Centos7修改默認啟動內核

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

root@Cs7-sh-03:/root> 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 (3.10.0-693.2.2.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.21.1.el7.x86_64-advanced-58ebcc18-06a4-454a-a772-4f583085b996' {
menuentry 'CentOS Linux (3.10.0-514.21.1.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.21.1.el7.x86_64-advanced-58ebcc18-06a4-454a-a772-4f583085b996' {
menuentry 'CentOS Linux (3.10.0-514.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-514.el7.x86_64-advanced-58ebcc18-06a4-454a-a772-4f583085b996' {
menuentry 'CentOS Linux (0-rescue-8d13a50988cc5c4972347415eddf7d47) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-8d13a50988cc5c4972347415eddf7d47-advanced-58ebcc18-06a4-454a-a772-4f583085b996' { 

#查看當前內核

root@Cs7-sh-03:/root> uname -r 
3.10.0-514.21.1.el7.x86_64

#修改開機時默認使用的內核

grub2-set-default 'CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core)'

#查看內核修改結果

root@Cs7-sh-03:/root> grub2-editenv list 17-10-10 14:21
saved_entry=CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core)

#查看系統安裝了哪些內核包

root@Cs7-sh-03:/root> rpm -qa |grep kernel
kernel-3.10.0-514.el7.x86_64
kernel-3.10.0-514.21.1.el7.x86_64
kernel-debug-devel-3.10.0-693.2.2.el7.x86_64
abrt-addon-kerneloops-2.1.11-48.el7.centos.x86_64
kernel-tools-libs-3.10.0-693.2.2.el7.x86_64
kernel-tools-3.10.0-693.2.2.el7.x86_64
kernel-headers-3.10.0-693.2.2.el7.x86_64
kernel-3.10.0-693.2.2.el7.x86_64

#使用yum remove 或rpm -e 刪除無用內核

yum remove kernel-3.10.0-514.21.1.el7.x86_64

 

參考：http://www.cnblogs.com/niyeshiyoumo/p/6762193.html