Slides for the Docker for Java Developers workshop at JavaLand in 2017. It covers building and running containers. It also covers running GUI applications in Docker and using the Docker registry.

1. Johan Janssen, Info Support, @johanjanssen42

9. To enable continuous delivery
Quickly provision environments
Run the same software local and in the
cloud

11. Disk space efficiency
Memory efficiency
Speed
Compatibility (run anywhere)
Isolation
Versioning
Internet of Things (Raspberry Pi etc.)

12. docker run -i -t ubuntu:yakkety /bin/bash

13. DTAP environment
Build environment
Mainly running non-GUI applications
Continuous delivery, testing etc.
Development !

14. 

15. DevOps End users

16. Continuous delivery
Continuous deployment

18. 1
2
3
4
6
7
8
9
5

20. Main directory
BuildAndRunScript.sh
GeneralBase
Dockerfile
SonarQube
Dockerfile

21. FROM ubuntu:saucy
RUN apt-get -y install software-properties- common
RUN add-apt-repository ppa:webupd8team/java
RUN apt-get update && apt-get -y upgrade
RUN echo "oracle-java7-installer shared/accepted-oracle-
license-v1-1 boolean true" | debconf-set-selections
RUN apt-get -y install oracle-java7-installer
ENV JAVA_HOME /usr/lib/jvm/java-7-oracle

22. Create the Dockerfile
Build the containers:
<optional>cd GeneralBase
docker.io build -t GeneralBase .
cd .. </optional>

24. FROM GeneralBase
RUN apt-get install -y wget unzip
RUN wget http://dist.sonar.codehaus.org/sonarqube-4.2.zip
RUN unzip sonarqube-4.2.zip -d /opt
RUN rm sonarqube-4.2.zip
EXPOSE 9000
EXPOSE 9092
CMD ["/opt/sonarqube-4.2/bin/linux-x86-64/sonar.sh", "console",
"/bin/bash"]

25. Create the Dockerfile
Build the containers:
cd SonarQube
docker.io build -t SonarQube .

26. Start the container
docker.io run -p 9000:9000
–p 9092:9092 -d SonarQube

27. # docker.io ps –a
CONTAINER ID: ecbecf77461b
CREATED: 32 minutes ago
STATUS: Up 32 minutes
PORTS: 0.0.0.0:9000->9000/tcp,
0.0.0.0:9092->9092/tcp

28. Start / stop / restart
docker [start/stop/restart]
containerid
Follow SystemOut and SystemErr
docker logs -f containerid

29. GeneralBase
AppServerBase
Environment D
Environment T
Environment A
Environment P
Jenkins
JenkinsDataContainer
Sonar Gitblit Nexus

31. In the same container as the application
In a data container / data volume
On the host

32. Dockerfile
ENV JENKINS_HOME /var/JenkinsData
Docker commands
docker.io run -v /var/JenkinsData –name
JenkinsDataContainer ubuntu:saucy true
docker.io run -p 8080:8080 --volumes-from
JenkinsDataContainer -d Jenkins

33. # docker.io images --tree
└─ 179.9 MB Tags: ubuntu:saucy
└─253.6 MB
└─741.8 MB Tags: GeneralBase:latest
└─763.6 MB Tags: AppServerBase:latest
…
├─763.6 MB Tags: EnvironmentP:latest
└─865.6 MB Tags: Nexus:latest
└─808.3 MB Tags: Gitblit:latest
└─901.5 MB Tags: Sonar:latest
└─805.4 MB Tags: Jenkins:latest

34. real 4m11.729s
user 0m3.329s
sys 0m10.054s

37. Creating the Docker registry
docker run -p 5000:5000 registry

39. Modify container
Commit
docker.io commit 064f
192.168.56.31:5000/test-version-0.2
New containerid -> ff7e
Push
docker.io push
192.168.56.31:5000/test-version-0.2

40. Pull
docker.io pull 192.168.56.31:5000/
test-version-0.2
Run
docker.io run -i -t ff7e /bin/bash

41. docker images -tree
└─153b 194.2 MB test-version-0.1:latest
docker pull 192.168.56.31:5000/test-
version-0.2
ff7e: Download complete
153b: Download complete
docker images -tree
└─153b 194.2 MB test-version-0.1:latest
└─ff7e 194.2 MB test-version-0.2:latest

42. 

48. FROM java:8-jdk
RUN wget …/netbeans-8.0.2-linux.sh
RUN chmod +x netbeans*.sh
RUN sh netbeans*.sh --silent
CMD /usr/local/netbeans-8.0.2/bin/netbeans

49. Docker run command:
-v $PWD/workspace:/workspace

50. Workspace
Plugins
Application in application server
Maven repo
Configuration
Entire home folder??

52. “Eclipse Che is an IDE and developer workspace server that allows anyone to contribute
to a project without having to install software.”

53. Team
Frodo
image
Base
image
Team
Bilbo
image

54. • App Gimli
• App Elrond
Team
Frodo
• App Elrond
Team
Bilbo
• App Radagast
Team
Galadriel
App
means
application
server etc.

55. Where do
we place
the Elrond
App?
• App Gimli
• App Elrond
Team
Frodo
• App Elrond
Team
Bilbo
• App Radagast
Team
Galadriel

56. Tomcat
Image
Gimli Elrond Radagast

57. Fedora
Image
Development
environment

59. Define and run multi container Docker
applications
Using a Compose file
Link containers
‘docker-compose up’ to start the containers

60. TomcatGimli
DockerFile
TomcatElrond
DockerFile
TomcatRadagast
Dockerfile
DevEnv
Dockerfile
docker-compose.yml

61. tomcatgimli:
build: TomcatGimli
tomcatelrond:
build: TomcatElrond
tomcatradagast:
build: TomcatRadagast
developmentenvironment:
build: DevEnv
ports:
- "3389:3389"
links:
- tomcatgimli:gimli
# Makes gimli available on
# http://gimli:8080
- tomcatelrond:elrond
- tomcatradagast:radagast

62. Use docker-compose.override.yml
Put all the configuration in one container
Create small containers with configuration per
environment that inherit the application container
Commandline arguments

63. Use a (private) Docker registry
Keep environmental settings separate
Use Jenkins to manage everything
Do not add extra functionality like
OpenSSH
Think about topics such as security,
monitoring and logging
Inherit and/or compose containers
Separate concerns in separate containers

68. johan.janssen@infosupport.com
@johanjanssen42
https://bitbucket.org/johanjanssen/dockeride