Containers on Sébastien Han

Rook just landed on operatorhub.io

Fri, 17 May 2019 22:59:04 +0000

I’m excited to announce that just right for Cephalocon and KubeCon Europe, Rook has landed on operatorhub.io. It has been quite a challenge to have it merged, but in the end my pull request got merged :). If you want to know what this means for upstream you should look at this article.

Hey! What's up?!

Thu, 09 May 2019 19:52:55 +0000

It has been a long time since I’ve been giving updates or even blogging. Let’s take some time here (while being on the plane) to update you on what I’m doing these days.

Ceph nano is getting better and better

Sun, 24 Feb 2019 14:42:07 +0000

Long time no blog, I know, I know… Soon, I will do another blog entry to “explain” a little why I am not blogging as much I used too but if you’re still around and reading this then thank you! For the past few months, cn has grown in functionality so let’s explore what’s new and what’s coming.

Ceph Nano big updates

Mon, 30 Apr 2018 12:36:11 +0000

With its two latest versions (v1.3.0 and v1.4.0) Ceph Nano brought some nifty new functionalities that I’d like to highlight in the article.

Handling app signals in containers

Mon, 26 Mar 2018 23:22:51 +0000

A year ago, I was describing how we were debugging our ceph containers; today I’m back with yet another great thing we wrote :). Sometimes, when a process receives a signal and if that process runs within a container, you might want to do something before or after its termination. That’s what we are going to discuss.

Huge changes in ceph-container

Mon, 19 Mar 2018 00:19:07 +0000

A massive refactor done a week ago on ceph-container. And yes, I’m saying ceph-container, not ceph-docker anymore. We don’t have anything against Docker, we believe it’s excellent and we use it extensively. However, having the ceph-docker name does not reflect the content of the repository. Docker is only the Dockerfile, the rest is either entrypoints or examples. In the end, we believe ceph-container is a better match for the repository name.

Introducing ceph-nano

Tue, 28 Nov 2017 19:23:14 +0000

I’ve recently started a small project that aims to help developers working with the S3 API. The program is called cn for Ceph Nano, is available on github let me give you a tour of what it does. I initially presented the program during my talk at the last OpenStack summit in Sydney. Originally, I wrote a quick prototype in Bash, then moved to Go.

The new Ceph container demo is super dope!

Tue, 27 Jun 2017 16:41:53 +0000

I have been recently working on refactoring our Ceph container images. We used to have two separate images for daemon and demo. Recently, for Luminous, I decided to merge the demo container into daemon. It makes everything easier, code is in a single place, we only have a single image to test with the CI and users have a single image to play with.

Ceph Docker better support for Bluestore

Wed, 14 Jun 2017 11:16:04 +0000

I have been extensively working on ceph-docker for the last few months and it’s getting better. With the upcoming arrival of Ceph Luminous (next LTS), Bluestore will be the default backend to store objects. Thus, I had to spend some time working on improving the support for Bluestore.

Disabling scenarios in ceph-docker

Mon, 17 Apr 2017 10:35:34 +0000

I recently completed a full resync from Kraken to Jewel in ceph-docker in which I introduced a new feature to disable scenarios. Running an application on bleeding edge technology can be tough and challenging for individuals and also for companies. Even me, as a developer and for bleeding edge testers I’m tempted to release unstable features (understand not recommended for production). So sometimes it’s handy to have the ability to restrict the use of a software by disabling some of its functionality. This is exactly what I did for ceph-docker, in this article I’ll explain how that works.

Test Ceph Luminous pre-release with ceph-docker

Thu, 13 Apr 2017 11:55:17 +0000

*/!\ DISCLAIMER /!*

*/!\ DO NOT GET TOO EXCITED, AT THE TIME OF THE WRITTING LUMINOUS IS NOT OFFICIALLY RELEASE IN STABLE YET /!*

*/!\ USE AT YOUR OWN RISK, DO NOT PUT PRODUCTION DATA ON THIS /!*

Luminous is just around the corner but we have been having packages available for a couple of weeks already. That’s why I recently thought: “how come don’t we have any Ceph container image for Luminous then?”. And I know a lot of you are eager to test the latest developments of Bluestore (the new method to store objects, directly on a raw device).

Now it’s done, you can fetch the ceph/daemon image using one of these two tags:

tag-build-master-luminous-centos-7
tag-build-master-luminous-ubuntu-16.04

And you will get a running Ceph cluster on Luminous.

Debug Ceph Docker containers

Mon, 27 Mar 2017 17:00:49 +0000

For the last couple of weeks, Erwan Velu and I have been busy refactoring the entire ceph-docker code base. Through these cosmetic changes, we implemented new mechanisms to finely grained debug containers at run time. This article was co-written with Erwan Velu and will explain what we worked on.

No more privileged containers for Ceph OSDs

Mon, 20 Feb 2017 15:45:50 +0000

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.

Ceph zap device container

Mon, 25 Jul 2016 11:24:43 +0000

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.

Ceph RBD mirror daemon available in containers

Thu, 21 Jul 2016 10:39:15 +0000

I recently pushed into ceph-docker the support for thr RBD mirror. This daemon is responsable for asynchronously replicating RBD images from one cluster to another. The main purpose of the daemon is to address disaster recovery use cases.

Busy working on ceph-docker :)

Mon, 06 Jun 2016 20:10:38 +0000

I have been having a hard time keeping up with all things happening at the office and the blog. One of the main reason is that I actively resumed my work on ceph-docker, in this article I will explain some of the things I have been working on.

Ceph cluster on Docker for testing

Mon, 24 Aug 2015 15:22:00 +0000

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 :).

Getting started with the Docker RBD volume plugin

Mon, 17 Aug 2015 16:52:00 +0000

Docker 1.8 was just released a week ago and with it came the support for volume plugin. Several volume plugins are available but today I will be introducing the Ceph RBD ones (yes there are currently 3 different drivers).

Build Kubernetes from source

Wed, 01 Jul 2015 16:27:00 +0000

It is crucial to know how to build Kubernetes from source if you want to implement new features.

Bring persistent storage for your containers with KRBD on Kubernetes

Mon, 29 Jun 2015 00:24:00 +0000

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.

Map a RBD device inside a Docker container

Fri, 26 Jun 2015 16:11:00 +0000

People have been having trouble to map a RBD device in a container. Quick tip on how to map a Rados Block Device into a container.

Bootstrap your Ceph cluster in Docker

Tue, 23 Jun 2015 00:17:00 +0000

Almost two years have passed since my first attempt to run Ceph inside Docker. Time has elapsed and I haven’t really got the time to resume this work until recently. For the last couple of months, I have been devoting a third part of my time to contributing on deploying Ceph in Docker. Before we start, I would like to highlight that nothing of this work would have been possible without the help of Seán C. McCord. Indeed the current ceph-docker repository is based on Seán’s initial work. Let’s see how you can get this running!

Deploy Ceph monitors on Kubernetes

Thu, 18 Jun 2015 14:56:00 +0000

As part of my work on ceph-docker, I have been playing a bit with Kubernetes. As a first exercise, I thought it would be interesting to run my Ceph monitors with Kubernetes. Let’s see how we can achieve that.

Crash course: next generation servers with containers

Mon, 03 Feb 2014 14:40:00 +0000

For more than a year, containers have become more and more popular especially thanks to rise of Docker. Unfortunately the concept itself is not always clear for everyone. It is important to understand the difference between LXC and Docker. In this article, I will expose the different technologies available.

Access a Docker container without ssh

Mon, 27 Jan 2014 00:01:00 +0000

Quick tip to access a container without SSH.

Docker at Spotify

Fri, 10 Jan 2014 09:58:00 +0000

Nice talk from Rohan Singh about the internal usage of Docker at Spotify.

How I barely got my first Ceph monitor running in Docker

Thu, 19 Sep 2013 22:37:00 +0000

Docker is definitely the new trend. Thus I quickly wanted to try to put a Ceph monitor inside a Docker container. Story of a tough journey…

First glimpse at CoreOS

Tue, 03 Sep 2013 00:10:00 +0000

CoreOS is an emergent project that aims to address one of the most pressing questions in the server’s world. We at eNovance, therefore released eDeploy: a tool that performs bare metal deployment and manages upgrades with ease. Deploying and upgrading servers are currently two major concerns in the IT world since none (or at least very few people know how to do). I couldn’t resist trying CoreOS.

Introduction à Juju avec LXC

Tue, 07 Feb 2012 17:14:00 +0000

Juju fait parti des nouveaux outils développés par Ubuntu dans sa gamme Ubuntu Cloud pour déployer votre infrastructure Cloud privé. Il fait parti intégrante du projet Orchestra. Actuellement Juju est en cours de développement. Il est toutefois possible de réaliser des tests soit avec des instances Amazon EC2 soit en local avec des LXC. Pour ma part j’ai testé cela à partir de conteneur LXC.