载入公钥
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
安装 ELRepo 最新版本
yum install -y https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
列出可以使用的 kernel 包版本
yum list available --disablerepo=* --enablerepo=elrepo-kernel
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
elrepo-kernel: mirrors.tuna.tsinghua.edu.cn
elrepo-kernel | 3.0 kB 00:00:00
elrepo-kernel/primary_db | 2.0 MB 00:00:00
Available Packages
kernel-lt.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 5.4.162-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
perf.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.15.5-1.el7.elrepo elrepo-kernel
安装指定的 kernel 版本：
yum install -y kernel-lt.x86_64 --enablerepo=elrepo-kernel
查看系统可用内核
cat /boot/grub2/grub.cfg | grep menuentry
menuentry 'CentOS Linux (3.10.0-1062.el7.x86_64) 7 (Core)' --class centos （略）
menuentry 'CentOS Linux (4.4.218-1.el7.elrepo.x86_64) 7 (Core)' --class centos ...（略）
menuentry 'CentOS Linux (5.4.162-1.el7.elrepo.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-3153fb87-fd2a-4cca-b938-8a2a97f7ffcd' {
menuentry 'CentOS Linux (3.10.0-1160.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentr_id_option 'gnulinux-3.10.0-1160.el7.x86_64-advanced-3153fb87-fd2a-4cca-b938-8a2a97f7ffcd' {
menuentry 'CentOS Linux (0-rescue-8703a975bb214778a37caadda8ee332d) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-8703a975bb214778a37caadda8ee332d-advanced-3153fb87-fd2a-4cca-b938-8a2a97f7ffcd' {
设置开机从新内核启动
grub2-set-default 'CentOS Linux (5.4.162-1.el7.elrepo.x86_64) 7 (Core)'
查看内核启动项
grub2-editenv list
saved_entry=CentOS Linux (5.4.162-1.el7.elrepo.x86_64) 7 (Core)
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