Running an etcd-Backed Docker Swarm Cluster
In this post, I’ll build on a couple of previous posts and show you how to build your own Docker Swarm cluster that leverages etcd for cluster node discovery. This post builds on the information presented on how to run an etcd 2.0 cluster on Ubuntu as well as the information found in this post on running a Consul-backed Docker Swarm cluster.
To help you follow along, I’ve created a Vagrant environment that you can use to turn up the configuration described in this blog post. These files are found in the “docker-swarm-etcd” directory of my GitHub learning-tools repository. Feel free to use the files in this directory/repository to help with the learning process.
There are 3 major components to this configuration:
- A cluster of three Ubuntu 14.04 systems running etcd 2.0 (specifically, etcd 2.0.9, the last release as of this writing). This etcd cluster serves as a discovery back-end for Docker Swarm.
- A set of hosts running the Docker daemon (version 1.4.0 or higher, as required by Swarm). In this particular instance, I’m using CoreOS Linux (version 557.2.0 from the stable branch).
- A few containers running on the CoreOS hosts; Continue reading
Docker 1.6: Engine & Orchestration Updates, Registry 2.0, & Windows Client Preview
We are happy to announce updates to Docker Engine, Registry, Compose, Swarm, and Machine. We are releasing them all at the same time so you can test and roll them out together, and so that we can ship features that … ContinuedFaster and Better Image Distribution with Registry 2.0 and Engine 1.6
There has been incredible growth in the usage of Docker Hub: we have now served over 300 million pulls to developers around the world, and will soon be serving 100 million per month. The current generation of the Registry has … ContinuedEasily Configure Apps for Multiple Environments with Compose 1.2 and Much More
Today we’re very happy to announce the second release of Docker Compose, a tool for easily defining and running multi-container apps. Head straight to the install docs if you can’t wait to download and use it. Since we announced … ContinuedHighlights from the Docker Project’s first open-source-a-thon
Today we are nearing the end of the Docker Open-Source-a-Thon that kicked off with the Docker birthday party! Here’s an update about the fun times we’ve had so far. We have had over 20 fantastic events across the world, with … ContinuedRunning an etcd 2.0 Cluster on Ubuntu 14.04
In this post, I’m going to show you how to set up a cluster of three nodes running etcd 2.0 (specifically, etcd 2.0.9). While I’ve discussed etcd before, that was in the context of using etcd with CoreOS Linux. In this case, I’ll use Ubuntu 14.04 as the base OS, along with the latest released version of etcd.
To help you follow along, I’ve created a set of files that will allow you to use Vagrant to turn up an etcd 2.0 cluster on Ubuntu 14.04 (on your laptop, if so desired). You can find all these files in the “etcd-2.0” directory of my learning-tools GitHub repository.
Installing the Base OS
You don’t need anything special when setting up etcd; a straightforward Ubuntu Server 14.04 x64 installation will work just fine. If you’re using the files in my learning-tools repository, you’ll see that Vagrant simply turns up a VM based on a plain-jane Ubuntu 14.04 box. If you’re building this from scratch (why?!), simply create a VM and install Ubuntu 14.04 into it. As long as it has Internet connectivity, that’s all that’s needed.
Installing etcd
Installing etcd Continue reading
Docker Tutorial 5 – Basic Networking
This is a casual Docker tutorial series. We started out first with very simple sessions on how to install and use the docker run command. In future videos we will hit more advanced topics. This fifth video talks about … ContinuedDocker Announces $95m Series D Funding Round
This morning, we announced a $95M Series D funding round that will help ensure that Docker can deliver on an ambitious set of long term priorities. More importantly, we believe that it will enable us to deliver on product, support, … ContinuedAnsible at PyCon – Achieving Continuous Delivery: An Automation Story (Video)
James Cammarata spoke at PyCon 2015 this past week and presented his talk, Achieving Continuous Delivery: An Automation Story.
And his slides:
Docker Tutorial 4 – More Run With a Couple of Extra Goodies
This is a casual Docker tutorial series. We started out first with very simple sessions on how to install Docker, the docker run command and had fun with volumes. In future videos we will hit more advanced topics. In this fourth video … ContinuedDetecting empty files in awk
It's not straightforward, but it can be done.Cisco VIRL Exclude From Launch
One of the few pet-peeves with Cisco’s VIRL has been waiting for a bunch of things to start, when I just needed a couple from that simulation. Not sure if this is a new update though it’s...[[ Summary content only, you can read everything now, just visit the site for full story ]]
The Plain Text Productivity Experiment
I’m a big fan of plain text-based formats and tools, for a variety of reasons. As a result, I’ve moved almost all of my writing into plain text formats, primarily Markdown (MultiMarkdown, to be specific), and I recently spent a couple of months experimenting to see if a plain text-based productivity system would work for me as well. Here’s what I found.
<aside>I won’t go into a great amount of detail on why I wanted to see if a plain text-based productivity system would work, as I’ve discussed the merits of using plain text-based formats before (platform portability, application portability, longevity, etc.).</aside>
I first looked at Gina Trapani’s todo.txt system, which is plain text-based and has a thriving community built around its format. The todo.txt format is very straightforward and very simple—almost too simple. After trying it for a short while I found that it just wasn’t flexible enough to meet my needs.
A few weeks later, I stumbled on the TaskPaper format (named after the Mac app of the same name). Also plain text-based, the TaskPaper format also had a thriving community of applications and tools built around the format, and while also Continue reading
DockerCon CFP Summary
Our DockerCon 2015 call for papers closed last week, and we’d like to sincerely thank the 338 individuals who submitted talks. These submissions are further proof of a bright, witty and extremely talented community that surrounds Docker. We are very … ContinuedYour Docker agenda in April
March has been an incredibly busy month for the Docker Community with all of the birthday celebrations and open-source-a-thons, and it’s not over yet. You have until April 19th to make a contribution that counts toward Docker’s donation to the … ContinuedAnsible and Containers: Why and How
Everyone loves the promise of containers.
More specifically: everyone loves the promise of a world where they can build an application on their laptop, and have that application run exactly the same way in every environment -- from their laptop all the way to production, and at every step in between.
That's still a holy grail, though. In the meantime, people seem to be looking for practical ways to get all of the advantages of containers -- consistency, lightweight environments, application segregation, and so on -- while still maintaining the flexibility required to work with the many environments that are not amenable to containerization.
Which may explain why so many people... wow, just a lot of people... seem to be talking about Ansible and containers together:
So why are people using Ansible with Docker and other container formats? A few reasons:
* Ansible playbooks are portable. If you build a container with a pure Dockerfile, it means that the only way you can reproduce that application is in a Docker container. If you build a container with an Ansible playbook, you can then reproduce a very similar environment in Vagrant, or in a cloud instance of your choice, Continue reading
Announcing Webhook Respository Subscriptions
Back in December at DockerCon Europe, we announced chained Webhooks. This enabled you to configure your deployment processes to continue only if the previous Webhook completed successfully. Today we are excited to announce expanded Webhook capabilities. You can now set … ContinuedThree new Official Images added in March
We’re excited to announce three new Official Images that we added to Docker Hub in March. These images are part of Docker’s mission to add robust, enterprise-ready development technologies to the Docker ecosystem. Check them out: Alpine Alpine Linux is a … ContinuedDocker Tutorial 3 – Fun With Volumes
This is a casual Docker tutorial series. We started out first with very simple sessions on how to install Docker and use the docker run command. In future videos we will hit more advanced topics. This third video talks … ContinuedAnsibleFest NYC TIckets Now on Sale
We are excited to announce the date for AnsibleFest NYC 2015
When: June 4th
Where: Conrad Hotel NYC - 102 North End Ave, New York, NY 10282
AnsibleFest is a day-long conference bringing together Ansible users, developers and industry partners to share best-practices, case studies and Ansible news. If you are a developer, sysadmin, operations director or devops practioner, AnsibleFest is for you.
Past speakers have included Twitter, Google, Rackspace, EdX, HP, Twilio, Cumulus Networks, Telescope.tv and many more - as well as members of the Ansible Team.
SPECIAL OFFER: Buy an Ansible Tower Starter Kit and get 4 free tickets. Simply enter the promo code festnyc at checkout. BUY NOW
If you are interested in speaking, please contact [email protected]
If you are interested in sponsoring, please email [email protected] for details
Be sure to follow us on Twitter to stay informed of all of the AnsibleFest news. We'll be announcing some special surprises in the weeks leading up to the event.
