I rented my first VPS 15 years ago and it was cheap. IIRC the VPS software was called Virtuozzo. Since I was using Java at work, it seemed a good idea to instal

I rented my first VPS 15 years ago and it was cheap. IIRC the VPS software was called Virtuozzo. Since I was using Java at work, it seemed a good idea to install a Java CMS: https://pebble.sourceforge.net/ https://pebble.sourceforge.net/ But it was not so easy. Java refused to start with an out-of-memory error. It took me many hours to find out that the VPS had assigned very little memory at start. It was possible for the JVM to expand once running, but the initial request had to be small enough to avoid the error and not so small as to prevent Pebble from running. Once this problem was fixed and iptables set, everything was fine. I even setup postmail. But the experience taught me that a VPS has different rules. I wouldn't trust the measurements in the article. They could depend on the load that other VPS in the same machine are supporting at the same time.