Install CentOS 7 without VGA

Change timeout

• vim isolinux/isolinux.cfg

  default vesamenu.c32
  #timeout 600
  timeout 50
  
  display boot.msg

• Prompt until booting automatically, in units of 1/10 s. In the case, we change the timeout value from 60 secs to 5 secs

Change default booting prompt

...
label linux
  menu label ^Install Red Hat Enterprise Linux 7.3
  menu default
  kernel vmlinuz
  append initrd=initrd.img inst.stage2=hd:LABEL=RHEL-7_3\x20SE text console=tty0 console=ttyS0,115200n8
...

• Please notice menu default

Remove quiet, append text console=tty0 console=ttyS0,115200n8 in kernel parameter

• vim isolinux/isolinux.cfg

  ...
  
  label linux
    menu label ^Install CentOS Linux 7
    menu default
    kernel vmlinuz
    append initrd=initrd.img inst.stage2=hd:LABEL=CENTOS\x207\x20X8 text console=tty0 console=ttyS0,115200n8
  
  ...