5.2.4-1.el7.elrepo.x86_64.rpm

CentOS7 更新最新内核 | RPM 直接安装内核