Docker for (Java) Developers
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This presentation provides an overview of Docker concepts and commands for Java developers. It covers creating Docker hosts, running containers, building images, running applications in Docker, linking containers, composing with Docker Compose, and an overview of Docker Swarm clustering. Live coding examples are shown for many of the Docker commands and concepts.
![Dockerfile anatomy
# Use latest jboss/base-jdk:7 image as the base
FROM jboss/base-jdk:8
# Set the WILDFLY_VERSION env variable
ENV WILDFLY_VERSION 9.0.0.Final
# Add the WildFly distribution to /opt, and make wildfly the owner of the extracted tar content
# Make sure the distribution is available from a well-known place
RUN cd $HOME && curl http://download.jboss.org/wildfly/$WILDFLY_VERSION/wildfly-$WILDFLY_VERSION.tar.gz | tar zx &
# Set the JBOSS_HOME env variable
ENV JBOSS_HOME /opt/jboss/wildfly
# Expose the ports we're interested in
EXPOSE 8080
# Set the default command to run on boot
# This will boot WildFly in the standalone mode and bind to all interface
CMD ["/opt/jboss/wildfly/bin/standalone.sh", "-b", "0.0.0.0"]
WildFly Image example](https://image.slidesharecdn.com/decks-150721211012-lva1-app6892/85/Docker-for-Java-Developers-10-320.jpg)
![Linking containers
[ jboss@22ac4068f95f ~]$ cat /etc/hosts
172.17.0.50 22ac4068f95f
127.0.0.1 localhost
172.17.0.43 db 84e9fc3e4455
172.17.0.44 modcluster 13784a898c33
Environment Variables
$DB_NAME
$DB_ENV_LANG
$DB_ENV_PG_VERSION
$DB_ENV_PGDATA
$DB_ENV_POSTGRES_PASSWORD
$DB_ENV_PG_MAJOR
$DB_ENV_POSTGRES_USER
$DB_PORT
$DB_PORT_5432_TCP
$DB_PORT_5432_TCP_PROTO
$DB_PORT_5432_TCP_ADDR
$DB_PORT_5432_TCP_PORT
$MODCLUSTER_NAME
$MODCLUSTER_PORT_80_TCP
$MODCLUSTER_PORT_80_TCP_PORT
$MODCLUSTER_PORT
$MODCLUSTER_PORT_80_TCP_ADDR
$MODCLUSTER_PORT_80_TCP_PROTO
docker run --link <container_name:alias>](https://image.slidesharecdn.com/decks-150721211012-lva1-app6892/85/Docker-for-Java-Developers-14-320.jpg)
Docker for (Java) Developers
- 2. 1. Docker concepts 2. Creating docker hosts with docker-machine 3. Running docker 4. Creating docker images 5. Running an Application Server in Docker 6. Changing container behaviour 7. 3 ways to deploy an application 8. Composing with docker-compose 9. docker-swarm overview 10. Questions? AGENDA
- 3. Who am I ? My name is Rafael Benevides I work for Red Hat since 2009 JBoss Developer Materials lead Apache DeltaSpike PMC member Middleware DevOps "guy" Some facts about me “ My work consists to help developers worldwide to be more effective in software development and promote tools and practices that help them to be more productive."e-mail: [email protected] Twitter: @rafabene
- 4. DISCLAIMER This presentation should take 45 minutes It will be 80% live-coding It won't cover "What is docker?", "Installing docker", "Motivations to use docker" topics But you will see/learn how to use docker and take you own conclusions about the motivations to start using it.
- 5. Docker Hello world Docker Client Docker Hub Docker Host Daemon Image 1 Image 2 Image 3 Image 1 Image 2 Image 3 Container 1 Container 2 docker run <image x> docker run hello-world docker run <image x> unix:///var/run/docker.sock
- 6. Docker Machine A L L O W S T H E C R E A T I O N O F D O C K E R H O S T SA L L O W S T H E C R E A T I O N O F D O C K E R H O S T S DRIVERSDRIVERS 1. AWS - Amazon Web Services 2. Digital Ocean 3. Exoscale 4. Generic ( Fedora, RHEL, CentOS, ... ) 5. GCE - Google Compute Enginer 6. IBM Softlayer 7. Microsoft Azure / Hyper-V 8. OpenStack 9. Oracle VirtualBox 10. Rackspace 11. VMware Fusion / vCloud Air / vSphere USEFUL COMMANDSUSEFUL COMMANDS docker-machine create -d <driver> <name> docker-machine ls docker env <name> ENV VARSENV VARS DOCKER_TLS_VERIFY DOCKER_HOST DOCKER_CERT_PATH DOCKER_MACHINE_NAME
- 7. Docker commands DOCKER RUNDOCKER RUN Creates a new container docker run <image> command docker run -it <image> command docker run --name -it <image> command docker run --name --rm -it <image> command docker run -d fedora /bin/bash -c "while true; do echo hello world; sleep 1; done"
- 8. Docker commands OT HE R DOCK ER COMMANDSOT HE R DOCK ER COMMANDS docker ps / docker ps -a docker stop <container> / docker stop -t=1 <container> docker rm <container> / docker rm `docker ps -aq` docker logs <container> / docker logs -f <container> docker attach <container> docker stats <container>
- 9. 2 Ways to create Docker Images COMMIT WAYCOMMIT WAY docker commit -m "<menssage>" <image name> docker history <image name> DOCKERFILE WAYDOCKERFILE WAY docker build -t <tag> <dockerfile path> DOCKERFILE REFDOCKERFILE REF FROM MAINTAINER WORKDIR ENV RUN COPY ADD EXPOSE VOLUME USER CMD
- 10. Dockerfile anatomy # Use latest jboss/base-jdk:7 image as the base FROM jboss/base-jdk:8 # Set the WILDFLY_VERSION env variable ENV WILDFLY_VERSION 9.0.0.Final # Add the WildFly distribution to /opt, and make wildfly the owner of the extracted tar content # Make sure the distribution is available from a well-known place RUN cd $HOME && curl http://download.jboss.org/wildfly/$WILDFLY_VERSION/wildfly-$WILDFLY_VERSION.tar.gz | tar zx & # Set the JBOSS_HOME env variable ENV JBOSS_HOME /opt/jboss/wildfly # Expose the ports we're interested in EXPOSE 8080 # Set the default command to run on boot # This will boot WildFly in the standalone mode and bind to all interface CMD ["/opt/jboss/wildfly/bin/standalone.sh", "-b", "0.0.0.0"] WildFly Image example
- 11. Changing container behaviour CHANGING ENV VARCHANGING ENV VAR docker run -e ... EXPOSING PORTSEXPOSING PORTS docker run -P ... docker run -p <host:container> ... docker-machine ip MOUTING VOLUMESMOUTING VOLUMES docker run -v <host:container> ...
- 12. 3 Ways to deploy an application 1 - MOUNTING A VOLUME1 - MOUNTING A VOLUME docker run -v <host:container> ... 2 - ADMINISTRATIVE CONSOLE2 - ADMINISTRATIVE CONSOLE docker run -p <host:port> ... 3 - INCLUDE INSIDE THE IMAGE3 - INCLUDE INSIDE THE IMAGE Dockerfile ADD your-awesome-app.war /opt/jboss/wildfly/standalone/deployments/
- 13. Cluster example Apache HTTPD + mod_cluster Postgres database WildFly instances
- 14. Linking containers [ jboss@22ac4068f95f ~]$ cat /etc/hosts 172.17.0.50 22ac4068f95f 127.0.0.1 localhost 172.17.0.43 db 84e9fc3e4455 172.17.0.44 modcluster 13784a898c33 Environment Variables $DB_NAME $DB_ENV_LANG $DB_ENV_PG_VERSION $DB_ENV_PGDATA $DB_ENV_POSTGRES_PASSWORD $DB_ENV_PG_MAJOR $DB_ENV_POSTGRES_USER $DB_PORT $DB_PORT_5432_TCP $DB_PORT_5432_TCP_PROTO $DB_PORT_5432_TCP_ADDR $DB_PORT_5432_TCP_PORT $MODCLUSTER_NAME $MODCLUSTER_PORT_80_TCP $MODCLUSTER_PORT_80_TCP_PORT $MODCLUSTER_PORT $MODCLUSTER_PORT_80_TCP_ADDR $MODCLUSTER_PORT_80_TCP_PROTO docker run --link <container_name:alias>
- 15. Docker compose docker-compose.yaml db: image: postgres ports: - "5432:5432" environment: - POSTGRES_USER=ticketmonster - POSTGRES_PASSWORD=ticketmonster-docker modcluster: image: goldmann/mod_cluster ports: - "80:80" wildfly: build: ../Dockerfiles/ticketmonster/ links: - db:db - modcluster:modcluster docker-compose up -d docker-compose ps docker-compose logs docker-compose build docker-compose scale <service>=x
- 16. DISCLAIMER You're about to see an overview of docker- swarm Some issues found: machine restart cross-host linking
- 17. Docker Swarm Discovery Services Docker Hub Static file Static list etcd consul zookeeper
- 18. Creating a Docker Swarm echo "Creating cluster ..." TOKEN=`docker run swarm create` echo "Got the token " $TOKEN echo "Creating Swarm master ..." docker-machine create -d virtualbox --swarm --swarm-master --swarm-strategy=spread --swarm-discovery token://$TOKEN swarm-master echo "Creating Swarm node 01 ..." docker-machine create -d virtualbox --swarm --swarm-discovery token://$TOKEN swarm-node-01 echo "Creating Swarm node 02 ..." docker-machine create -d virtualbox --swarm --swarm-discovery token://$TOKEN swarm-node-02 eval "$(docker-machine env --swarm swarm-master)" Strategy spread* binpack random
- 19. Kubernetes
- 21. THANK YOU!THANK YOU! RAFAEL BENEVIDESRAFAEL BENEVIDES [email protected]@REDHAT.COM @RAFABENE@RAFABENE