Centos 7 升级内核版本

1、查看当前的内核版本

uname -r
3.10.0-1127.19.1.el7.x86_64

 

2、导入仓库源

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

 

3、查看可安装的软件包

yum --enablerepo="elrepo-kernel" list --showduplicates | sort -r | grep kernel-ml.x86_64
kernel-ml.x86_64                         5.11.15-1.el7.elrepo          elrepo-kernel
kernel-ml.x86_64                         5.11.14-1.el7.elrepo          elrepo-kernel
kernel-ml.x86_64                         5.11.14-1.el7.elrepo          @elrepo-kernel

 

4、安装指定版本

yum --enablerepo="elrepo-kernel" install kernel-ml-5.11.14-1.el7.elrepo

注意：我这里用的是偶数版本，我还是信奉奇数作为研发版、偶数为稳定版。

 

5、启动指定版本

cat /boot/grub2/grub.cfg |grep menuentry
if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
  menuentry_id_option=""
export menuentry_id_option
menuentry 'CentOS Linux (5.11.14-1.el7.elrepo.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-5.11.14-1.el7.elrepo.x86_64-advanced-9f2d3e15-a78a-4f3d-8385-0165b4b67864' {
menuentry 'CentOS Linux (3.10.0-1127.19.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1127.19.1.el7.x86_64-advanced-9f2d3e15-a78a-4f3d-8385-0165b4b67864' {
menuentry 'CentOS Linux (3.10.0-1127.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1127.el7.x86_64-advanced-9f2d3e15-a78a-4f3d-8385-0165b4b67864' {
menuentry 'CentOS Linux (0-rescue-20200914151306980406746494236010) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-20200914151306980406746494236010-advanced-9f2d3e15-a78a-4f3d-8385-0165b4b67864' {

grub2-set-default 'CentOS Linux (5.11.14-1.el7.elrepo.x86_64) 7 (Core)'
grub2-editenv list
grub2-mkconfig -o /boot/grub2/grub.cfg
grubby --default-kernel

 

6、重启测试看下

reboot
uname -r
5.11.14-1.el7.elrepo.x86_64