By Rafael Benevides and Edson Yanaga Yes, Docker is great. We are all very aware of that, but now it’s time to take the next step: wrapping it all and deploying to a production environment. For this scenario, we need something more. For that “more,” we have Kubernetes by Google, a container platform based on the same technology used to deploy billions of containers per month on Google’s infrastructure. Ready to leverage your Docker skills and package your current Java app (WAR, EAR, or JAR)? Come to this session to see how your current Docker skill set can be easily mapped to Kubernetes concepts and commands. And get ready to deploy your containers in production.

1. 1
Kubernetes Introduction
Rafael Benevides & Edson Yanaga
benevides@redhat.com / yanaga@redhat.com
@rafabene / @yanaga
http://bit.ly/kubernetes-intro

2. Rafael Benevides
Director of Developer Experience at Red Hat
Apache DeltaSpike P.M.C
benevides@redhat.com
@rafabene
Java Certifications:
SCJA / SCJP / SCWCD / SCBCD / SCEA
JBoss Certifications:
JBCD / JBCAA
Red Hat Certifications:
OpenShift / Containers / Ansible
Other Certifications:
SAP Netweaver / ITIL / IBM Software Quality

3. Edson Yanaga
Director of Developer Experience at Red Hat
yanaga@redhat.com
@yanaga
Java Champion
Microsoft MVP

4. developers.redhat.com
http://developers.redhat.comhttp://developers.redhat.com

5. @rafabene / @yanaga
Why do you want to run your application inside containers?

6. @rafabene / @yanaga
● Lightweight footprint and minimal overhead,
● Portability across machines,
● Simplify DevOps practices,
● Speeds up Continuous Integration,
● Empower Microservices Architectures.
● Isolation
Container
Advantages
Container Engine

7. @rafabene / @yanaga
A way to run a Linux container:
$ docker run -d <image-name>
A single and isolated Linux process
running in a single machine

8. @rafabene / @yanaga
DevOps challenges for multiple containers
● How to scale?
● How to avoid port conflicts?
● How to manage them in multiple
hosts?
● What happens if a host has a
trouble?
● How to keep them running?
● How to update them?
● Where are my containers?
Node Node
Logger
Node
Node Node Node

9. @rafabene / @yanaga
Greek for “Helmsman”; also the root of the word
“Governor” (from latin: gubernator)
● Container orchestrator
● Supports multiple cloud and bare-metal environments
● Inspired by Google’s experience with containers
● Open source, written in Go
Manage applications, not machines
Meet Kubernetes

10. @rafabene / @yanaga
Version 1.3
Hosted on GitHub
800+ contributors
34,000+ commits
16,000+ GitHub stars
Red Hat
HP
IBM
Mesosphere
Microsoft
Project Partners
CoreOS
Pivotal
SaltStack
VMWare
http://kubernetes.io/
https://github.com/kubernetes/kubernetes
Open Source community

11. Master
API Server
Service Layer
VirtualPhysical Private Public
Persistent
Storage
Node Node
Logger
Node
Node Node Node
Dev
Ops
SCM
(Git/Svn)
CI/CD
Automation
Routing Layer
Registry
SDN Overlay Network
Controllers
- Scheduler
- Replication
- Services
- Builds
- Routes
- Deployment
Kubernetes
OpenShift
- Deployments
- Builds
- ImageStreams

12. @rafabene developers.redhat.com
Kubernetes Concepts
Pod Replication
Controller
Service Label
One or More Containers
Shared IP
Shared Storage Volume
Shared Resources
Shared Lifecycle
Ensures that a specified
number of pod replicas are
running at any one time
Grouping of pods, act as
one, has stable virtual IP
and DNS name
Key/Value pairs associated
with Kubernetes objects
(e.g. env=production)

13. @rafabene / @yanaga
Concept: Pod
● Group of containers
● Live and die together
● Share:
○ IP
○ Secrets
○ Labels *
○ Volumes *
* we will talk about these concepts later
Labels
Application
Administrative
console
Log collector
IP: 10.x.x.x
Volume

14. @rafabene / @yanaga
Concept: POD
Defining a POD as YAML:
apiVersion: v1
kind: Pod
metadata:
name: myPod
labels:
key: value
spec:
containers:
- name: mysql
image: username/image
- name: phpMyAdmin
image: username/image2
key: value
myPOD
mysql
phpMy..

15. SCM
(Git/Svn)
Master
API Server
Service Layer
VirtualPhysical Private Public
Persistent
Storage
Node Node
Logger
Node
Node Node Node
Dev
Ops
CI/CD
Automation
Routing Layer
Registry
SDN Overlay Network
Controllers
- Scheduler
- Replication
- Services
- Builds
- Routes
- Deployment
Kubernetes
OpenShift
- Deployments
- Builds
- ImageStreams

16. SCM
(Git/Svn)
Master
API Server
Service Layer
VirtualPhysical Private Public
Persistent
Storage
Node Node
Logger
Node
Node Node Node
Dev
Ops
CI/CD
Automation
Routing Layer
Registry
SDN Overlay Network
Controllers
- Scheduler
- Replication
- Services
- Builds
- Routes
- Deployment
Kubernetes
OpenShift
- Deployments
- Builds
- ImageStreams

17. SCM
(Git/Svn)
Master
API Server
Service Layer
VirtualPhysical Private Public
Persistent
Storage
Node Node
Logger
Node
Node Node Node
Dev
Ops
CI/CD
Automation
Routing Layer
Registry
SDN Overlay Network
Controllers
- Scheduler
- Replication
- Services
- Builds
- Routes
- Deployment
Kubernetes
OpenShift
- Deployments
- Builds
- ImageStreams

18. @rafabene / @yanaga
Concept: Replication Controllers
Defining a Replication Controller as YAML:
apiVersion: v1
kind: Pod
metadata:
name: myPod
labels:
key: value
spec:
containers:
- name: myPod
image: username/image
ports:
- name: http
containerPort: 8080
apiVersion: v1
kind: ReplicationController
metadata:
name: myRC
spec:
replicas: 4
template:
metadata:
spec:

19. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 2.0
Everything in Kubernetes can
have a label
Node
Logger
Node
NodeNode

20. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 2.0
Node
Logger
Node
NodeNode

21. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 2.0
Node
Logger
Node
NodeNode

22. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 2.0
Node
Logger
Node
NodeNode

23. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 2.0
Node
Logger
Node
NodeNode

24. @rafabene / @yanaga
Concept: Labels
App: Cool
Env: Dev
Version: 1.0
App: Cool
Env: Dev
Version: 2.0
App: Cool
Env: Prod
Version: 1.0
App: Cool
Env: Prod
Version: 2.0
Node
Logger
Node
NodeNode

25. @rafabene / @yanaga
Concept: Labels
metadata:
name: objectName
labels:
App: Cool
Env: Dev
Version: 1.0
Defining Labels as YAML:
(can be placed in any object metadata)
App: Cool
Env: Dev
Version: 1.0

26. @rafabene / @yanaga
Node 2
POD
App: Cool
Env: Prod
Version: 1.0
POD
Service
Labels selector:
● App=Cool
● Env=Prod
IP: 172.x.x.x
App: Nice
Env: Prod
Version: 1.0
Concept: Services
Node 1
POD

27. @rafabene / @yanaga
Concept: Services
apiVersion: v1
kind: Service
metadata:
name: myService
labels:
...
spec:
ports:
- port: 80
targetPort: 80
selector:
App: Cool
Env: Prod
Defining a Service as YAML:
myService
Labels selector:
● App=Cool
● Env=Prod
IP: 172.x.x.x

28. @rafabene / @yanaga
Using Environment variables:
Using internal DNS: $ ping mysql
Service discovery inside Kubernetes

29. @rafabene / @yanaga
Other concepts
Rolling updatesPersistent Volumes

30. @rafabene / @yanaga
Admin Owned
Users Owned
Persistent Volume
GCE PD AWS LB
NFS GlusterFS
Persistent Volume Claim
POD Volume
● Admin provisions them, Users claim them
● High-level abstraction
● Pods can mount PVCs as Volumes
Concept: Persistent Volumes

31. @rafabene / @yanaga
Deployment Concept: Rolling Updates
Pod
Replication
Controller
Pod Pod Pod
App: Cool
Version: 1.0
Version: 1.0
Replicas: 4
Backend
Replication
Controller
Version: 2.0
Replicas: 1
PodPod Pod Pod
App: Cool
Version: 2.0
Version: 1.0
Replicas: 3
Version: 2.0
Replicas: 2
Version: 1.0
Replicas: 2
Version: 2.0
Replicas: 3
Version: 1.0
Replicas: 1
Version: 2.0
Replicas: 4

32. @rafabene / @yanaga
Kubernetes lab

33. @rafabene / @yanaga
Application Overview

34. @rafabene / @yanaga

35. @rafabene / @yanaga
Hello World Service
- Greet
Guestbook Service
- Create
Guestbook Service -
Retrieve

36. @rafabene / @yanaga
Lab infrastructure
Hypervisor
RHEL VM Image
● OpenShift
● Kubernetes
● Docker
Container Development Kit
http://developers.redhat.com/products/cdk/download/

37. @rafabene / @yanaga
Kubernetes lab
VERY IMPORTANT
http://bit.ly/kubernetes-lab
Follow me on the Setup environment section!

38. developers.redhat.com
http://developers.redhat.comhttp://developers.redhat.com

39. @RAFABENE