Showing posts with tag docker. Show all posts
Showing posts with tag docker. Show all posts

    Running Kubernetes cluster with docker-compose for fun (and profit)

    This could've been called "Learning Kubernetes the hard way", because that's basically what I was trying to achieve here. It wasn't so much about learning how to use Kubernetes via its ingenious API as it was about learning about its individual components. If you want to just run Kubernetes locally, there's Minikube, that will give you nice VM with everything already set up.

    What I've wanted to achieve is to have a set of components, all nicely isolated with a well defined connection between each other so I can add them, remove them and break the connections and see how this affects the cluster. To put it simply I was interested in Ops side of running Kubernetes. This is why I took Hyperkube and mixed it with docker-compose and tried to stand up Kubernetes "from scratch".

    Let's get started..

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    Rebuilding NAS with ZFS & Docker

    It all started with tripped breaker. In fact it tripped multiple times before I got home. Luckilly the spinning rust drives with data survived that without any issues, but the flash drive didn't. So with system FUBAR and some (little) time on my hands, there's only one thing to do - upgrade.

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    Docker on ZFS

    Introduction

    So I've ended with this ZFS and Docker combination on my home storage some time ago. I use ZFS on Linux to safely store data and I use Docker to run services like samba, plex, owncloud, and others on top of that data.

    I've been using devicemapper on top of ZFS and it was mostly good. Every now and then I had this strange issue of layer not being available while starting container, (as if docker tried to spin up the container before having the storage ready for it) just re-running the container solved the issue. I've never seen this at work, where we use Docker in production quite a lot and in my case it was transparently handled by upstart so I've just assumed the combination of devicemapper and ZFS caused these. Besides that I was quite happy with the whole system.

    Recently I was wondering if there was some progress on the ZFS storage backend and I was pleasantly surpriset, that this is actually built in sice couple versions ago. (how did I miss that, I have no idea) So let's try it?

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    2016-03-04 00:00 Miroslav Prasil ,