Infrastructure Management Using Kubernetes

Managing Infrastructure using Kubernetes. A brief introduction about Kubernetes, containers and their differences from standard virtualization

Transcript

1. Infrastructure Management Using Kubernetes Dr. Omer Dawelbeit | @omerio | +OmerDawelbeit Annual Day 2017 Slides: https://goo.gl/HGgX5V
2. About me ‘omerio’ • Co-founder GDG Reading, UK. 2015 - 2016 • Co organizer GDG Cloud Emirates, UAE. 2017 - Now • Google Developer Expert (Cloud) • Open Source contributor (ecarf.io, cloudex.io) Google • 16+ years as Tech Consultant (UK, Middle East & South East Asia) • PhD Computer Science, University of Reading (Cloud + Big Data) • Blog at omerio.com, Tweets @omerio Reading, UK Dubai, UAE
3. Content • What is Kubernetes? • What is a container? • Virtualization Overview • Where can I run it? • What can Kubernetes do and why use it? • Kubernets Cluster Overview
4. Kubernetes & Containers
5. What is Kubernetes? Greek for “Helmsman”; also the root of the words “governor” and “cybernetic” • An Open Source system that runs and manages containers • Inspired and informed by Google’s experiences and internal systems • Supports multiple cloud and bare-metal environments • Supports multiple container runtimes (Docker, Rocket) • 100% Open source, written in Go Manage applications, not machines
6. What is a container? • Lightweight environment • Static application environment • No external dependencies • Application isolation • Reusable, runnable artifacts • Loosely coupled • Portable Run containers on bare metal already: https://www.youtube.com/watch?v=coFIEH3vXPw
7. Virtualization Overview Live migration
8. Virtual Infrastructure
9. Containers vs. VMs Typical VMs Containers on bare metal Containers on VMs
10. Containers Orchestration
11. Where can I run it? Laptop to high-availability multi-node cluster Hosted or self managed On-Premise or Cloud (GCP, AWS, Azure, Bluemix, ..) Bare Metal or Virtual Machines Most OSes (inc. RedHat Atomic, Fedora, CentOS) Or just a bunch of Raspberry PIs Many options, See Matrix for details Kubernetes Cluster Matrix: http://bit.ly/1MmhpMW
12. What can Kubernetes do and why use it? • co-locating helper processes, • mounting storage systems (volumes), • application health checking, • replicating application instances, • horizontal auto-scaling, • load balancing, • rolling updates, • and resource monitoring. • manage applications, not machines, • better resource utilisation and scheduling, • better application performance monitoring (APM), • consolidated logging and reporting, • ease of deployment management, Source: Google
13. Cluster Overview • Pods • Containers • Labels • Replication Controllers* • Services • Nodes • Kubernetes Master http://omerio.com/2015/12/18/learn-the-kubernetes-key-concepts-in-10-minutes/ A Deployment that configures a ReplicaSet is now the recommended way to set up replication
14. Pods • Smallest deployable unit • Scheduled to nodes • Hosts containers and volumes • Ephemeral • Each has its own routable IP (no NAT) • Containers in a pod ◦ Tightly coupled ◦ Share IP, port and IPC namespaces ◦ Talk to each other through localhost http://blog.kubernetes.io/2015/06/the-distributed-system-toolkit-patterns.html
15. Pods Questions • How to persist data across container restarts? • How to create multiple copies of a Pod? • How can containers reference each other reliably?
16. Labels • Key/value pairs (tier=frontend, app=myapp) • Metadata with semantic meaning • Membership identifier (services & rc) • Queryable by Selectors (grouping)
17. Replication Controllers / ReplicaSet • Keeps Pods running • Ensures N copies of Pods are running • Provides direct control of Pods • Uses a Pod template • Determines constituent Pods using Label Selector
18. Replication Controllers
19. Services • An abstraction • Logical grouping of Pods • Determines constituent Pods using Label Selector • Load balancing between constituent Pods • Gets a stable virtual IP, port & DNS name
20. Services
21. A few more... • Volumes • Secrets • Namespaces • Resource based scheduling ... spec: containers: - name: locust image: gcr.io/rabbit-skateboard/guestbook:gdg-rtv resources: requests: memory: "300Mi" cpu: "300m" limits: memory: "300Mi" cpu: "300m"
22. Kubernetes is Open Source We want your help! http://kubernetes.io https://github.com/kubernetes/kubernetes Slack: #kubernetes-users @kubernetesio
23. Thank you Stay in touch Google+: +OmerDawelbeit Twitter: @omerio LinkedIn: OmerDawelbeit Blog: omerio.com Slides: https://goo.gl/HGgX5V