Docker

Package your micro service into a shipping container.

https://www.docker.com

Containers v/s VMs

https://www.docker.com

Docker

• Packaging for a linux process:
  • immutable images
  • run everywhere
  • images are small and easy to cache
• Isolate processes:
  • each container has its own file system and ports
  • avoids conflicts between containers
  • set limits: IO, CPU, memory, ...
  • helps pack containers onto hosts
  • run 1000s of containers per node rather than 10s of VMs

Kubernetes

orchestrate your containers!

https://kubernetes.io

OpenShift V3

Docker / kubernetes based PaaS

Kubernetes Overview

Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

• Automatic binpacking.
• Self-healing.
• Horizontal scaling.
• Service discovery and load balancing.
• Automated rollouts and rollbacks.
• Secret and configuration management.
• Storage orchestration.

https://kubernetes.io

Kubernetes: Sub Atomic particles

• Pods
• Replication Controllers
• Services

Pod

group of one or more containers

• One or more Docker containers with:
• environment variables
• ports
• volumes
• Pod has its own unique IP address
• Containers can work locally together
• communicate locally on the pod IP and container ports
• share local or persistent disk

Replication Controller

makes sure that a pod is always up & available

   apiVersion: v1
   kind: ReplicationController
   metadata:
     name: nginx
   spec:
     replicas: 3
     selector:
       app: nginx
       spec:
         containers:
          - name: nginx
            image: nginx
            ports:
          - containerPort: 80

Service

each service has its own unique IP addres

   kind: Service
   apiVersion: v1
   metadata:
      name: myapp-service
   spec:
     selector:
        app: nginx
     ports:
        - protocol: TCP
          port: 80
          targetPort: 9376
     type: LoadBalancer //ClusterIp and NodePort
	  

Microservice on Kubernetes?

Each microservice typically has:

• Replication Controller
• Service

Kubernetes service discovery

For a service called foo-bar here is how you discover to it:

• $FOO_BAR_SERVICE_HOST
• $FOO_BAR_SERVICE_PORT

Develop microservices on Kubernetes

• Write some code
• Put code into docker image
• Create kubernetes metadata
• Apply the metadata
• Resize and rolling upgrades

Fabric8

https://fabric8.io

What is Fabric8?

• Microservices that run on Kubernetes
  • Management: (Console, Logging, Metrics)
  • Continuous Delivery
  • iPaaS
• Tools for Java developers

Fabric8: Java Tools

• Maven plugin
• Dependency Injection
  • CDI
  • Spring
• Java Libraries
• Integration Testing
  • Arquillian plugin for JUnit

Fabric8: Maven Plugin

Build docker image:

   $ mvn docker:build
					

Generate kubernetes json:

   $ mvn fabric8:json
					

Apply kubernetes json and image to kubernetes:

   $ mvn fabric8:apply
					

CDI / Spring

   @Inject
   @ServiceName("myapp-service")
   String myServiceUrl;
   
   @Inject
   @ServiceName("some-other-app")
   @Protocol("http")
   @External
   String externalAppUrl;
   
   @Inject
   @Endpoint
   @ServiceName("cheese-service")
   List<String> cheeseEndpointUrls;
   

http://fabric8.io/guide/cdi.html

Fabric8: Ops Tools

• Console
• Logging
  • Elasticsearch
  • Kibana
• Metrics
  • Prometheus
  • Grafana

Fabric8: Team Tools

• Chat, Issues & Notification
  • Hubot
  • Lets Chat
  • Slack
• Issues & Kanban
  • Taiga
• Source code
  • Gogs
  • Gerrit
  • Gitlab

Fabric8: iPaaS

• Integration as a Service
  • Apache Camel
• Messaging as a Service
  • Apache ActiveMQ
• APIs
  • Apiman
  • API Registry
• Console & Web IDE
  • hawtio
  • Eclipse Orion

CI/CD Pipeline in Fabric8

Demo

1. Aviation Monolith App with CI/CD pipeline.
2. Deploy it to various Environments.
3. Make changes in the code and push the changes to see automated build.
4. MySQL database in Kubernetes.
5. Other features inside Fabric8 console:
   • CI/CD - Jenkins, Gogs, Nexus
   • Docker Registry
   • ChatOps
   • Logging & Metrics
   • Messaging
   • Zookeeper
   • Zipkin

Questions?