Docker deep-dive

Fact

Setting Expectation

What's the hype about containerization?

Rise of cloud native

• Provides Scalability
• Provides Isolation and Security
• Provides Predictable execution

As VMs were not very scalable, cloud community was looking for some new solutions. Meanwhile around 2002-2007 linux kernel was getting equipped with Namespace and cgroups.

What is a container?

A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. >Docker

The word “container” doesn’t mean anything super precise. Basically there are a few new Linux kernel features (“namespaces” and “cgroups”) that let you isolate processes from each other. When you use those features, you call it “containers”. >Julia Evans

First experiment with lunux kernel features

Then how container aka. Docker implements those

Let's dive in

Name + space

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• Java packages
• DNS hierarchy
• Directory structure

Linux namespaces

• Process id namespace
• Network namespace
• Mount namespace
• IPC namespace
• User namespace
• Cgroup namespace
• UTS namespace

Demonstration

control groups

Linux control groups

• Memory resource
• CPU resource
• Device resource
• Network resource
• Block IO
• UTS namespace

Demonstration

Business case

Docker architecture

Demonstration

Coming up

References