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Deploying WSO2 Middleware on Kubernetes
This document discusses deploying WSO2 middleware on Kubernetes. It provides an overview of Kubernetes architecture and components, and how various Kubernetes features like pods, replication controllers, services, and overlay networking are used. It also describes WSO2 Docker images, Carbon reference architectures for Kubernetes, and the deployment workflow. Monitoring of Kubernetes cluster health using tools like cAdvisor, Heapster, Grafana and InfluxDB is also covered briefly.
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Deploying WSO2 Middleware on Kubernetes
- 1. Deploying WSO2 Middleware onKubernetes Imesh Gunaratne Senior Technical Lead, WSO2
- 2. Agenda ● PaaS Solutionsfor WSO2 Middleware ● Deploying WSO2 Middleware on Kubernetes ○ Kubernetes Architecture ○ Kubernetes Features Used ○ WSO2 Docker Images ○ WSO2 Carbon Reference Architectures for Kubernetes ○ Deployment Workflow ○ WSO2 Kubernetes Artifacts ○ Monitoring
- 3.
- 4. PaaS Solutions forWSO2 Middleware
- 5. Core PaaS FeaturesNeeded for a Production Deployment ● Auto healing ● Autoscaling ● Automatic cluster discovery ● Dynamic load balancing ● VM/Container support ● Multi-tenancy ● Configuration orchestration ● Artifact distribution ● Multi-region/cloud deployments ● Centralized logging ● Monitoring ● Metering
- 6. Deploying WSO2 Middleware onKubernetes
- 7. An Introduction toKubernetes ● An open source container cluster management system ● Started by Google with decade and half experience on running containers at scale (Borg) ● Written in Go ● Can be deployed on any Infrastructure/IaaS ● Over 600 contributors http://kubernetes.io/v1.0/docs/whatisk8s.html
- 8. Kubernetes High LevelArchitecture Node1 Node2 Node n Physical Network Master Overlay Network (Flannel/OpenVSwitch/Weave)APIServer Scheduler ControllerManager etcd
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- 10. Kubernetes Features usedby WSO2 Middleware ● Pods ● Replication Controllers (RC) ● Horizontal Pod Autoscalers (HPA) ● Services ● Ingress/Service Load Balancer ● Overlay Network ● Service Accounts & Secrets ● Namespaces
- 11. Kubernetes Pods ● Agroup of containers which can share resources and context ● Shared namespaces: ○ PID namespace (processes visible globally) ○ network namespace (same IP and port space) ○ IPC namespace (SystemV IPC or POSIX) ○ UTS namespace (share a hostname) http://kubernetes.io/v1.0/docs/user-guide/pods.html Pod C1 C2 C3
- 12. Kubernetes Replication Controllers ●Provides features for replicating pods: ○ Auto-healing ○ Manual scaling ○ Rolling updates ○ Multiple release tracks http://kubernetes.io/v1.0/docs/user-guide/replication-controller.html Pod Template Replicas = n Pod 1 Pod 2 Pod n Replication Controller
- 13. Kubernetes Horizontal PodAutoscaler ● Provides features for horizontally autoscaling pods ○ CPU consumption based ○ Currently in Alpha http://kubernetes.io/v1.1/docs/user-guide/horizontal-pod-autoscaler.html Pod Template Replicas = n Pod 1 Pod 2 Pod n Replication Controller Horizontal Pod Autoscaler
- 14. ● Service types: ○ClusterIP (default) ○ NodePort ○ LoadBalancer ● Service discovery: ○ DNS ○ Environment variables ● Client IP based Session Affinity http://kubernetes.io/v1.0/docs/user-guide/services.html Kubernetes Services Node IP: 172.17.8.102 Port: 9443 Domain Name: service1 IP: 10.2.10.20 Port: 9443 NodePort: 32001 Protocol: TCP Pod 1 Pod 2 Pod n Service L1 L1 L1 L1 Node
- 15. ● Unique IPaddresses ● Provides pod to pod networking ● Options available: ○ Flannel (default) ○ OpenVSwitch ○ Weave ○ Calico http://kubernetes.io/v1.1/docs/admin/networking.html Kubernetes Overlay Network
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- 17. WSO2 Carbon ReferenceArchitecture 1 Pod 1 Pod 2 Manager Cluster Services Pod 3 Pod 4 Pod n Worker Cluster Services Manager Replication Controller Worker Replication Controller Client Gov Reg Conf Reg User Store
- 18. WSO2 Carbon ReferenceArchitecture 2 Pod 1 Gateway Mgr Services Pod 2 Pod 3 Gateway Worker Services Client Pod 4 Pod 5 Key Manager Services Pod 6 Pod 7 Store Services Gateway Mgr RC Gateway Worker RC Key Manager RC Store RCGov Reg Conf Reg User Store API-M DB A volume mount for synchronizing API artifacts Pod 8 Pod 9 Publisher Services Publisher RC
- 19. Carbon Cluster Discoveryon Kubernetes Pod 1 Pod 2 Pod n Service Server 1 Server 2 Server n Pod 1 Service Server 1 Pod 1 Pod 2 Service Server 1 Server 2 Hazelcast member initialization Hazelcast member initialization Hazelcast member initialization 1 2 n
- 20. Deployment Workflow 3 1 2 BuildDocker Image Import Docker Image to Docker Registry Application Artifacts Kubernetes Membership Scheme Product Distribution Docker Image (DI) Puppet Module + Hiera Files JDK Deploy Kubernetes Artifacts Kubernetes Artifacts
- 21. WSO2 Kubernetes Artifacts ●WSO2 Kubernetes Artifacts Git Repository ○ Kubernetes Membership Scheme ○ Kubernetes Services ○ Kubernetes Replication Controllers https://github.com/wso2/kubernetes-artifacts
- 22.
- 23. Monitoring Kubernetes Cluster/Node/Pod Health cAdvisorcAdvisor Node1 cAdvisor Heapster Node 2 Node n Grafana InfluxDB
- 24.