Moving Static Sites from Apache to nginx

My more complex Web sites run atop WordPress on Apache and MySQL. Every so often, Apache devours all available memory and the server becomes very very slow. I must log in, kill Apache, and restart it. The more moving parts something has, the harder it is to debug. Apache, with all its modules, has a lot of moving parts.

After six months of intermittent debugging, I decided that with the new hardware I would switch Web server software, and settled on nginx. I'd like to switch to Postgres as...