The requirements say that you need 4gb ram and I think 2 cpu cores.
However, mine is running on digital ocean and got 512 mb ram instance.
I created a 5 gb swap file and enabled it (ssd). A 3.5 -4gb swap should be all you really need.
sudo sysctl vm.swappiness=10
It takes a little longer to install, but my pool seems to be working fine and is quite responsive. I’d have to look at memory and cpu usage more to determine if the physical ram is really necessary.
Alas, even with 4-5k sols/s no blocks found. 
This stratum setup would be awesome for Ethereum solo mining, so I may add that feature.
A little heads up is that it initially took me a good day to figure out this guide. Even as someone who has setup lamp, pxe and many other linux servers in the past. Megacrypto did an amazing job, regardless.