Does it matter for Java Dev?

● just baked father

● SA at EPAM Systems

● primary skill is Java

● hands-on-coding with Groovy, Ruby

● trying to get in touch with Erlang/Elixir

● passionate about agile, clean code and devopsIzzet Mustafayev@EPAM Systems@webdizz webdizz izzetmustafaievhttp://webdizz.name

Agenda● what is docker?

● concepts

● how to

● dev env

● demo time

● what’s next

● summary

● q&a

Docker https://www.docker.com/

Docker - An open platform for

distributed applications for

developers and sysadmins.

● Develop an app with any language and any

toolchain

● Ship the “Dockerized” app and

dependencies anywhere

● Scale, move between data centers, update

with zero downtime and more

1.6.2released

Virtualization

Containerisation

Virtualization vs Containerisation

Container under the hood

Running containers

Concepts

Automation

● Build automation● Provisioning automation ● Configuration automation● Delivery Automation

● Environment as a code ● Prohibition of ad-hoc changes

Immutability

● Build● Run ● Destroy

Disposability

Containerisation

● Container as deployment artifact● Environment agnostic● New version - new container● All dependencies built in

Installation# apt-get update

# wget -qO- https://get.docker.com/ | sh

Assumption: Ubuntu

DockerfileFROM phusion/baseimage:0.9.12

RUN apt-get -y update \

&& apt-get -y install software-properties-common python-software-

properties \

&& add-apt-repository ppa:webupd8team/java \

&& apt-get clean

RUN apt-get -y update \

&& echo oracle-java8-installer shared/accepted-oracle-license-v1-1

select true | /usr/bin/debconf-set-selections \

&& apt-get -y install oracle-java8-installer \

&& apt-get clean \

&& update-alternatives --display java

ENV JAVA_HOME /usr/lib/jvm/java-8-oracle

1

3

4

5

Command Line$ docker build -t webdizz/baseimage-java8 .

$ docker images

$ docker run -d --name=java8 \

webdizz/baseimage-java8

$ docker ps

$ docker logs java8

$ docker stop java8

$ docker start java8

$ docker top java8

Docker Hub● User accounts and Authentication

● Public namespaces

● Automated builds

● Registry for images with checksums

● Meta-data store (comments, stars, list public

repositories)

Official images

Official images for Java

Official images for Java...

● Clojure● Tomcat● Jruby● Maven● Glassfish● Elasticsearch● Jenkins● SonarQube

● And more non-official

Dev Env

Perfect together

Routine is boring

Docker-compose is our way● YAML syntax

● Configuration inclusion/inheritance

● Comprehensive CLI

● Bash completion

Docker-compose YAML● image

● command

● links

● ports/expose

● volumes

● environment

● ...

Docker-compose CLI● build

● up

● logs

● ps

● run

● start/stop

● scale

● ...

Demo Time

Service Discovery

● Configuration registry

● DNS

● Health checking

Tools

● Consul

● Etcd

● Zookeeper

Resource Management

● Scheduling

● Task execution

● Auto scale

Tools

● Mesos

● Flynn

● Fleet

Monitoring

● Failures and Outages are expected for

distributed apps

● Business aware metrics matters

Tools

● Dropwizard Metrics

● Netflix Servo

● cAdvisor

Logging

● Critical for operation

● Even more critical for distributed operation

● Remains critical with operation in Docker

Tools

● Elasticsearch Logstash Kibana

● Elasticsearch Fluentd Kibana

Continuous Delivery

● Container as deployable artifact

● New container for new application version

● Start/stop proper version of container for proper

version of application

Tools

● Ansible

● Docker Swarm

Summary ● Easy and fast building of images

● Easy to share in your team

● Easy to scale

● Easy to work with new technologies

● Of course learning curve

● Production like dev env*

● http://docs.docker.com/

● https://hub.docker.com/

● http://www.fig.sh/

● https://mesosphere.com/

● http://www.consul.io/

● https://flynn.io

● https://github.com/coreos/fleet

● http://goo.gl/NEAfF2

● http://goo.gl/gfi94z

References

Q&A

Izzet Mustafayev@EPAM Systems@webdizz webdizz izzetmustafaievhttp://webdizz.name