Motivation

• Can containers run inside other containers?
  YES!
• Is there a use case for such a case?
  Well, one famous one is the ability to run Kubernetes cluster in a single machine, using containers.
  This is what the minikube software is doing
• If you run jenkins inside containers,

  it may be usefullAS well.

• In …

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Containers Basics

• containers basics 1

• containers basics 2

Using containers

• docker in docker

Containers Networking

• containers networking

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Container Networking Basics

(based on the introduction here)

• Containers have networking enabled by default, and they can make outgoing connections.
• A container has no information about what kind of network it's attached to, or whether their peers are also Docker workloads or not.
• A container only sees a network …

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Why do we need containers? (a practical example)

• Let's say you are a developer, and is writing a Java program.
  • You need JDK, because this is where your Java compiler is.
  • You need Java Runtimn, because it will run the bytecode that your compiler will create.
  • You may need to run all of this on top of the specific …

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...it was working on my machine...

• When we are creating a program, we solve problems until we see it working on our development workstation.
• When deploying it to other machines (servers), things may fail, because some things are different there.
  What could be the difference?

Address Space separation

• A program …

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When your containers exits, you can use restart policies to automatically restart it.
You can use this to create containers that will start automatically when you computer restarts.

Restart Policies

Here are the basics:

• --restart no
  means that docker will never restart your container.
• restart …

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