Exploring Docker at Gilt
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Docker is a tool that allows users to easily create and manage lightweight containers. It has four main components: Dockerfile for building images, a command line tool, an API, and a registry. At Gilt, Docker is used to build images for every version of applications and deploy them by pulling images to hosts and running containers. Docker provides benefits like lightweight runtimes, application isolation, stable environments, and repeatability.
Exploring Docker at Gilt
- 2. A few concepts first... ● ● ● ● ● ● ● cgroups namespaces chroot containers lxc aufs Containers are not VMs
- 3. Ok… so, what is docker? ● An easy way to create containers ○ Portable ○ Self-sufficient ● Uses lxc and aufs* ● Written in go
- 4. Ok… so, what is docker? ● 4 main components: ○ ○ ○ ○ Dockerfile (image building tool) A command line tool A service api A registry
- 5. Docker - dockerfile # cat Dockerfile FROM ubuntu:13.04 RUN apt-get install python-software-properties RUN add-apt-repository ppa:duh/golang RUN apt-get update RUN apt-get install golang ADD . /lalala EXPOSE 5000 CMD cd /lalala && go run lalala.go # docker build -t lalala:1.0.0 .
- 6. Docker - command line tool # # # # docker docker docker docker run lalala:1.0.0 ps kill 6465778d29e4 logs 6465778d29e4
- 7. Docker - service api # docker run ubuntu echo “lalala” POST /images/create POST /containers/create POST /containers/{id}/start # docker ps GET /containers/json
- 8. Docker - registry ● There is a public and a private option ● Public: index.docker.io ● It has an API
- 9. How we use docker @ gilt? ● We build images for every version of every application. ● We deploy by pulling images to the selected hosts and run containers.
- 10. Why we like Docker? ● ● ● ● Lightweight runtime environments Application isolation Stable runtime environments Repeatability