Vagrant or Docker for Java devenvironment?Engineering Communities

22 October 2015

Orest IvasivSoftware engineer, SoftserveDocker hobbyist

Disclaimer

Assume You know smth about Docker This is not a Docker's promo

Outline

1. Container's usage concept 2. Thoughts 3. Case study 4. Experience sharing

"It works in my development environment"

Containers in our Life

Containers in our Life - Evolution

Containers in our Life - Evolution Cont.

Thoughts About Container benefits

Different programming Languages: Java, Ruby, Python, JS/Node.js, Erlang, etc...

Different ecosystems: JVM, JS, Ruby

Application packaging

Different Deployment Models

Run-time environment collision

Container Benefits

Unified form factor: - Different internals - Same application run approaches

Docker?

"Docker is a tool for building and deploying applications by packaging them intolightweight containers."

Pipeline - Traditional

Pipeline - Docker

Terms

Container How you run your application

Images How you store your application

Docker file

FROM debian:stableRUN apt-get update && apt-get install -y --force-yes apache2EXPOSE 80 443VOLUME ["/var/www", "/var/log/apache2", "/etc/apache2"]ENTRYPOINT ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]

Most Popular Docker commands

docker run

docker stop

docker start

docker restart

docker logs

docker exec

docker rm

docker rmi

docker ps

docker images

Docker tips

Use Docker compose

It's impossible to use many container w/o automation tool like Compose

Use Docker for dev and ops

Reuse public images

Avoid manual/custom installation of popular software: db, queue, caches, etc

Docker is convenience app distribution model

Docker Logs

Log Viewer

Aggregated Log Viewer

Docker tips - Image hierarchy

Maven + Docker

alexec/docker-maven-plugin (https://github.com/alexec/docker-maven-plugin)

rhuss/docker-maven-plugin (https://github.com/rhuss/docker-maven-plugin)

spotify/docker-maven-plugin (https://github.com/spotify/docker-maven-plugin)

Gradle + Docker

gesellix/gradle-docker-plugin (https://github.com/gesellix/gradle-docker-plugin)

bmuschko/gradle-docker-plugin (https://github.com/bmuschko/gradle-docker-plugin)

Case Study

Tech stack: Spring MVC, Spring Boot, JS/Angular.js, RoR

3d party : Consul, HAPpoxy, Postgres, Elasticsearch, Redis, Nginx, RabbitMQ

Spring Boot -> Docker

Install Java

Install app JAR file

Configure Image to run Java on start

Add external configuration

Build Image

FROM java:8VOLUME /tmpADD gs-spring-boot-docker-0.1.0.jar app.jarRUN bash -c 'touch /app.jar'ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

Run App

docker run -d --name myservices -p 4780:4780 --restart always -v /var/log/my-services:/var/log/SRV \ -e CONF_LOCATION=s3://my-storage/test.properties \-e SERVICE_HOST_NAME=̀hostname --ip̀ docker.mycorp.net/myservices:develop

Update staging env

Compare running container with what's been built by CI

Pulls latest images from Docker registry

Stops old version

Launches new version

Register service in Consul

Development Env issues

Developing 2 applications

Requires 9+ apps for properly functional integrated env

Windows Machines :-(

"Golden"/Base VM is hard to maintain

Vagrant ?

"Vagrant is not for managing machines, Vagrant is for managing developmentenvironments. The fact Vagrant spins up machines is mostly historic."

Mitchell Hashimoto

Vagrant features

docker provisioning

docker provider

Vagrant popular commands

vagrant up

vagrant provision

Vagrant docker provisioner works not as expected.

Vagrantfile

VAGRANTFILE_API_VERSION = "2"Vagrant.configure(VAGRANTFILE_API_VERSION) do |config| config.vm.hostname = "docker-host"

# Spin up a "host box" for use with the Docker provider # and then provision it with Docker config.vm.box = "slowe/ubuntu-trusty-x64" config.vm.provision "docker"

# Disable synced folders (prevents an NFS error on "vagrant up") config.vm.synced_folder ".", "/vagrant", disabled: trueend

Container setting YAML

---- name: nginx-01 image: nginx ports: ['80:80', '443:443']- name: redis-01 image: redis ports: ['6379:6379']

Iterate container setting

# Iterate through the entries in the YAML filecontainers.each do |container|config.vm.define container["name"] do |cntnr|

# Disable synced folders for the Docker container # (prevents an NFS error on "vagrant up") cntnr.vm.synced_folder ".", "/vagrant", disabled: true

# Configure the Docker provider for Vagrant cntnr.vm.provider "docker" do |docker|

# Specify the Docker image to use, pull value from YAML file docker.image = container["image"]

# Specify port mappings, pull value from YAML file # If omitted, no ports are mapped! docker.ports = container["ports"]

# Specify a friendly name for the Docker container, pull from YAML file docker.name = container["name"] endend

History Notes

Vagrant

Initial release - March 8, 2010

Current Version - July 17, 2015 - v.1.7.4

Docker

Initial release - March 2013

Current Version - October 12, 2015 - v.1.8.3

References

SO: Should I use Vagrant or Docker.io for creating an isolated environment?(http://stackoverflow.com/questions/16647069/should-i-use-vagrant-or-docker-io-for-creating-an-isolated-environment)

Running Multiple Docker Containers in Vagrant with YAML (https://github.com/lowescott/learning-

tools/tree/master/vagrant-docker-yaml)

Thank you

22 October 2015Tags: docker, vagrant (#ZgotmplZ)

Orest IvasivSoftware engineer, SoftserveDocker hobbyisthttp://halyph.com (http://halyph.com)

@halyph (http://twitter.com/halyph)