Introduction to Docker

Talk given in the Ruby User Group Berlin on June 5th, 2014

Transcript

1. Introduction to Docker
   by josé albornoz
   

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

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3. what’s docker?
   

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

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5. Demo
   

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6. how does it work?
   

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7. Docker Image
   • Snapshot of filesystem
   • They run one process
   

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8. Demo
   

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9. Layers
   

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10. Layers
    Ubuntu
    

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11. Layers
    Ubuntu
    nginx
    

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12. Layers
    Ubuntu
    nginx
    ruby
    

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13. Layers
    Ubuntu
    nginx
    ruby
    rails application
    

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14. 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
    

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

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16. 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"]
    

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

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18. Demo
    

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

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20. CoreOS
    

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25. Thanks!
    

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26. github.com/eljojo/altoids
    

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