Short Introduction to Docker. These slides show the basic idea behind the container technology Docker. The slides present the basic features for the daily use with Docker, Docker Compose, Docker Machine and Docker Swarm. Docker is specially important for DevOps, because it gives Software Developers more control about their dependencies in different environments.

2. Who I am?
• Robert Reiz
• Software Developer
• I started VersionEye
• Software Dev since 1998

3. Started 2009 DevOps Days in Belgium

4. DevOps is all about working together. About agile Infrastructure.
Youbuildit.Yourunit.Youtakeresponsibilityforit!

5. Shipment
without
Containers

6. 1956 Malcom McLean introduced the 40’Container - ISO 668.
> 15 Million inst.
2/3
of global trade run
over 40’Containers!

7. The Logistic Problem

10. Same Problem in Software Dev.

11. Java ? ? ?
Ruby ? ? ?
Node.JS ? ? ?
MySQL ? ? ?
Dev-Env. Test-Env. Prod-Env.

12. Java JKD 1.8.14 - Win32 JKD 1.8.1 - Lnx-64 JDK 1.7-patch UNX
Ruby 2.2.2 rvm 2.2.1 nat MRI 2.1.0 rubinius
Node.JS 4.0 win 4.0 Linux 4.0 Linux
MySQL 5.5 win 5.0 Linux 5.0 Linux
Dev-Env. Test-Env. Prod-Env.

13. Java .WAR / .EAR .WAR / .EAR .WAR / .EAR
Ruby GEM / GIT GEM / GIT GEM / GIT
Node.JS ZIP / GIT ZIP / GIT ZIP / GIT
MySQL .dmg .exe .dep
Dev-Env. Test-Env. Prod-Env.

14. Java
Ruby
Node.JS
MySQL
Dev-Env. Test-Env. Prod-Env.

15. What is Docker?

16. What is Docker?
❖ Open Source Project started in March 2013
❖ From the makes of dotCloud (PaaS).
❖ Received $162 Million Funding.
❖ Community grows rapidly!

17. What is Docker?
❖ Tiny VM (25 MB)
❖ Linux based - LXC Interface / libcontainer
❖ Own Namespaces and Cgroups!
❖ Shared resources with host system.
❖ It doesn’t work natively on Windows! Not yet!

18. Build - Ship - Run
Docker-Hub
Build RUN
RUN
RUN
docker push
docker pull
Server Farm Production

19. Build

20. Dockerfile
FROM ubuntu:14.10
MAINTAINER Robert Reiz <reiz@versioneye.com>
ENV LANG en_US.UTF-8
RUN apt-get update
RUN apt-get install -y --force-yes -q nginx
ADD nginx.conf /etc/nginx/nginx.conf
CMD nginx
EXPOSE 80

21. Build - Dockerfile
> docker build -t reiz/nginx:1.0.0 .
docker image => reiz/nginx:1.0.0

22. Ship

23. Ship Docker Image
> docker push reiz/nginx:1.0.0

24. Run

25. Fetch a Docker Image
> docker pull reiz/nginx:1.0.0
Download docker image reiz/nginx:1.0.0 from Docker Hub to local
Docker repository.

26. Run a Docker Container
> docker run reiz/nginx:1.0.0
Creates a Docker container out of the Docker image reiz/nginx:1.0.0.
It runs the nginx process.

27. More Commands
> docker stop <container_id>
> docker start <container_id>
> docker top <container_id>
> docker logs <container_id>
> docker rm <container_id>

28. Important
❖ A Docker Container doesn’t store state!
❖ You can not ssh into a Docker Container!
❖ A container is supposed to run 1 process!

29. Shell

30. Get a Shell
> docker run -it reiz/mongodb:1.0.2 /bin/bash
Starts a new Docker container with an active shell.

31. Get a Shell
> docker exec -it mongodb /bin/bash
Executes a command on a running contianer

32. Volumes

33. Mount a Volume
> docker run -v/mnt/mongodb:/data -d reiz/mongodb:1.0.2
Mounts “/mnt/mongodb” directory into the Docker container as “/data”.
Keep the data on the host. That’s how you keep data persisted.

34. Environment Variables

35. Set environment variables
> docker run --envLANG=en_US.UTF-8 -d reiz/mongodb:1.0.2
You can overwrite ENV variables from the Dockerfile here and also define
completely new ones.

36. Links

37. Link Docker Containers
> docker run —name mongodb -d versioneye/mongodb:1.0.2
> docker run —linkmongodb:mongo versioneye/api:1.0.0
MONGO_PORT=tcp://172.1.10.1:27017
MONGO_PORT_27017_TCP=tcp://172.1.10.1:27017
MONGO_PORT_27017_TCP_ADDR=172.1.10.1
MONGO_PORT_27017_TCP_PORT=27017
MONGO_PORT_27017_TCP_PROTO=tcp
Environmentvariablesareinjectedin2ndcontainer:

38. DEMO

39. Docker Compose
api:
image: versioneye/rails_api:2.5.7
ports:
- "9090:9090"
container_name: "api"
links:
- mongodb:db
- elasticsearch:es
mongodb:
image: reiz/mongodb:2.6.6_2
container_name: “mongodb"
elasticsearch:
image: reiz/elasticsearch:0.9.1
container_name: "elasticsearch"
docker-compose.yml
describes a whole
set of Docker
containers

40. Docker Compose
> docker-compose up -d
> docker-compose ps
> docker-compose stop

41. Docker Compose
> docker-compose build api
> docker-compose up --no-deps -d api
Updating a single container, not ALL of them.

42. Docker Compose
> docker-compose scale worker=3
Scaling up containers

43. DEMO

44. Docker Machine
> docker-machine create --driver virtualbox dev
Docker Machine: create, manage and remote control
docker machines/hosts.
BETA

45. Docker Machine
> docker-machine ls
> eval "$(docker-machine env dev)"
> docker ps

46. DEMO

47. Docker Swarm
DockerNode
DockerNode
DockerNode
DockerMaster
DockerSwarm
DockerClient
docker run
ServiceDiscovery
BETA

48. Continuous Testing with Docker Containers

49. Storage Driver
❖ AUFS
❖ devicemapper

50. DON’TUSE
DEVICEMAPPER!

51. Link Docker Containers
Linking only works on same hosts!

52. Service Discovery

53. Service Discovery
❖ Environment Variables
❖ Mount configuration via volumes
❖ Use a service like: etcd, zookeeper etc…

54. Orchestration

55. Docker Orchestration
❖ Docker Swarm
❖ CM-Tools (Chef, Puppet, Ansible, Salt)
❖ Kubernetes
❖ Mesos

56. ? ? ?
@RobertReiz
https://www.versioneye.com/go/docker:docker