> Question what benefits do you get with docker than without? Without I have Cgroups, my software is versioned i.e.: programm-X.X.X.jar / programm-X.X.X.rpm / w

> Question what benefits do you get with docker than without? Without I have Cgroups, my software is versioned i.e.: programm-X.X.X.jar / programm-X.X.X.rpm / whatever. Why do you get better / higher resource usage I mean you use an additional layer you could do the same with just CGroups. How do you do service discovery? Etcd could be installed without docker?! How do you auto-scaling without a cloud? I mean even without docker auto-scaling is trivial. Not to be dismissive, but why would we want to use cgroups? Docker works great for us. There are indeed tons of alternatives to everything. Why cgroups? Why not BSD and jails? Why not build on unikernels and VM images? > Why do you get better / higher resource usage I mean you use an additional layer you could do the same with just CGroups. Kubernetes (and most other Docker orchestration systems) come with a scheduler. Containers are allocated based on desired characteristics to the machines with the most spare capacity. You can cut down on idle capacity by intelligently spreading the load without having to think very much about it. You could do the same with cgroups, but you're going to need to write an orchestration system, a scheduler, and you probably won't have the massive communities that some of the alternatives have already built. > How do you do service discovery? Etcd could be installed without docker?! Yes, it can be installed without Docker if you'd like. We run some things in Docker, and others outside ourselves. It's no silver bullet. > How do you auto-scaling without a cloud? I mean even without docker auto-scaling is trivial. Docker is just one piece of the puzzle, which is something you seem to be missing. In our case, Kubernetes brings it all together into an easy-to-use package. Life is full of few absolutes. It's great if your cgroup deploy is working for you, it's just not a great fit for everyone. The comparison between Docker and cgroups is a bit apples to oranges, too. In reality, you need to compare a lot more than just the tech, the Docker ecosystem is the biggest appeal to us.