Agenda
1. Introduction to Kubernetes
• Kubernetes Definition
• Introduction to Container
• Kubernetes Architecture
• Kubernetes Concept
• Kubernetes Configuration
• Red Hat Openshift – Logical
Architecture
2. Instructor led CI/CD
3. Instructor led Auto Scaling
2

• Open-source Container Orchestration Tools
• Developed by Google
• Help manage containerized applications in different deployment environment
3
Kubernetes Definition

4
DB
Monolith
Business Logic
UI
UI
Business Logic
DB
UI
Enterprise Svc Bus
Service
Service
UI
DB DB
DB DB
DB
MS MS MS MS MS
Monolithic Service – Oriented Microservices
Evolution of Application

1. VMs vs. Containers
2. Container features
• Lightweight
• Portable
• Isolated
5
Virtual Machines Containers
Infrastructure
Operating System
Container Runtime
Bins/Lib
App1
Bins/Lib
App2
Infrastructure
Operating System
Bins/Lib
App1
Bins/Lib
App2
OS OS
What is a Container?

1. Trend from Monolith to Microservices
2. Increase usage of Containers
3. Demand for a proper way of managing those
containers
6
What Problem Does Kubernetes Solve?

7
24/7
High availability
(No Downtime)
Scalability
(High Performance)
Disaster Recovery (Backup
and Restore)
What are The Task of Orchestration Tool?

8
Cloud Controller Manager
Runs cloud controller processes that take
care of e.g.
Node autoscaling, creating DNS entries, …
Controller Manager
Run all built-in controllers, like Node or
Replication Controller
Scheduler
Distributes unscheduled workloads
across the available worker nodes
API Server
Tracking state of all cluster components
and managing interactions between
them
Cluster DNS*
Provides in-cluster DNS for Pods and
Services
etcd
Key value store for all cluster
configuration data
Cloud Provider API*
API to manage cloud (AWS, Azure.
GCP, …) resources
Kubeproxy
Accepts and controls network
connections to the node’s Pods
Kubelet
Manages containers based on
incoming Pod specification
Container Runtime
Runtime that implements the
CRI, like CRI-O or containerd
Watches for changes
Watches for
changes
Reads from/
Writes to
Watches for changes
Talks to
Worker Node(s)
uses
Watches for changes
*
Control Plane
Optional Component
Kubernetes Architecture

Pod
Replication Controller
/ Deployment
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 a 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)
Kubernetes Concept
9

Each configuration file has 3 parts:
1. Metadata
2. Specification
3. Status
10
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deployment
labels:
app: myapp
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: nginx
Kubernetes Configuration

Challenges?
11
Complex A lot of configuration Harnessing Kubenetes
complexity

Enterprise Kubernetes Distribution
12
Container application platform
based on containers and
Kubernetes for building,
disturbing and running containers
at scale.

Red Hat Openshift – Logical Architecture
13