Best way to disable swap in Linux

Identify configured swap devices and files with 
cat /proc/swaps.
Turn off all swap devices and files with 
swapoff -a.
Remove any matching reference found in 
/etc/fstab.
Optional: Destroy any swap devices or files found in step 1 to prevent their reuse. Due to your concerns about leaking sensitive information, you may wish to consider performing some sort of secure wipe.