Intro to Kubernetes Workshop — Innovation Labs July 2020
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The document outlines a Kubernetes workshop led by Andrei Petrescu, head of DevOps at CloudHero, focusing on Kubernetes architecture, API communication, and application building blocks. It covers essential components like pods, deployments, services, config maps, and secrets, emphasizing their roles in application management and scaling. The workshop provides practical instructions for setup and interaction with Kubernetes through commands and configurations.
Intro to Kubernetes Workshop — Innovation Labs July 2020
- 2. About Me (Andrei Petrescu) - Head of DevOps @ CloudHero - Experience with Kubernetes in production - ACS Graduate - Teaching Assistant at Local Networks - E-mail: andrei.petrescu@cloudhero.io
- 3. CloudHero Unlocking the full potential of Kubernetes and Cloud Native technologies We help companies deliver better software and scale faster through DevOps, Kubernetes and Cloud Computing.
- 4. Agenda - Kubernetes Architecture - Communicating with the API - Application Building Blocks
- 5. High Level Architecture - etcd cluster stores state - The Master node is the control plane - The Worker node runs the containers
- 6. Control Plane Components - Controllers - Scheduler - Kubernetes API - Kubelet
- 7. Networking
- 8. How do we communicate with the Kubernetes API?
- 9. Kubectl - Imperative vs Declarative - Pros and cons?
- 11. Download the Workshop - vagrant ssh - git clone https://github.com/cloud-hero/kubernetes-workshop.git - cd kubernetes-workshop
- 12. Pod - Wrapper over containers - Can have more than one container - Communication over 127.0.0.1 - Example: Nginx + PHP-FPM
- 13. Pod
- 14. Deployment - Wrapper over pods - Provides fault tolerance - Controls the number of pod replicas
- 15. Deployment
- 16. Deployment
- 17. Deployment - Each pod has its own IP address - Pods are ephemeral - How do we reach all of them from another application?
- 18. Service - Creates a Virtual IP to balance traffic to the application pods - Creates a DNS entry inside Kubernetes for the pods (<svc_name>.<namespace>.svc.cluster.local) - Kube-proxy
- 19. Service
- 20. Service
- 21. Service
- 22. Service
- 23. ConfigMap - Provides decoupling of configuration and application code - Can also store environment variables
- 24. ConfigMap
- 25. ConfigMap
- 26. ConfigMap - Testing by entering into the container
- 27. Secret - Stores sensitive data - Can either be environment variables or files - Can be encrypted before being stored in etcd
- 28. Secret
- 29. Secret
- 31. That’s all!