Introduction to Docker

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

1. Introduction to Docker by josé albornoz
2. José Albornoz chilean ruby = <3 co-founding startup ! @eljojo eljojo.net
3. what’s docker?
4. what’s docker? • Management system for LXC Containers • Lightweight virtual machines • Applications are isolated and easy to distribute
5. Demo
6. how does it work?
7. Docker Image • Snapshot of filesystem • They run one process
8. Demo
9. Layers
10. Layers Ubuntu
11. Layers Ubuntu nginx
12. Layers Ubuntu nginx ruby
13. Layers Ubuntu nginx ruby rails application
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
15. Dockerfile • Images are created through Dockerfiles • Simple script that prepares the system to run the app
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"]
17. Container • Instance of Docker Image • Has it’s own private IP • You can map folders in host to folders in container
18. Demo
19. Registries • Like Git but for Docker Images • The Docker Index will host your public images for free
20. CoreOS
25. Thanks!
26. github.com/eljojo/altoids