I have been playing with Dokku lately. I ran into some problems with the Dockerfile mode (creates tags like myapp:latest but then tries to start dokku/myapp:latest) and the CLI not parsing arguments correctly (had to put extra " chars in strange places). Perhaps the Procfile mode is more polished. Would like to know if there are any alternative single-host PaaSes out there to use for side projects.
Did you create github issues for these? Dokku is an active project that gets a lot of attention. IMO this is currently the best solution for small scale projects.
+1 As one of the dokku maintainers, I would love to see any random issues fixed. Feel more than free to open an issue on our tracker[1] and I'll be sure to comment.
FWIW space processing in command line args is a bit... difficult given our mode of transport (ssh). This is something we're thinking about fixing somehow, though there isn't a great solution yet.