Kubernetes has now become the de facto standard for deploying containerized applications at scale. The presentation will follow K8s core concepts, architecture and real life scenarios.

1. From Zero to Hero

2. ORI STOLIAR
CTO

3. ● K8s Overview
● K8s Architecture
● K8s Objects
● Installing K8s
● Show time!
● Q&A
AGENDA

4. CONTAINERS?

5. ?
SO…
WHAT IS
“Open-source system for automating deployment, scaling, and
management of containerized applications.”

6. Running containers
at scale
Provides Objects
and APIs for
building modern
applications
Open Source Container
Management
WHAT IS KUBERNETES?

7. HISTORY IN A NUTSHELL
Borg was founded
by Google
2004
Kubernetes was
introduced
2014
2015
Kubernetes
1.0 & CNCF
2017
Docker fully
embraces
Kubernetes
Minikube
2016

8. WHY ?

9. WHY KUBERNETES
Scalability
Portability
High Availability Open Source
Market Leader
Proven, Battle Tested

10. MARKET TRENDS

12. Architecture

13. CONTROL PLANE

14. kube-apiserver
● Exposes the Kubernetes API
● Handles REST requests from
kubernetes components and from
user/automating systems

15. kube-controller-
manager
● Responsible for running the
different controllers

16. ● Strongly consist, distributed
Key/Value store

17. kube-scheduler
● Responsible for placement of
Pods on Nodes in a cluster based
on various factors.

18. DATA PLANE

19. kubelet
● An Agent that runs on each node
of the cluster
● The kubelet takes a set of
PodSpecs that are provided and
ensures that the containers
described in those PodSpecs are
running and healthy

20. kube-proxy
● Kube-proxy is a network proxy
that runs on each node of the
cluster

21. apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: busybox
command: ['sh', '-c', 'echo
Hello Kubernetes! && sleep
3600']
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
OBJECTS apiVersion: v1
kind: Service
metadata:
name: dt-service
spec:
selector:
app: directeam
ports:
- protocol: TCP
port: 80
targetPort: 9376

22. Virtual cluster backed by the
same physical cluster
Volume
Namespace: prod
Pod
Labels: [app: dt-app]
Container
Name: dt-app
Image: nginx
Namespace
Pod
Labels
Volume
smallest deployable units of
computing
key/value pairs that are
attached to objects
Abstraction layer for
having persistence
storage

23. DaemonSet
● Implements a single instance of a pod on a
worker node.
● Common usage:
○ Monitoring
○ Logging
Node
Pod
Node
Pod
Master
Node
Pod

24. Deployment
● Deployment controllers handles declarative
updates for Pods and ReplicaSets.
● Manages changes from the actual state to
the desired state at a controlled rate.
Deployment
Pod Pod
ReplicaSet
Pod Pod
ReplicaSet
ReplicaSet
● Guarantees the availability of a specified
number of identical Pods.

25. Service
● An abstract way to expose an application
running on a set of Pods as a network service.
There are 3 types of Service:
○ Node Port
○ Load balancer
○ ClusterIP
Service
Pod Pod Pod

26. DNS
CoreDNS - Open Source DNS Server written in Go, Kubernetes default DNS server
since version 1.13
● CoreDNS runs as Deployment
● Default cluster domain - cluster.local
● Default allocated DNS records:
○ <SERVICE_NAME>.<NAMESPACE>.svc.cluster.local
○ <POD_IP>.<NAMESPACE>.pod.cluster.local

28. Installing
!

29. Kubectl
$> kubectl get deployment webapp
$> kubectl get pod web-pod-13je7 -o yaml
$> kubectl apply -f example-service.yaml
● Kubectl is a command line interface for
running commands against Kubernetes
clusters.
● By default, looks for config file at
$HOME/.kube

30. Installing
Kubernetes
● Kubeadm
● Kops
● Kubespray
● ...
● AWS EKS
● GCP GKE
● Azure AKS
● Rancher
● ...
Self installed Managed
VS

31. FOCUS ON WHAT'S IMPORTANT

32. CREATING EKS CLUSTER
● Creating EKS using eksctl:
$> eksctl create cluster --version=1.13 --
name=k8s-meetup --nodes=3 --node-ami=auto --
region=${AWS_REGION}
● Getting kubeconfig file:
$> aws eks --region <REGION> update-kubeconfig --
name <cluster_name>

33. KUBERNETES UI

34. IT’S SHOW TIME!
● Demonstration over AWS
● Run BE & FE services
● Expose the FE service to the internet via
Load balancer
● Use secure HTTPS connection
● Attach DNS record to the load balancer
● Scale automatically the FE service based on
collected metrics
● Scale manually the BE service.

35. ● Helm - deploy apps at ease
● Monitoring - what are the right
metrics?
● Logging - what do we even look
for?
NEXT STEPS

36. Q&A

37. Thank
You!
ori@directeam.io