Introduction to Docker by josé albornoz 

José Albornoz chilean ruby = <3 co-founding startup ! @eljojo eljojo.net 

what’s docker? 

what’s docker? • Management system for LXC Containers • Lightweight virtual machines • Applications are isolated and easy to distribute 

Demo 

how does it work? 

Docker Image • Snapshot of filesystem • They run one process 

Demo 

Layers 

Layers Ubuntu 

Layers Ubuntu nginx 

Layers Ubuntu nginx ruby 

Layers Ubuntu nginx ruby rails application 

Layers !"5e66087f3ffe Virtual Size: 192.5 MB # $"4d26dd3ebc1c Virtual Size: 192.7 MB # $"99ec81b80c55 Virtual Size: 266 MB # $"efc4fbcd007f Virtual Size: 584.5 MB # $"1f089cc15e82 Virtual Size: 584.5 MB Tags: ubuntu # #$"5c1088024f94 Virtual Size: 876.2 MB Tags: ubuntu-desktop # # $"afe3aba3e6e0 Virtual Size: 1.06 GB Tags: chrome # !"a97296852f54 Virtual Size: 606.2 MB # # $"4e81a0cd7256 Virtual Size: 606.2 MB Tags: ruby # !"c2b10e69958d Virtual Size: 596.8 MB # # $"0a422c0cdf16 Virtual Size: 596.8 MB Tags: redis # $"9f3000270ba2 Virtual Size: 643.8 MB # $"4b49b0b7aa4c Virtual Size: 643.8 MB # $"1535da87b710 Virtual Size: 660.8 MB Tags: nodejs 

Dockerfile • Images are created through Dockerfiles • Simple script that prepares the system to run the app 

Dockerfile FROM eljojo/golang-docker
 
 WORKDIR /app
 
 RUN git clone https://github.com/eljojo/shouldidothat.git .
 RUN go get -d
 RUN go build -o shouldidothat
 
 CMD ["/app/shouldidothat", "-c", "/etc/ shouldidothat/conf.json"] 

Container • Instance of Docker Image • Has it’s own private IP • You can map folders in host to folders in container 

Demo 

Registries • Like Git but for Docker Images • The Docker Index will host your public images for free 

CoreOS 

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Thanks! 

github.com/eljojo/altoids