018.CentOS升级内核

  1 [root@localhost ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
  2 [root@localhost ~]# rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm
  3 

  1 [root@localhost ~]# uname -a
  2 Linux localhost 3.10.0-862.11.6.el7.x86_64 #1
  3 

  1 [root@localhost ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

  1 [root@localhost ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" install -y kernel-ml-5.4.1-1.el7.elrepo

  1 [root@localhost ~]# vi /etc/default/grub
  2 ……
  3 GRUB_DEFAULT=0				#默认为第一项
  4 ……
  5 [root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg

  1 [root@localhost ~]# sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg	#查看所有内核
  2 [root@localhost ~]# sudo grub2-set-default 0							#设置开机采用最新内核

  1 [root@localhost ~]# reboot

  1 [root@localhost ~]# uname -a
  2 Linux localhost 5.4.1-1.el7.elrepo.x86_64