How to install and use Kubernetes
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This document serves as a guide on how to install and use Kubernetes, presenting its core components including pods, deployments, and services. It outlines the functionalities provided by Weave to enhance DevOps processes, such as observability and continuous delivery. Additionally, it discusses Kubernetes architecture, service discovery, and the next steps for integrating CI/CD pipelines and monitoring strategies.
How to install and use Kubernetes
- 1. How to install and use Kubernetes Luke Marsden, Developer Experience @lmarsden
- 2. What does Weave do? Weave helps devops iterate faster with: • observability & monitoring • continuous delivery • container networks & firewalls Kubernetes is our #1 platform
- 3. Agenda 1. Concepts 2. Containers, Pods, Deployments, Services 3. Installing Kubernetes 4. Demos of Pods, Deployments, Services 5. Microservices sample app 6. What’s next?
- 4. Kubernetes: all you need to know Pods containers Services Deployments
- 10. web Concepts Podnginx apiVersion: v1 kind: Pod metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 Node
- 11. Recap: all you need to know Pods containers Container Image Docker container image, contains your application code in an isolated environment. Pod A set of containers, sharing network namespace and local volumes, co-scheduled on one machine. Mortal. Has pod IP. Has labels.
- 12. Motivation for Deployments Node 1 Pod web nginx Node 2
- 13. Motivation for Deployments Pod web nginx Node 1 Node 2
- 14. Motivation for Deployments Pod web nginx Node 1 Node 2
- 15. Deployment web nginx apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx-deployment spec: replicas: 1 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 Node 1
- 16. Deployment web nginx apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx-deployment spec: replicas: 1 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 Node 1
- 20. Deployment web nginx apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx-deployment spec: replicas: 1 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 Node 1
- 21. Deployment web nginx apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx-deployment spec: replicas: 2 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 Node 1
- 23. Recap: all you need to know Pods containers Deployments Container Image Docker container image, contains your application code in an isolated environment. Pod A set of containers, sharing network namespace and local volumes, co-scheduled on one machine. Mortal. Has pod IP. Has labels. Deployment Specify how many replicas of a pod should run in a cluster. Then ensures that many are running across the cluster.
- 24. Service discovery • Kubernetes provides DNS for service discovery
- 25. Service discovery • Kubernetes provides DNS for service discovery WAIT! You said “service”. What is a service?
- 26. Services: ClusterIP (internal things) Computer 1 web ruby Computer 2 10.0.0.1 db pgsql 10.0.0.2 service VIP 10.1.0.1DNS lookup “db” returns A 10.1.0.1
- 27. Services: ClusterIP (internal things) Computer 1 web ruby Computer 2 10.0.0.1 db pgsql 10.0.0.2 service VIP 10.1.0.1
- 28. Services: NodePort (external) Computer 1 web nginx web nginx 10.0.0.1 10.0.0.2 81.23.64.18 81.23.64.19 requests requests Computer 2
- 29. Computer 1 web nginx web nginx 10.0.0.1 10.0.0.2 81.23.64.18 81.23.64.19 requests requests Computer 2 Services: NodePort (external) NodePort 30001 service VIP 10.1.0.1 NodePort 30001 service VIP 10.1.0.1
- 30. Computer 1 web nginx web nginx 10.0.0.1 10.0.0.2 81.23.64.18 81.23.64.19 requests requests Computer 2 Services: NodePort (external) NodePort 30001 service VIP 10.1.0.1 NodePort 30001 service VIP 10.1.0.1
- 31. kind: Deployment metadata: name: nginx-deployment spec: replicas: 2 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 kind: Service metadata: name: frontend spec: type: NodePort selector: app: nginx ports: - port: 80 targetPort: 80 nodePort: 30002 Using selectors How do services connect to deployments? matches
- 32. kind: Deployment metadata: name: nginx-deployment spec: replicas: 2 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 kind: Service metadata: name: frontend spec: type: NodePort selector: app: nginx ports: - port: 80 targetPort: 80 nodePort: 30002 How do you expose services to outside? Using NodePort
- 33. Recap: all you need to know Pods containers ServicesDeployments Container Image Docker container image, contains your application code in an isolated environment. Pod A set of containers, sharing network namespace and local volumes, co-scheduled on one machine. Mortal. Has pod IP. Has labels. Deployment Specify how many replicas of a pod should run in a cluster. Then ensures that many are running across the cluster. Has labels. Service Names things in DNS. Gets virtual IP. Two types: ClusterIP for internal services, NodePort for publishing to outside. Routes based on labels.
- 34. Architecture of Kubernetes itself Node 1 Node 2 Master
- 35. API server Architecture of Kubernetes itself Node 1 Node 2 Master API server etcd kubeadm init
- 36. API server Architecture of Kubernetes itself Node 1 Node 2 Master API server etcd kubeadm init kubeadm join kubelet
- 37. API server Architecture of Kubernetes itself Node 1 Node 2 Master API server etcd kubeadm init kubeadm join kubeadm join kubelet kubelet
- 38. API server Architecture of Kubernetes itself Node 1 Node 2 Master API server etcd kubeadm init kubeadm join kubeadm join kubelet kubelet kubectl apply
- 39. API server Architecture of Kubernetes itself Node 1 Node 2 Master containers Services containers API server etcd kubeadm init kubeadm join kubeadm join kubectl apply kubelet kubelet
- 40. Training!
- 41. Join the Weave user group! meetup.com/pro/Weave/ weave.works/help
- 42. What’s next? • Continuous delivery: hooking up my CI/CD pipeline to Kubernetes • How do I monitor this stuff? • Network policy for security Come to our Weave Cloud training to find out!
- 43. Thanks! Questions? We are hiring! DX in San Francisco Engineers in London & SF weave.works/weave-company/hiring