The busy developers guide to Docker

Maurice de Beijer @mauricedb

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Who am I?

• Maurice de Beijer• The Problem Solver• Microsoft Azure MVP• Freelance developer/instructor• Twitter: @mauricedb and @React_Tutorial• Web:http://www.TheProblemSolver.nl• E-mail: maurice.de.beijer@gmail.com

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Overview

• What are containers• Why use container technology?• What is Docker• Creating and running Docker images• Running an ASP.NET Core 1.0 App in a Docker

container• But we need more

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What is a container?

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Once upon a ship

6Loading cargo the old way

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A container ship these days

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Loading is a bit faster

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Running virtual machines

Virtual Machines vs Containers

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NamespacesCgroupsUnion file system

What is Docker?

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Docker Hub

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Why use Docker?

• Package an application with it’s dependencies• Dev environment behaves exactly like production• Less overhead means more deployments on a server• Deploy the same container in different clouds• Not just for cloud computing• Docker has standardized container formats• It’s open source

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Some other Docker Use Cases

• Simulate deployed environment during development– Each container simulates a machine

• Share containers between developers– Database containers with sample data• Also use in the (automated) QA environment

– Build containers with compilers and libraries• Also use in the CI environment

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Build

ing

cont

aine

rs

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Useful docker image commands

• docker images• docker pull <image name>• docker build –t <image name> <folder>• docker run <image name>• docker rmi <image id>• docker rmi $(docker images -q -f dangling=true)

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Useful docker container commands

• Docker ps• docker logs <container name>• docker stop <container name>• docker start <container name>• docker kill <container id>• docker rm <container id>• docker rm $(docker ps -a -q)

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Orchestration

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Dock

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ompo

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The

min

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ASP.

NET

Cor

e 1.

0 Ap

pon

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ux

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Dock

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Containers can be great…

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29…with the right tools!

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38Maurice de Beijer - @mauricedb