No more privileged containers for Ceph OSDs

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I’m really sorry for being so quiet lately, I know I promised to release articles more regularly and I clearly failed… Many things are going on and where motivation is key to write articles, I’ve been having a hard time to find the right motivation to write :/

However, I am not giving up and I finally found the time to write a little bit on the things we improved in ceph-docker, our Ceph in container project.

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Devstack Ceph supports containerized Ceph

Devstack Ceph supports containerized Ceph

Yes people, I’m still alive :). As you might noticed, I’ve been having a hard time to keep up the pace with blogging. It’s mainly due to me traveling a lot these days and preparing conferences. It’s a really busy end of the year for me :).

Fortunately, I’m still finding the time to work on some new features to projects I like. As you might know, I’ve been busy working on ceph-ansible and ceph-docker, trying conciliate both and making sure they work well together. In ceph-docker, we have an interesting container image, that I already presented here. I was recently thinking we could use it to simplify the Ceph bootstrapping process in DevStack. The patch I recently merge doesn’t get ride of the “old” way to bootstrap, the path is just a new addition, a new deployment method.

In practice, this doesn’t change anything for me, but at some point it allows us to validate that a containerized Ceph doesn’t have any problem and bring the same functionality as a non-containerized Ceph. Without further ado, let’s jump into this!

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Ceph zap device container

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Some use cases might require to zap a device (destroy partition tables) prior to run your Ceph OSD container with a dedicated disk. While running development environment this is particularly interesting as this allows us to quickly bootstrap and tear down sandboxes.

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Ceph cluster on Docker for testing

I haven’t advertised this one really much (even if I’ve been using it in some articles). Since people are still wondering how to quickly get a full Ceph cluster up and running for testing, I believe it deserves its own article so it will get more visibility. Re-introducing the Ceph demo container. This is going to be a really short article :).

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Bring persistent storage for your containers with KRBD on Kubernetes

Use RBD device to provide persistent storage to your containers. This work was initiated by a colleague of mine Huamin Chen. I would like to take the opportunity to thank him for the troubleshooting session we had. Having the ability to use persistent volume for your containers is critical, containers can be ephemeral since they are immutable. If they did on a machine they can be bootstrapped on another host without any problem. The only problem here is we need to ensure that somehow the data that come with this container will follow it no matter where it goes. This is exactly what we want to achieve with this implementation.

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