We made those work first thing! 
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I almost always use Docker, one Dockerfile for testing, another for production, maybe yet another for pressure test.
There’s a GitLab server in my company, so I just installed gitlab-runner on a PC for doing CI tasks.
And I often use Docker swarm to deploy my app because I’m often restricted to some sort of closed environment that does not allow me to access public clouds. On a bunch of on-premises servers, docker swarm is an easier way to build a cluster, compared to K8s.
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Oh, I know! I saw that example and the app, just wanted to highlight that that is one of the most important things : )
I’m eager to try fly.io soon!
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