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The biggest feature I'm missing in docker-compose is the ability to do zero downtime deployment (spawning a new container for a service while maintaining the old one up until the new one is ready would be enough).

Does Kontena allow this?

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Yes it does. Additionally if your service has more than 1 instance then Kontena will replace each instance one-by-one when deploying. You can even define that Kontena will wait for given port before moving to next instance.

Oh wow, that's awesome. I'm sold :)

Thanks!

Edit: btw, you should probably advertise this more on the home page, I'm pretty sure zero downtime is a big no go for many when it comes to docker-compose, especially rails users used to it with unicorn.

That's true. There are still lot's of hidden features that we should mention somewhere. We are currently improving our documentation, so hopefully things are better soon.

And thanks for feedback, it is always appreciated and motivating us to make it better!

You might find dokku or dokku-alt interesting.

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