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I am using Fedora 21 in Oracle Virtual Box. I am using just tty (no GUI). I need to increase screen resolution, I tried following things but failed:

xrandr but gives me error: cannot open display

I also tried typing video=1024x768 as kernel parameter but no success

also tried cvt 1024 768

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You have to install guest additions...

https://ask.fedoraproject.org/en/question/44503/fedora-20-virtualbox-guest-additions-install/

0

Edit /etc/default/grub as
:~$ sudo nano /etc/default/grub

add vga=795 to the line GRUB_CMDLINE_LINUX_DEFAULT, it might look like this:
GRUB_CMDLINE_LINUX_DEFAULT="splash vga=792"

then update grub
:~$ sudo update-grub

now reboot
:~$ sudo reboot -r now

This method worked for Fedora 21 and Debian 8 in Oracle virtualbox 5

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