centos7 選定默認啓動內核，及刪除無用內核

時間 2019-12-06

標籤 centos7 centos 選定默認啓動內核刪除無用欄目 Tomcat 简体版

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centos7 選定默認啓動內核，及刪除無用內核

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#使用cat /boot/grub2/grub.cfg |grep menuentry 查看系統可用內核

[root@bigapp-slave27 ~]# 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 (3.10.0-514.16.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-327.el7.x86_64-advanced-6f5840d0-55ac-4d3b-899b-61c0297c5347' {

menuentry 'CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-327.el7.x86_64-advanced-6f5840d0-55ac-4d3b-899b-61c0297c5347' {

menuentry 'CentOS Linux (0-rescue-d57307c454c0437d91c309347178cdf5) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-d57307c454c0437d91c309347178cdf5-advanced-6f5840d0-55ac-4d3b-899b-61c0297c5347' {

#查看當前內核

[root@bigapp-slave27 ~]# uname -r

3.10.0-514.16.1.el7.x86_64

#修改開機時默認使用的內核

grub2-set-default 'CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)'

#查看內核修改結果

[root@bigapp-slave27 ~]# grub2-editenv list

saved_entry=CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)

#查看系統安裝了哪些內核包

[root@bigapp-slave27 ~]# rpm -qa |grep kernel

kernel-3.10.0-327.el7.x86_64

kernel-headers-3.10.0-514.6.1.el7.x86_64