Docker Clustering Tools Compared: Kubernetes vs. Docker Swarm

Re:Docker Clustering Tools Compared: Kubernetes vs. Docker S... by AndrewHampton on Wednesday November 04, 2015 @09:55AM (#10506952)

At my company, we've set up our own Kubernetes cluster and moved our production applications over to it over the past couple months. While I definitely agree, there is a steep learning curve for getting Kubernetes set up and configured, there are several factually inaccurate things in this article.

> With Docker we were supposed not to have installation instructions (aside from a few docker run arguments). We were supposed to run containers. Swarm fulfils that promise and Kubernetes doesn’t.

We run Kubernetes on CoreOS and every piece runs in a container. On the master, the api-server, controller and scheduler all run in docker containers. On the minions, the proxy and kubelet both run in containers.

> Another thing I dislike about Kubernetes is its need to know things in advance, before the setup. You need to tell it the addresses of all your nodes, which role each of them has, how many minions there are in the cluster and so on.

The master does not need to know the these things. Minions do need to know the address of the master, but they can self-register with master and join the cluster anytime.

With that being said, it did take two of our senior devs over a week to get a cluster we were happy with. I'm a fan of docker compose, and hope swarm becomes a good competitor to Kubernetes. I don't think it's there yet though.

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Re:Docker Clustering Tools Compared: Kubernetes vs. Docker S... by shlant on Wednesday November 04, 2015 @10:26AM (#10507182)

> We run Kubernetes on CoreOS and every piece runs in a container. On the master, the api-server, controller and scheduler all run in docker containers. On the minions, the proxy and kubelet both run in containers.

I don't think the direct complaint was that Kubernetes didn't "run in containers" but that it isn't as easy to set up as "just running some containers".

"With Docker we were supposed not to have installation instructions (aside from a few docker run arguments)". He was saying that the Kubernetes setup didn't fit the ease of setup touted by Docker.

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Re:Docker Clustering Tools Compared: Kubernetes vs. Docker S... by hosh on Wednesday November 04, 2015 @11:41AM (#10507737)

It's a fair point -- Kubernetes is a pain to install.

But I think the author then translated that to mean that Kubernetes is also difficult to use. It's much easier to use than it is to install.

On the flip side, when I had started seriously using Docker, I quickly ran into it's limitations. Docker is easy to use... as long as you stayed within the playground. When I started using Docker Compose seriously, I quickly ran into problems it couldn't handle. This was about 12 months ago. I think the current networking and docker swarm expanded that playground ... but it doesn't bridge the gap into getting this out as reliable and resilient infrastructure.

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Re:Docker Clustering Tools Compared: Kubernetes vs. Docker S... by serverholic on Wednesday November 04, 2015 @11:57AM (#10507868)

I have a feeling Docker will get there eventually. It seems they are moving slower because are being very careful and deliberate with what they introduce.

Docker seems to go for solutions that are general and flexible whereas kubernetes is very opinionated.

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Re:Docker Clustering Tools Compared: Kubernetes vs. Docker S... by hosh on Wednesday November 04, 2015 @05:28PM (#10510264)

I agree that Docker is careful about where they are going.

I'm not so sure that Kubernetes is being opinionated. They sit higher in the stack, and yet, it is built as a collection of building blocks.

Chances are, what Docker Swarm will turn into is reinventing Kubernetes.

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