The Kubernetes 101 workshop at ContainerCamp AU 2017 (22 May 2017)

1. KUBERNETES 101
HANDS ON WORKSHOP
CONTAINER CAMP
22 MAY 2017

2. VISHAL BIYANI
CTO & Founder at
infraCloud technologies (www.infracloud.io )
https://twitter.com/vishal_biyani
https://www.vishalbiyani.com
1st Kubernetes partner India
2nd in APAC region
Rancher partner - APAC

3. InfraCloud has published a FREE eBook on
“Scaling and deploying Kubernetes”
http://info.rancher.com/deploying-scaling-kubernetes-ebook

4. TIMELINES
Time (Minutes - total 180) Agenda
00 - 15 Introduction & Setting up
15 - 45 Quick walkthrough of concepts
45 - 95 3 concepts, code & labs - 15 minute each
95 - 100 Break
100 - 150 3 concept, code & labs - 15 min each
150 - 180 Open House

5. HAVE YOU?
• You have worked with either of
Puppet/Chef/Ansible/Salt?
• You have used Docker
• You have experience of one of:
Kubernetes/Mesos/Swarm/Openshift?

6. TABLE OF CONTAINERS.. ..
• What is Kubernetes, exactly?
• How to setup a Kubernetes Cluster?
• Various ways to get started with a Kubernetes cluster
• Kubernetes Architecture
• Kubernetes Concepts
• POD, Deployments, Services, Labels & Selectors etc.
• Kubectl Usage
• Deploying app with Helm

7. KUBERNETES - THE BOOKISH DEFINITION
• Kubernetes is an open-source
platform for automating
deployment, scaling, and
operations of application
containers across clusters of
hosts, providing container-
centric infrastructure (From
http://kubernetes.io/docs/whatisk8s/)
Open source project by
Google
Primarily targeted
at containerized
workloads
Platform - automates
deployment, scaling etc.
Abstracts hosts and
underlying
infrastructure from you
Portable - Run on
public/private cloud, data
center, your laptop -
doesn’t matter
Self - healing: It restarts,
replaces, scales, monitors
Containers
Extensible - replace certain
components if you want
to. Extend with pluggable
architecture

8. KUBERNETES HAS COMMON PATTERNS/DESIGNS
Need to run related
processes together in a
shared context
Integrating with underlying
storage (Block or Bucket
based)
Check health of
applications and maintain
certain number of
instances.
Scale instances based on
triggers.
Load balancing between
multiple instances of a
container
Provide easy and scalable
way to locate and reach
services (Aka service
discovery and naming)
Monitoring and log
management
Tagging and searching
instances dynamically to do
certain operations (For
example list all web servers
across all applications)
Rolling updates, Canary
deployments
Everything is API based- so
can be integrated with
external systems.

9. SETTING UP KUBERNETES
On Cloud & managed
Google
Container
Engine
StackpointCloud
Tectonic from
CoreOS
Openshift SaaS
DIY - any cloud/data center
Kubeadm
(official utility)
DIY On steroids
KOPS (Targeted
to AWS)
Kismatic from
Apperanda
Rancher -
provides
enterprise
features, multi
cluster support
Redhat
OpenShift -
comes with
complete
lifecycle
features
Many more: http://kubernetes.io/docs/getting-started-guides
Platform9

10. KUBERNETES ARCHITECTURE
Image Source: info.rancher.com/deploying-scaling-kubernetes-ebook

11. Lab - Setup Kubernetes in GKE & laptop setup
• GKE Cluster creation
• Kubectl on Google Cloud Console
• Checkout https://github.com/infracloudio/kubernetes-101

12. POD
• Related containers together
• Share same IP, port space & storage
etc.
• It’s a single unit for all practical
purposes
Code & Demo: Pod - create and destroy
Pod
nginx
monolith
NFSiSCSIGCE
10.10.1.100

13. POD - LAB

14. HEALTHCHECK
Hey, app v1... You
alive?
Kubelet
Pod
app v1

15. HEALTHCHECK - LAB

16. DEPLOYMENT
• Drive desired state
• Maintain desired POD instances
• Enable deployment mechanisms
such as rolling deploy, Canary,
pause/resume etc.
Deployment
ReplicaSet
Pod

17. DEPLOYMENT LAB

18. ROLLING UPGRADE - DEPLOYMENT LAB

19. SERVICES
• Provide a fixed endpoint for PODs irrespective of
deletion/movement/modification of POD
• Expose services/endpoints to outside cluster or to world
• Services utilize labels to target PODs to represent

20. SERVICE TYPES
ExternalName (Kubenretes 1.5 onwards)
• Maps to a external provided CNAME like service.orgname.com
ClusterIP (Default)
• Exposes service only within cluster
NodePort
• Creates a ClusterIP + exposes the same port on every node/host. This is typically used if
you want to use an external loadBalancer
LoadBalancer
• NodePort+Creates a LB in cloud provider (Such as ELB) and points to respective ports

21. SERVICES- LAB

22. LABLES AND SELECTORS
Lables:
“relase”:”1.4”
“environment”:”QA”
“app”:”billing”
Selectors:
env = prod
release in (1.3, 1.4)
app != payment
• Classification mechanism
• Lables
• Tag things
• Think like “roles”
• Selectors
• Filters & conditions

23. EXAMPLE
Pod
hello
Pod
hello
labels:
version: v1
track: stable
labels:
version: v1
track: test
selector: “version=v1” selector: “track=stable”
Pod
hello
Pod
hello
labels:
version: v1
track:
stable
labels:
version: v1
track: test

24. SECRETS & CONFIG MAPS
• Secrets
• Deliver sensitive data to intended target
• ConfigMap
• Configuration properties

25. NAMESPACES & NODES
• Namespaces
• Logically separate cluster
• Nodes
• Info about nodes

26. MORE TYPES
Volume types for
handling persistent data.
They interact with cloud
provider's storage.
StatefulSet - for
maanging clusters with
strong identity
requirements (Kafka,
Elastic, Zookeeper etc.)
DaemonSet - things
which need to run on a
set or all nodes of cluster.
For example logging
agents or
Job - ensures a certain
number of PODs execute
the process and upon
completion terminates.
(For batch jobs)

27. HELM - PACKAGE MANAGER FOR KUBERNETES
• Helm is a package manager for Kubernetes
• Tiller - Repo Server
• Chart - a package
• Helm is the client for Tiller
• Charts are in a repo (Typically some Git repo)
• A chart - is set of manifests
• The values can be defaulted to or overridden as input from user
• A chart is released as a release so that it can be tracked.

28. HELM ON MY MACHINE
• Configure ~/.kube/config file - verify with kubectl
• ‘helm init’ - initializes all directories and standard repo
• helm search WordPress
• helm install --name cc-release stable/wordpress

29. HELM - LAB

30. RESOURCES
• The workshop material & codelabs at
https://github.com/GoogleCloudPlatform/kubernetes-
workshops
• http://kubernetesbyexample.com
• info.rancher.com/deploying-scaling-kubernetes-ebook

31. Scalable Microservices with Kubernetes
https://www.udacity.com/course/scalable-microservices-with-kubernetes--ud615

32. ধন্যবাদ!
Dank je!
Kiitos!
આભાર!
धन्यवाद!
Grazie!
Je vous remercie!
ありがとうございました！
ਤੁਹਾਡਾ ਧੰਨਵਾਦ!
நன்றி!
ధన్యవాదాలు!
നന്ദി!
THANK YOU!