June Jung 
CircleCI and Docker: What you need to know
CircleCI 2.0 implemented build support using Docker executors. Upon releasing it, we quickly realized that one of the biggest barriers that CircleCI users encountered was a lack of experience with Docker. In this post, we will discuss Docker and some of the basic commands users should become familiar with.
What is Docker
Here is a simplified definition of Docker:
“Docker is a platform for developers and sysadmins to develop, deploy, and run applications using containers.”
Docker is also referred to as an application packaging tool that enables applications to be configured and packaged into a Docker image that can be used to spawn Docker containers that run instances of the application. It provides many benefits including runtime environment isolation, consistency via code, and portability. Docker containers can run on any operating system that supports the Docker Engine. To our benefit, most operating systems do support it.
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We recently sat down with Jez Humble, Founder and CTO at DevOps Research and Assessment, DevOps thought leader, and author of some of the foundational books on delivering software at scale. Jez and his co-authors Nicole Forsgren and Gene Kim just recently published their latest book, 
Today we’re proud to announce the opening of our Boston office, our second US presence outside of our headquarters in San Francisco. While we’ve been a distributed company since the very beginning and had many team members all across the world, putting down roots on the East Coast marks an important moment in our growth, and we couldn’t be happier to be joining Boston’s thriving technology community.