Learning Docker from Square One
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![Page 1: Learning Docker from Square One](https://reader031.fdocuments.net/reader031/viewer/2022030318/5a6476f67f8b9afc4d8b4699/html5/thumbnails/1.jpg)
Learning Docker From Square One
Developer Evangelist, Codefresh
Chloe Condon
@chloecondon
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I’m Whaley Glad You’re Here! 🐳
Me at my last DockerCon!
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Our Docker journey begins…
Hi, I’m Chloe!
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Now a Developer Evangelist(Woo! Thanks Docker! 🎉 )
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Let’s Start From the Very Beginning
“A very good place to start…”
@chloecondon
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Images & Containers• Layers• DockerHub• Official Images• Tagging/Pushing• Dockerfiles
I’ll Show You A Thing Or Two About…Volumes• Persistant data• Bind MountingDocker Compose• yaml files• Compose commands• Building images
@chloecondon
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Demo Time!
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Images & Containers
What’s the difference? 🤔
@chloecondon
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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
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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
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@chloecondon
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Think of it this way…
Image = DVD 💽
Container = DVD Player 📺
@chloecondon
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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
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@chloecondon
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@chloecondon
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@chloecondon
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So, a container is a lightweight VM, right?
@chloecondon
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So, a container is a lightweight VM, right?
Think of VMs like a 🏡…
…and containers like an 🏢…
…stay with me here!
@chloecondon
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So, a container is a lightweight VM, right?
@chloecondon
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So, a container is a lightweight VM, right?
@chloecondon
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Let’s Review!
@chloecondon
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So, a container is a lightweight VM, right?
“Docker is not a virtualization technology, it’s an application delivery technology” -Mike Coleman
@chloecondon
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Layers
@chloecondon
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Layers
@chloecondon
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Layers
@chloecondon
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Layers
@chloecondon
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Layers
@chloecondon
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Layers
@chloecondon
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DockerHub
@chloecondon
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Tags
@chloecondon
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Enter Tags!
@chloecondon
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Tags
@chloecondon
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Tags
@chloecondon
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Tags
@chloecondon
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Tags… what’s in a name? -Shakespeare… jk
@chloecondon
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Push it!
@chloecondon
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Push it!
@chloecondon
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Push it!
@chloecondon
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Dockerfiles are……instructions…
…that you need to optimize!
@chloecondon
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Things to consider with DockerfilesEphemeral
( unnecessary packages
1 container = 1 concern
Minimal layers
@chloecondon
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@chloecondon
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@chloecondon
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@chloecondon
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@chloecondon
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@chloecondon
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@chloecondon
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@chloecondon
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Volumes
@chloecondon
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Volumes
Data volumes are designed to persist data, independent of the container’s lifecycle.
@chloecondon
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VOLUME [“/data”]
Volumes
@chloecondon
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• Host Volumesdocker run -v /path/on/host:/path/in/container ...
• Anonymous Volumesdocker run -v /path/in/container ...
• Named Volumesdocker volume create somevolumename docker run -v name:/path/in/container ...
Volumes
@chloecondon
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Volumes
@chloecondon
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Docker Compose1. Define with a Dockerfile2. Write a docker-compose.yml3. Run docker-compose up
@chloecondon
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Demo Time!
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Great Resources!• Play with Docker )• Bret Fisher’s class on Udemy *• Docker Docs 🐳• Anything from a Docker Captain! 🚢 (docker.com/captains)• Codefresh 🍃
@chloecondon
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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!