Having trouble with my swap file
 

I am not sure what I am doing wrong, I am trying to create a swap file
512 megs in size, what I've done so far is:
#dd if=/dev/zero of=/swapfile2 bs=1024 count=524288
then i allocated an area to be swapped
#mkswap /swapfile2
I activated it and everything was fine
#swapon /swapfile2
i rebooted linux and added the entry to etc/fstab file
but when I try to open it with vi
#vi /etc/fstab ( I appended the following line, but it will not open)
i cannot verify if the swap has activated
I just get an error message saying invalid media type reading drive ,
what am I doing wrong?
Thanks ahead of time
-D

what am I doing wrong?
Not reading the man page for swapon, to put it bluntly.
sudo vi /etc/fstab will let you change the partitions that are mounted at boot, but won't tell you if the swap is on or off.

You should have added it to fstab BEFORE rebooting.

Add this to fstab:

then reboot.