bootmenu读秒时按e，
linux16末尾加rd.break console=tty0，ctrl+x执行 mount -o remount,rw /sysroot/ #读写模式重新挂载/sysroot chroot /sysroot/ #change root to /sysroot passwd or ehco "passwd" >passwd --stdin root #set password to root touch /.autorelabel #selinux re marking exit exit
