docker for java developers at javaland

Continuous delivery with Docker

Run everything in Docker containersJohan Janssen, Info Support, @johanjanssen42

Docker

Transportation issue

Transportation solution

Software issue

Software solution

Docker compatibility

Why Docker To enable continuous delivery Quickly provision environments Run the same software local and in

the cloud

Docker vs Virtual Machines

Docker vs Virtual Machines Disk space efficiency Memory efficiency Speed Compatibility (run anywhere) Isolation Versioning Internet of Things (Raspberry Pi

etc.)

My first Docker container

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

Docker usecases

DTAP environment

Build environment

Mainly running non-GUI applications

Continuous delivery, testing etc.

Development !

Application and CD pipeline in Docker

Deployment pipeline

Version control

CompileQuality checks

TestingDeployments

DevOps End users

EtceteraSetup environment

Automatic versus manual deployment

Continuous delivery

Continuous deployment

Deployment pipeline

Example build pipeline

TAP

D

1

2

3 4

678

9

5

What to deliver?

Dockerfiles directory structure Main directory

BuildAndRunScript.sh GeneralBase

Dockerfile SonarQube

Dockerfile

Dockerfile GeneralBaseFROM ubuntu:saucy

RUN apt-get -y install software-properties- commonRUN add-apt-repository ppa:webupd8team/javaRUN apt-get update && apt-get -y upgradeRUN echo "oracle-java7-installer shared/accepted-oracle-license-v1-1 boolean true" | debconf-set-selectionsRUN apt-get -y install oracle-java7-installerENV JAVA_HOME /usr/lib/jvm/java-7-oracle

Build Create the Dockerfile Build the containers:

<optional>cd GeneralBasedocker.io build -t GeneralBase . cd .. </optional>

Dockerfile SonarFROM GeneralBase

RUN apt-get install -y wget unzipRUN wget http://dist.sonar.codehaus.org/sonarqube-4.2.zipRUN unzip sonarqube-4.2.zip -d /optRUN rm sonarqube-4.2.zip

EXPOSE 9000 EXPOSE 9092CMD ["/opt/sonarqube-4.2/bin/linux-x86-64/sonar.sh", "console", "/bin/bash"]

Build Create the Dockerfile Build the containers:

cd SonarQubedocker.io build -t SonarQube .

Run

Start the containerdocker.io run -p 9000:9000

–p 9092:9092 -d SonarQube

List all in(active) containers# docker.io ps –aCONTAINER 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

Controlling containers

Start / stop / restartdocker [start/stop/restart] containerid

Follow SystemOut and SystemErrdocker logs -f containerid

We need lots of Docker containersGeneralBa

se

AppServerBase

Environment D

Environment T

Environment A

Environment P

Jenkins

JenkinsDataContainer

Sonar Gitblit Nexus

Data storage In the same container as the application In a data container / data volume On the host

Data volumes Dockerfile

ENV JENKINS_HOME /var/JenkinsData

Docker commandsdocker.io run -v /var/JenkinsData –name JenkinsDataContainer ubuntu:saucy true

docker.io run -p 8080:8080 --volumes-from JenkinsDataContainer -d Jenkins

Diskspace# 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

Execution time

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

Docker overview

One ring to rule them all

Docker registry

Creating the Docker registrydocker run -p 5000:5000 registry

Updating containers

Docker client 1 (push) Modify container Commit

docker.io commit 064f192.168.56.31:5000/test-version-0.2

New containerid -> ff7e

Pushdocker.io push

192.168.56.31:5000/test-version-0.2

Docker client 2 (pull) Pull

docker.io pull 192.168.56.31:5000/

test-version-0.2

Rundocker.io run -i -t ff7e /bin/bash

Pull update onlydocker images -tree└─153b 194.2 MB test-version-0.1:latest

docker pull 192.168.56.31:5000/test-version-0.2 ff7e: Download complete153b: Download complete

docker images -tree└─153b 194.2 MB test-version-0.1:latest └─ff7e 194.2 MB test-version-0.2:latest

Development environment

Dockerfile

FROM java:8-jdk

RUN wget …/netbeans-8.0.2-linux.shRUN chmod +x netbeans*.shRUN sh netbeans*.sh --silent

CMD /usr/local/netbeans-8.0.2/bin/netbeans

Persisting data on host

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

What to persist?

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

Different options

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

Used by multiple teams

Team Frodo image

Base image

Team Bilbo image

Used by multiple teams

• App Gimli• App Elrond

Team Frodo

• App ElrondTeam Bilbo

• App RadagastTeam

Galadriel

App means

application server

etc.

Used by multiple teams

Where do we place

the Elrond App?

• App Gimli• App Elrond

Team Frodo

• App ElrondTeam Bilbo

• App RadagastTeam

Galadriel

Splitting the container

TomcatImage

Gimli Elrond Radagast

Splitting the container

FedoraImage

Development

environment

Docker Compose

Docker Compose

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

containers

Directory structure TomcatGimli

DockerFile TomcatElrond

DockerFile TomcatRadagast

Dockerfile DevEnv

Dockerfile docker-compose.yml

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

Environment specific configuration

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

Conclusion 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

Isolation

Isolation

Isolation

Isolation

Questions

johan.janssen@infosupport.com@johanjanssen42

https://bitbucket.org/johanjanssen/dockeride