This document discusses breaking a monolithic application into microservices using Docker and Kubernetes. It begins by defining modularity and microservices. Docker is presented as a way to containerize applications and isolate dependencies to help break apart a monolith. Kubernetes is then introduced as an orchestrator to manage deploying and scaling the containerized microservices. The document concludes by discussing best practices for architecting microservices and using a DevOps approach for continuous integration, delivery, monitoring and automation when managing microservices on Docker and Kubernetes.

2. Breaking the Monolith to
Microservices with Docker and
Kubernetes
2
Tamir Dresher
@tamir_dresher
Cloud Division Leader
tamirdr@codevalue.net
Haim Kabesa
@haimkabesa
DevOps Division Leader
haimk@codevalue.net

3. 3
ModularityThe degree to which a system's components may be separated and rec
(https://en.wikipedia.org/wiki/Modularity(

4. Software Architecture is like Pasta
4By @benorama

5. Agenda
From Monolith to Microservices
How can Docker help us?
Orchestrating microservices with Kubernetes
Taking your microservices to the next level
5

6. The Monolith
6
User Management
Controllers
BL
Data Access
Media
Controllers
BL
Data Access
Survey
Controllers
BL
Data Access
• Large
• Deployment
• Scaling
• Single Storage
(usually)
• Single
Technology
• Simple
• Easy testing
• Fast
communication
• Single Storage
• Easy debugging

7. Breaking The Monolith
7
User Management
Controllers
BL
Data Access
Media
Controllers
BL
Data Access
Survey
Controllers
BL
Data Access

8. Breaking The Monolith
8
Survey
Controllers
BL
Data Access
User Management
Controllers
BL
Data Access
Media
Controllers
BL
Data Access

9. Just The Right Number Of Modules
9
number of modules
Module
integration cost
module development cost
The cost of
the software

10. What is a Microservice
A distributed unit of responsibility (logic & state) that is
independently versioned, deployed, and scaled
Interacts with other microservices over well defined interfaces and
protocols like REST or Queue-Based Messaging
10

11. Deployment
Service Discovery
Scaling
Security
Managing configuration
Health & Readiness checks
Logging
Load balancing
Data Persistency
Microservices Challenges

12. 12
Docker Kuberenetes

13. Not the only game in town, but certainly the loudest
Docker
Kubernete
s

14. Sealed application software.
A container image is a lightweight, stand-alone, executable package of
a piece of software that includes everything needed to run it: code,
runtime, system tools, system libraries, settings.
What is a container image?
/
etc dev lib proc
rpc ssh systemdudev

15. Hypervisor Architecture
Free space
Host OS
Server
VM
OS
App
VM
OS
App
VM
OS
App App
VM
OS
Hypervisor
Server
Container
Host OS
Docker Engine
App App App App

16. Docker is agnostic to the infrastructure layer
As a runtime docker provide access to devices, file system, privileges, variables, functions, API etc.
App
Docker Engine
App
Dev Machine
App
Docker Engine
App App
Docker Engine
App
Lift and
shift

17. The development cycle
17
Build
Container Registry
Binaries
Configuration
Dependencies
Image Container
Dockerfile
FROM microsoft/dotnet:2.0-runtime
WORKDIR /app
COPY /app .
ENTRYPOINT ["dotnet", "Voting.Processor.dll"]
Developer

18. Demo
Containers in action
18

19. Taking Tabs vs. Spaces to the extreme
19
Web
(python)
API
(ASP.NET Core)
Redis
Worker
(.NET Core Console)
RabbitMQ

20. Kuberenetes
An orchestrator that manages the containers environment
20
MonitorMonitor
Node(s)
Pod containercontainer
Deployment
• Configurations
• Secrets
• Services (discovery)
• …

21. Demo
Kubernetes Cluster
21

22. Autoscale
Limits:
Example:
if CPU utilization exceeds 50%, the autoscaler increases the pods to a
maximum of 10
22
resources:
requests:
cpu: 250m
limits:
cpu: 500m
kubectl autoscale deployment azure-vote-front --cpu-percent=50 --min=3 --max=10

23. Doing It Right
Architect
Modularity
Low Coupling, High Cohesion
Schema/API Versioning
DevOps
CI/CD
Automation
Monitor and Act
Testing in production
Load and Chaos
23

24. Summary
From Monolith to Microservices
How can Docker help us?
Orchestrating microservices with Kubernetes
Taking your microservices to the next level
24

25. Thank You!
25
Tamir Dresher
@tamir_dresher
Cloud Division Leader
tamirdr@codevalue.net
http://tamirdresher.com