My one primary issue right now with Docker is that it's a little difficult to get something like Apache going, since it's a service. Docker obviously detects the command I pass in as finished, and then stops the container.

Here it's solved by turning the nginx daemon off and running the command directly, but is there a better way to run something like Apache (which runs as a service) to host PHP applications, without resorting to sending long running commands like "while true; sleep 1; done"?

I guess this kind of defeats the purpose of Docker, in a sense, since the project's more about isolating applications (which generally run as a long running process, a la Node.js). But, PHP is still a popular platform for development and I'd love to be able to try out Docker for some of my own PHP stuff versus spinning up entire VMs with Vagrant.