I have an Ubuntu server running PostgreSQL and a very light weight custom web-server.
I knew this would happen but I was too busy, and now the disk has 0 bytes free. I don't need all the data in the database and I've already deleted lots of rows in some tables, but the space won't be freed until the database is "vacuumed", and to do the vacuum I need lots of free disk space.
What can I do? This is an Amazon EC2 instance.