Mike Coleman

Recently I was giving a talk at a trade show on the basics of Docker, and how an application goes from an idea to being a production workload running on a Universal Control Plane managed Swarm cluster. As part of that talk, I spent a bit of time talking about how containers are not VMs. This was especially relevant as most of the attendees currently worked as virtualization sysadmins. During the QA portion of the session one of the attendees asked me “When does my application go in a VM and when does it go in a container?”

Continue reading...
Mike Coleman

I have had a version of the following conversation more than a few times with community members trying to sort out where to run their containerized apps in production: User: So, where should I run my containers? Bare metal or VM’s Me: It’s not a question of “either / or” – that’s the beauty of Docker. That choice is based solely on what’s right for your application and business goals – physical or virtual, cloud or on premise. Mix and match as your application and business needs dictate (and change). User: But, surely you have a recommendation. Me: I’m going…

Continue reading...
Mike Coleman

In what appears to be a recurring theme (which I promise I’ll move off of soon), I’m going to spend some time talking about what Docker isn’t – Docker is not application virtualization. I spent a good amount of time at VMware where I worked on VMware View (which begat Horizon View which begat Horizon 7), so I’m more than a bit familiar with desktop and application virtualization. And, I understand why some people, when they first hear us talk about leveraging Docker for application portability they think along the lines of App-V, XenApp or ThinApp.

Continue reading...
Mike Coleman

A couple weeks back I talked about how Docker containers were not virtual machines (VMs). I received a lot of positive feedback on the article (thanks!), but I also heard a common question: Can VMs and Docker containers coexist? The answer is a resounding “yes.”

Continue reading...
Mike Coleman

I spend a good portion of my time at Docker talking to community members with varying degrees of familiarity with Docker and I sense a common theme: people’s natural response when first working with Docker is to try and frame it in terms of virtual machines. I can’t count the number of times I have heard Docker containers described as “lightweight VMs”. I get it because I did the exact same thing when I first started working with Docker. It’s easy to connect those dots as both technologies share some characteristics. Both are designed to provide an isolated environment in which…

Continue reading...
David Messina

Docker is pleased to have been included in Gartner’s latest “Cool Vendors in DevOps, 2015“report, published April 21. In the report, Gartner notes: “As virtualization and cloud applications grow beyond being single images run on premise to being comprised of multiple tiers that can be run and scaled in a hybrid cloud, new approaches are needed to reduce complexity.” Docker is focused on reducing the complexities of building, shipping and running distributed applications, whether deployed on prem or in the cloud. We blieve our inclusion in the report reflects the progress that we’ve made over the last year to develop the…

Continue reading...