Continuous delivery of microservices with kubernetes - Quintor 27-2-2017
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Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications. It groups containers that make up an application into logical units for easy management and discovery. Kubernetes can deploy containerized applications as microservices and provide mechanisms to update them without downtime using techniques like rolling updates. It also provides tools for service discovery, load balancing, storage orchestration, auto-scaling, self-healing, and more.
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Continuous delivery of microservices with kubernetes - Quintor 27-2-2017
- 1. Continuous Delivery of Micro services with Kubernetes 27-2-2017 – Quintor
- 2. Bedankt voor jullie aandacht “Once you stop learning, you start dying” - Albert Einstein ARJEN WASSINK Principal Consultant a.wassink@quintor.nl @ArjenWassink
- 3. The Menu 1. Intro Microservices 2. Intro Docker 3. Kubernetes 4. Rolling updates 5. Persisted volumes 6. Stateful services
- 4. Martin Fowler on Microservices: In short, the microservice architectural style [1] is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.
- 5. Microservices: Scaling is important https://www.nginx.com/blog/introduction-to-microservices/
- 6. Microservices: advantages ● The services themselves are very simple, focussing on doing one thing well; ● Each service can be built using the best and most appropriate tool for the job; ● Systems built in this way are inherently loosely coupled; ● Multiple developers and teams can deliver relatively independently of each other under this model; ● They are a great enabler for continuous delivery, allowing frequent releases whilst keeping the rest of the system available and stable.
- 7. Microservices: drawbacks ● Diverse technology stack ● Complex distributed systems ● More software projects to manage ● Reliability and performance ● Exponentially more service instances to manage
- 9. http://www.zdnet.com/article/what-is-docker-and-why-is-it-so-darn-popular/ Virtual Machines vs. Containers
- 12. Microservices: drawbacks ● Diverse technology stack ○ Containerization freedom of technology choice ○ Uniform way of distributing and running apps ● Complex distributed systems ● More software projects to manage ● Reliability and performance ● Exponentially more service instances to manage
- 13. Docker at scale with Kubernetes
- 14. Everything at Google runs in containers Launch over 2 billion containers per week.
- 15. Enter Kubernetes Greek for “Helmsman”; also the root of the word “Governor” • Container orchestrator • Runs containers • Supports multiple cloud and bare-metal environments • Inspired and informed by Google’s experiences and internal systems • Open source, written in Go Manage applications, not machines
- 16. web browsers Scheduler kubectl web browsers scheduler Kubelet Kubelet Kubelet Kubelet Config file Kubernetes Master Container Image Developer View What just happened?
- 17. Pods, Replication sets & scaling Pod con- tainer con- tainer Deployment Replication Set Pod con- tainer con- tainer Pod con- tainer con- tainer
- 19. Worker Node 192.168.178.200 10.1.2.0/24 Worker Node 192.168.178.100 10.1.1.0/24 Cluster networking Pod 10.1.1.21 Pod 10.1.1.22 Pod 10.1.1.20 Pod 10.1.2.31 Pod 10.1.2.32 Pod 10.1.2.30
- 20. Services Pod con- tainer con- tainer Service Cluster IP:port <10.0.0.20:80> Node IP:port <10.150.42.191:88> Pod con- tainer con- tainer Pod con- tainer con- tainer Loadbalancer Kube Proxy (IP Tables) API server Watches
- 21. Worker Node Persistent Storage Node Persistent Volumes Pod con- tainer con- tainer Persisted Volume Persisted Volume Claim Persisted Volume Mount
- 23. Microservices: drawbacks ● Diverse technology stack ● Complex distributed systems ○ Service discovery helps ● More software projects to manage ● Reliability and performance ○ Manages availability actively ● Exponentially more service instances to manage ○ Manage instances from code
- 24. Stateful Set Pod-1 con- tainer con- tainer Statefull Set Pod-0 con- tainer con- tainer Pod-2 con- tainer con- tainer Service
- 25. Quintor Deploying without downtime • Rolling updates • Rollback • Readiness Probes
- 26. Worker Node Namespaces PodDeployment Pod Service PodDeployment Pod Service Worker Node
- 27. Kubernetes - Centralized Logging
- 28. Kubernetes - Centralized Monitoring
- 30. Microservices: drawbacks ● Diverse technology stack ● Complex distributed systems ● More software projects to manage ○ Namespaces enables multiple projects ● Reliability and performance ○ Stateful Sets enables persistence clusters ○ Active health monitoring and resource limiting ● Exponentially more service instances to manage ○ Centralized monitoring and logging
- 31. Quintor Resources • Docker - Build, Ship, and Run Any App, Anywhere – www.docker.com • Kubernetes - Accelerate Your Delivery – kubernetes.io • Creating a Raspberry Pi cluster running Kubernetes – tinyurl.com/rpi-k8s-cluster @ArjenWassink