天行健,君子以自强不息;地势坤,君子以厚德载物;

CentOS 7 升级内核及修改默认启动内核

CentOS 7 的内核升级及修改默认启动的内核,操作备档

http://elrepo.org/tiki/HomePage

导入公钥:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

 

To install ELRepo for RHEL-9:

yum install https://www.elrepo.org/elrepo-release-9.el9.elrepo.noarch.rpm

To install ELRepo for RHEL-8:

yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm

To install ELRepo for RHEL-7, SL-7 or CentOS-7:

yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm

 

查看内核:

yum --disablerepo=* --enablerepo=elrepo-kernel list kernel*

安装内核:

yum --disablerepo=\* --enablerepo=elrepo-kernel install kernel-ml.x86_64

 

查看GRUB缺省启动顺序

# cat /etc/default/grub | grep GRUB_DEFAULT
GRUB_DEFAULT=saved

如果是saved,就是按照指定保存的内核启动,如果为数字(0/1/2等),就是/boot/grub2/grub.cfg中对应位置的内核,建议设置为saved。

查看当前使用的内核:

# grub2-editenv list

saved_entry=CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core) with debugging

查看可以使用的内核:

# cat /boot/grub2/grub.cfg | grep 'menuentry '

menuentry 'CentOS Linux (5.18.1-1.el7.elrepo.x86_64) 7 (Core) with debugging' --class rhel fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.el7.x86_64-advanced-a1003f9f-2f89-4a7d-baea-d7e2d6b5088a' {
menuentry 'CentOS Linux (5.18.1-1.el7.elrepo.x86_64) 7 (Core)' --class rhel fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.el7.x86_64-advanced-a1003f9f-2f89-4a7d-baea-d7e2d6b5088a' {
menuentry 'CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core) with debugging' --class rhel fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.el7.x86_64-advanced-a1003f9f-2f89-4a7d-baea-d7e2d6b5088a' {
menuentry 'CentOS Linux (3.10.0-957.21.3.el7.x86_64) 7 (Core)' --class rhel fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.el7.x86_64-advanced-a1003f9f-2f89-4a7d-baea-d7e2d6b5088a' {

设置默认启动的内核:

# grub2-set-default 'CentOS Linux (5.18.1-1.el7.elrepo.x86_64) 7 (Core) with debugging'

查看设置后的结果:

# grub2-editenv list
saved_entry=CentOS Linux (5.18.1-1.el7.elrepo.x86_64) 7 (Core)

重启生效。

点赞

发表评论