Docker containers are meant to be immutable, meaning the code and data they hold never change. Immutability is useful when you want to be sure the code running in production is the same as the code ...

Sometimes, you only need one container, because all you need is one instance of an app. But sometimes you need cluster of containers that can respond to changes in demand, and that can be upgraded ...

Devin Rich is a systems administrator in the finance industry. He spends his time focusing on automation, security and networking. Many system administrators have heard about Docker but don’t know ...