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Learn what Docker is all about and see how
to dockerize a Rails application
Introduction to
Docker.
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Important disclaimer.
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Code is just text.
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Code is just text.
{ with fancy chars }
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Wouldn’t run on its own.
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LGTM!
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A tiny flashback.
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Silly question,
get dressed and
go to work!
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Simple code, runs on any Ruby
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Simple code, runs on any Ruby
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Simple code, runs on any Ruby
Not anymore…
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Let’s dockerize
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Let’s dockerize
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Keep building
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Keep building
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Images and containers
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Images and containers
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It’s all about isolation
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Language runtime
It’s all about isolation
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Language runtime
File system
It’s all about isolation
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Language runtime
File system
Binary dependencies
It’s all about isolation
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Language runtime
File system
Binary dependencies
Network ports
It’s all about isolation
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Language runtime
File system
Binary dependencies
Network ports
Users and groups
It’s all about isolation
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Not a virtual machine
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Docker
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Docker
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Docker
Great for local development
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Docker
Code + environment image/container
Great for local development
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Docker
Code + environment image/container
Great for local development
Tutorials lie, it’s never one image
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Docker
Code + environment image/container
Great for local development
Tutorials lie, it’s never one image
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Rule of .
1 container == 1 process
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Rule of .
1 container == 1 process
Rule them all: docker-compose
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DEMO TIME
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Docker vs. Kubernetes
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Kubernetes
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Kubernetes
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Kubernetes
Great for
production
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Docker vs. Kubernetes
❤
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https://youtu.be/4ht22ReBjno
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https://github.com/lewagon/rails-k8s-demo
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https://progapanda.org