kk Blog —— 通用基础


date [-d @int|str] [+%s|"+%F %T"]
netstat -ltunp
sar -n DEV 1

centos 设置默认启动内核

https://www.4spaces.org/centos7-change-kernel-order/

查看当前默认启动内核

1

grub2-editenv list

查看所有内核

1
2

cat /boot/grub2/grub.cfg | grep menuentry
menuentry 'CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-693.el7.x86_64-advanced-a5c5c2e2-9baf-46e5-9703-ee9d6b421f66' {

设置新的启动内核

1

grub2-set-default 'CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core)'