Learning Docker from Square One

Oct 26, 20174 likes2,257 views

Being a newer technology, Docker has yet to make its way into some computer science training programs. College programs, bootcamps, and online resources have yet to jump onto the container train; so, what's the best way for newer engineers to learn Docker from square one? Chloe (former actress turned developer) tells her story about how she went from wondering "What's a Docker?" to helping teach others about Docker and instead asking "What?? You haven't heard of Docker?". This talk is perfect for anyone new to Docker looking for how to get started, or for those interested in learning how to teach Docker to new users.

Learning Docker
From Square One
Developer Evangelist, Codefresh
Chloe Condon
@chloecondon

I’m Whaley
Glad You’re
Here! 🐳
Me at my last DockerCon!

Our Docker journey begins…
Hi, I’m Chloe!

Now a Developer Evangelist
(Woo! Thanks Docker! 🎉 )

Let’s Start From the Very Beginning
“A very good place to start…”
@chloecondon

Images & Containers
• Layers
• DockerHub
• Official Images
• Tagging/Pushing
• Dockerfiles
I’ll Show You A Thing Or Two About…
Volumes
• Persistant data
• Bind Mounting
Docker Compose
• yaml files
• Compose commands
• Building images
@chloecondon

Images & Containers
What’s the difference? 🤔
@chloecondon

Let’s Break it Down…
An image is an application you’d like to run
A container is a running instance of an image
@chloecondon

Think of it this way…
Image = DVD 💽
Container = DVD Player 📺
@chloecondon

Think of it this way…
Docker Image = The basis of a Docker container.
Represents a full application.
Container = The standard unit in which the
application service resides and executes.
@chloecondon

So, a container is a lightweight VM, right?
@chloecondon

So, a container is a lightweight VM, right?
Think of VMs like a 🏡…
…and containers like an 🏢…
…stay with me here!
@chloecondon

So, a container is a lightweight VM, right?
“Docker is not a virtualization technology, it’s an application
delivery technology” -Mike Coleman
@chloecondon

Tags… what’s in a name? -Shakespeare… jk
@chloecondon

Dockerfiles are…
…instructions…
…that you need to optimize!
@chloecondon

Things to consider with Dockerfiles
Ephemeral
( unnecessary packages
1 container = 1 concern
Minimal layers
@chloecondon

Volumes
Data volumes are designed to persist data,
independent of the container’s lifecycle.
@chloecondon

• Host Volumes
docker run -v /path/on/host:/path/in/container ...
• Anonymous Volumes
docker run -v /path/in/container ...
• Named Volumes
docker volume create somevolumename
docker run -v name:/path/in/container ...
Volumes
@chloecondon

Docker Compose
1. Define with a Dockerfile
2. Write a docker-compose.yml
3. Run docker-compose up
@chloecondon

Great Resources!
• Play with Docker )
• Bret Fisher’s class on Udemy *
• Docker Docs 🐳
• Anything from a Docker Captain! 🚢
(docker.com/captains)
• Codefresh 🍃
@chloecondon

Thank You!
@chloecondon on most things!
My articles on Medium cover:
• Docker Basics
• Volumes
• Tags
• & much more!
Come to my Hallway Track after this!
Otherwise, I’ll be chilling in the foam pit!

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