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Sometimes you need just a bit bigger console window when you working with your CentOS virtual installation with only NAT network enabled and you are too lazy to mess with port forwarding on VirtualBox or your preferred Virtualization software. Just for few small short experiments.

So, in grub.conf you’ll find something like that (default install using NetInstall image):

title CentOS (2.6.18-238.19.1.el5)

  root (hd0,0)

  kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/VolGroup00/LogVol00

  initrd /initrd-2.6.18-238.19.1.el5.img

And you need to add next string to kernel:

console=ttyS0,57600 console=tty0 vga=792

So it would look like:

title CentOS (2.6.18-238.19.1.el5)

  root (hd0,0)

  kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/VolGroup00/LogVol00 console=ttyS0,57600 console=tty0 vga=792

  initrd /initrd-2.6.18-238.19.1.el5.img

Other values for vga parameter:

791 - 1024x768, 16 bit

792 - 1024x768, 24 bit

794 - 1280x1024, 16 bit

795 - 1280x1024, 24 bit

After reboot it should work.