Brought to you by Henryk Konsek

Containerize!Between Docker and Jube

@hekonsek

● Docker● Kubernetes● OpenShift● Fabric8● Jube

This talk

Server for running and managing Linux containers.

What is...

Operating-system-level virtualization.

What are Linux containers?

chroot on steroids + some kernel magic

What are Linux containers?

● slooooooow● gigantic images ● aggressive resource allocation ● bad API

Why not regular virtualization?

Container is the running image.

Key concepts

● image (immutable, no state)● container (mutable, has state)

Container is the running image.

Key concepts

Archived filesystem + metadata.

Docker image

Commands.

Docker awesomeness #1

Layers.

Docker awesomeness #2

WAR

Tomcat

JRE

Ubuntu base

Registries.

Docker awesomeness #3

Build once. Deploy everywhere!

Docker awesomeness #4

Immutable deployment. Use ENV variable to the container.

Docker awesomeness #4

“Recipes” for the new images.

Dockerfiles

FROM ubuntuEXPOSE 8080RUN apt-get install javaRUN mkdir /jarsADD target/app.jar /jars/CMD ["java", "-jar", "/jars/app.jar"]]

Create the new image

$ docker build -t com.me/app:1.0 .$ docker run -t com.me/app:1.0]

Let’s create the production-grade container!

Demo!

FROM ubuntuRUN apt-get update -qqyRUN apt-get install -qqy cowsayENTRYPOINT ["/usr/games/cowsay"]CMD ["Hello Docker!"]

Docker Maven plugin by Roland ‘Jolokia’ Huß

How can I put a fresh jar into an image?

How can I put a fresh jar into an image?

<image> <name>${project.artifactId}:${project.version}</name> <build> <from>hekonsek/fatjar:0.0.10-SNAPSHOT</from> <assemblyDescriptorRef>artifact</assemblyDescriptorRef> <exportDir>/jars</exportDir> </build> </image>

mvn docker:buid docker:push

Provided by the database community/vendor.

How can I get database image?

docker run -d -p 27017:27017 --name mongo mongo]

Yes. That’s all I can say ;) .

Any Red Hat customers using Docker in production?

The platform to scale Docker horizontally.

Kubernetes

by...

You can start many containers with your server Docker.

Why scale Docker?

But at some point you have to add more physical machines.

Why scale Docker?

Now networking between these containers becomes a challenge :( .

Why scale Docker?

High availability - single Docker server is SPOF.

Why scale Docker?

Helps you to keep your scaled Docker stuff together.

Kubernetes

Install and admin it yourself. Or...

Where can I find Kubernetes?

Where can I find Kubernetes?

- Red Hat Atomic- Red Hat Linux 7.1- CoreOS Linux- OpenShift 3- GKE (Google Container Engine)- Microsoft Azure- All the major cloud providers (soon)

- REST API- etcd key/value store- controller manager server

Kubernetes architecture - master node

- Docker server- kubelet- network proxy

Kubernetes architecture - minion node

Groups of containers running at the same physical machine.

Pod - unit of deployment

Kubernetes guarantees all or nothing deployment and execution of pods.

Pod - atomic unit of deployment

All containers within the pod can access the same volumes.

Pod nodes == shared disk

Pods uses direct connections for the intra-pod communication.

Pod - internal communication

Pods use network proxy for the inter-pod communication.

Pod - external communication

The network proxy

Guarantees N-instances of pods running at the same time.

Replication controller

Starts missing instances of the pods.

Replication controller

Performs health checks. Can kill and restart failing nodes.

Replication controller

In the Kubernetes world, starting the server is not human responsibility anymore! How cool is that?

Replication controller

The typical micoservices developer.

Services

Can we do better than Eureka?

How to discover the service?

Try to imagine something simpler.

Services coordinates == environment variables

String host = System.getenv("MONGO_SERVICE_DB_HOST");String port = System.getenv("MONGO_SERVICE_DB_PORT");Mongo mongo = new Mongo(host, Integer.parseInt(port));

Kubernetes + something extra.

OpenShift 3 == Cool PaaS

- Enterprise (private cloud)- On-Line (public cloud)- Origin (community project)

OpenShift 3 types

You can install OS Origin on your local machine as a Docker container.

OpenShift 3

- access external services using single URL- HAproxy instance bound to the services- TLS/SSL scope rules

OpenShift 3 - routing

Local (docker-based) cloud + Docker images + Kubernetes =smooth transition from dev to the production

OpenShift 3

OpenShift provides user groups based on the Kubernetes namespaces.

Multi-tenancy

OpenShift comes with the CI server that can build and deploy the containers for you.

Build & deploy pipeline

Off-the-shelf microservices!

OpenShift marketplace

Dev (and Ops) extras on the top of the Kubernetes.

Fabric8

Base examples you can use as templates for docker containers.

Value added by Fabric8 - quickstarts

Maven plugins making it easier to deploy Docker images into Kubernetes.

Value added by Fabric8 - developer tooling

Value added by Fabric8 - centralized logging

- CDI extension for Kubernetes- Kubernetes API client for Java- Spring Boot Kubernetes integration- Kubernetes JUnit goodies

Value added by Fabric8 - extra libraries

Value added by Fabric8 - fancy web UI

Pure-Java implementation of the Kubernetes API (no Docker here!)

Jube

Why Jube?

- your VPS doesn’t support Docker- your operating system doesn’t support Docker/Kubernetes- you’re not operational ready to go into the production with

Docker

Jube architecture

Demo!

CowSay and MongoDB in Kubernetes. How cool is that?