Docker&kubernetes

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Introduction to Docker and to the basic elements that we can start using from Kubernetes to deploy and connect our first application

Tecnologia

@Laura_Morillo
Docker &
Kubernetes
Simplifying developer’s life

@Laura_Morillo@Laura_Morillo
● Twitter: @laura_morillo
● GDG Madrid Organizer, WTM Lead
● Startup lover.
● Backend developer at Seedtag.
● Google Developer Expert (Cloud)
● +10 years working with different
technologies.

@Laura_Morillo
Docker OOP Simile
Image
Container
Class
Instance

@Laura_Morillo
Dockerfile
Docker Repository
(images)

@Laura_Morillo
Node.js
Container for Staging Container for Production
Dockerfile
Docker Repository
(images)
(containers)

@Laura_Morillo
Node.js
Redis
Loadbalancer
Node.js
Loadbalancer
Node.js
Redis Redis

@Laura_Morillo
Kubernetes: cluster
Cluster
Node 1
(VM or physical
machine)
Node 2
(VM or physical
machine)
Node 3
(VM or physical
machine)

@Laura_Morillo@Laura_Morillo
Pods
Node.js
Redis
● Smallest unit
● Contains one or more containers
● Volumes for persistence
● Ephemeral entities
● One IP per pod
● You shouldn’t create them
directly
Volumes

@Laura_Morillo@Laura_Morillo
Deployments
● Drive current state toward
desired state
V1
V1

@Laura_Morillo
Deployments
kubectl apply -f my-deployment.yaml

@Laura_Morillo
Deployments
Cluster
Node 1
Node 2
Node 3

@Laura_Morillo
Deployments
Redis
V1
My
Image
V1
Redis
V1
My
Image
V1
Cluster
Node 1
Node 2
Node 3

@Laura_Morillo@Laura_Morillo
Services
● Deﬁnes a logical set of pods
and a policy to access them
Redis
V1
My
Image
V1
Redis
V1
My
Image
V1
Nginx V1
Service

@Laura_Morillo
Services: ClusterIP
Redis
V1
My
Image
V1
Redis
V1
My
Image
V1
Cluster
Node 1
Node 2
Nginx
V1
my-node-app-service
nginx-service

@Laura_Morillo
Services: ClusterIP
Redis
V1
My
Image
V1
Redis
V1
My
Image
V1
Cluster
Node 1
Node 2
Nginx
V1
Error!
my-node-app-service
nginx-service

@Laura_Morillo
Services: LoadBalancer
Public IP:
Ej: 123.45.678.9

@Laura_Morillo
Services: LoadBalancer
Redis
V1
My
Image
V1
Redis
V1
My
Image
V1
Cluster
Node 1
Node 2
Nginx
V1
IP: 123.45.678.9
my-node-app-service
nginx-service

@Laura_Morillo@Laura_Morillo
Deployments
● Controls new versions
● Rollback to previous versions
● Update strategy
V1
V2
Deployment

@Laura_Morillo
Deployments: RollingUpdate

@Laura_Morillo
Deployments: RollingUpdate
Redis V1
My Image V1
Redis V1
My Image V1

@Laura_Morillo
Deployment: RollingUpdate
Redis
V1
My Image
V1
Redis
V1
My Image
V1

@Laura_Morillo
Deployment: RollingUpdate
Redis
V1
My Image
V1
Redis
V1
My Image
V1
Redis
V1
My Image
V2

@Laura_Morillo
Deployment: RollingUpdate
Redis
V1
My Image
V1
Redis
V1
My Image
V1
Redis
V1
My Image
V2
Redis
V1
My Image
V2

@Laura_Morillo@Laura_Morillo
HorizontalPodAutoscaler
● Scales the number of pods
from a deployment
● At the moment, only based
on the CPU utilizationRedis
V1
My
Image
V2
HorizontalPodAutoescaler: From 2 to 10
Redis
V1
My
Image
V2
Min 2
Redis
V1
My
Image
V2
Max 10
1 2 10

@Laura_Morillo
Summary
● Kubernetes is a cluster manager that helps us to:
○ Deploy our applications from Docker containers
○ Structure our application with microservices
○ Connect the diﬀerent microservices
○ Provide external access to our services
○ Scale our infrastructure when we need it
○ And more!

@Laura_Morillo
@laura_morillo
laura.morillovelarde@gmail.com
We are hiring at seedtag!

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Docker&kubernetes

1. @Laura_Morillo Docker & Kubernetes Simplifying developer’s life

2. @Laura_Morillo@Laura_Morillo ● Twitter: @laura_morillo ● GDG Madrid Organizer, WTM Lead ● Startup lover. ● Backend developer at Seedtag. ● Google Developer Expert (Cloud) ● +10 years working with different technologies.

3. @Laura_Morillo

4. @Laura_Morillo Node.js

5. @Laura_Morillo Node.js

6. @Laura_Morillo Docker OOP Simile Image Container Class Instance

7. @Laura_Morillo Dockerfile

8. @Laura_Morillo Dockerﬁle

9. @Laura_Morillo Dockerfile Docker Repository (images)

10. @Laura_Morillo Node.js Container for Staging Container for Production Dockerfile Docker Repository (images) (containers)

11. @Laura_Morillo Node.js Redis Loadbalancer Node.js Loadbalancer Node.js Redis Redis

12. @Laura_Morillo Pokemon Go traﬃc

13. @Laura_Morillo

14. @Laura_Morillo Kubernetes: cluster Cluster Node 1 (VM or physical machine) Node 2 (VM or physical machine) Node 3 (VM or physical machine)

15. @Laura_Morillo@Laura_Morillo Pods Node.js Redis ● Smallest unit ● Contains one or more containers ● Volumes for persistence ● Ephemeral entities ● One IP per pod ● You shouldn’t create them directly Volumes

16. @Laura_Morillo@Laura_Morillo Deployments ● Drive current state toward desired state V1 V1

17. @Laura_Morillo Deployments

18. @Laura_Morillo Deployments kubectl apply -f my-deployment.yaml

19. @Laura_Morillo Deployments Cluster Node 1 Node 2 Node 3

20. @Laura_Morillo Deployments Redis V1 My Image V1 Redis V1 My Image V1 Cluster Node 1 Node 2 Node 3

21. @Laura_Morillo Deployments Redis V1 My Image V1 Redis V1 My Image V1 Cluster Node 1 Node 2 Node 3

22. @Laura_Morillo@Laura_Morillo Services ● Deﬁnes a logical set of pods and a policy to access them Redis V1 My Image V1 Redis V1 My Image V1 Nginx V1 Service

23. @Laura_Morillo Services: ClusterIP

24. @Laura_Morillo Services: ClusterIP Redis V1 My Image V1 Redis V1 My Image V1 Cluster Node 1 Node 2 Nginx V1 my-node-app-service nginx-service

25. @Laura_Morillo Services: ClusterIP Redis V1 My Image V1 Redis V1 My Image V1 Cluster Node 1 Node 2 Nginx V1 Error! my-node-app-service nginx-service

26. @Laura_Morillo Services: LoadBalancer Public IP: Ej: 123.45.678.9

27. @Laura_Morillo Services: LoadBalancer Redis V1 My Image V1 Redis V1 My Image V1 Cluster Node 1 Node 2 Nginx V1 IP: 123.45.678.9 my-node-app-service nginx-service

28. @Laura_Morillo Changes????

29. @Laura_Morillo@Laura_Morillo Deployments ● Controls new versions ● Rollback to previous versions ● Update strategy V1 V2 Deployment

30. @Laura_Morillo Deployments: RollingUpdate

31. @Laura_Morillo Deployments: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1

32. @Laura_Morillo Deployments: RollingUpdate

33. @Laura_Morillo Deployment: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1

34. @Laura_Morillo Deployment: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1 Redis V1 My Image V2

35. @Laura_Morillo Deployment: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1 Redis V1 My Image V2

36. @Laura_Morillo Deployment: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1 Redis V1 My Image V2 Redis V1 My Image V2

37. @Laura_Morillo Deployment: RollingUpdate Redis V1 My Image V1 Redis V1 My Image V1 Redis V1 My Image V2 Redis V1 My Image V2

38. @Laura_Morillo Pokemon Go traﬃc

39. @Laura_Morillo@Laura_Morillo HorizontalPodAutoscaler ● Scales the number of pods from a deployment ● At the moment, only based on the CPU utilizationRedis V1 My Image V2 HorizontalPodAutoescaler: From 2 to 10 Redis V1 My Image V2 Min 2 Redis V1 My Image V2 Max 10 1 2 10

40. @Laura_Morillo HorizontalPodAutoscaler

41. @Laura_Morillo Summary ● Kubernetes is a cluster manager that helps us to: ○ Deploy our applications from Docker containers ○ Structure our application with microservices ○ Connect the diﬀerent microservices ○ Provide external access to our services ○ Scale our infrastructure when we need it ○ And more!

42. @Laura_Morillo @laura_morillo laura.morillovelarde@gmail.com We are hiring at seedtag!

Docker&kubernetes

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