Interview Q&A / Docker & Kubernetes

1. What is the difference between a Docker image and a container?

   An image is a read-only template that holds your app, its dependencies and a startup command. A container is a running (or stopped) instance of that image, with its own thin writable layer on top. One image can start many containers.

   BeginnerIn-depth3 min read
2. What happens when you run docker run nginx and the image is not on your machine?

   Docker looks locally, does not find nginx:latest, pulls it from Docker Hub, then creates and starts the container. With no tag given it uses latest, which is just a default tag name, not a guarantee of the newest version.

   BeginnerQuick answer1 min read