First time I reached the front page I had ~250 concurrent users and increasing, then the server crashed. After that I wrote a cronjob that runs a script which

First time I reached the front page I had ~250 concurrent users and increasing, then the server crashed. After that I wrote a cronjob that runs a script which automatically increases my virtual machines RAM. When I have little or no visits it uses 1GB RAM the most it went up to was 9GB RAM (increasing with 1GB at a time). It also sends me an e-mail when increasing/decreasing the RAM so I can ensure that it doesn't crash. I also use Wordpress with caching enabled and the above helps me keep the costs down, don't want the server to run on 8GB RAM all the time nor 1GB RAM.