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Introduction kubernetes 2017_12_24
- 1. An Introduction toKubernetes and CNI
- 2. About Me • 鄭偉聖,SAM • CS student in NCTU • Intern in National Center for High-performance Computing(NCHC) • Intern in Industrial Technology Research Institute (ITRI) • Familiar with OpenStack, Docker, Kubernetes • Golang and Python • Email: kweisamx.cs05g@g2.nctu.edu.tw • GitHub: github.com/kweisamx
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- 4. 4 Why we needKubernetes ?
- 5. Why we needKubernetes ?
- 6. Agenda Introduction Kubernetes Architecture How tobuild Kubernetes cluster Application Conclusion & QA
- 7. Introduction to Kubernetes 100% opensource, written by Golang Platform for automating, deployment, and operation Inspired and informed by Google’s experiences and “Borg” The name is mean ”helmsman” and “pliot” Aka k8s , replace “ubernete” with 8
- 8. Architecture Master-Slave Masterused to controller the cluster and offer API Node mostly run the container to offer service
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- 10. Kubernetes Master Etcd:Use to store the cluster status ApiServer: Use Restful Api to get informati on or post request with json Controller Manager Server: Controller the cluster Schedular: schedule resource for container
- 11. Kubernetes Node Kubelet:connect with apiserver, handle d ata, volumn, image, status for container Kube-proxy: handle the service routing, an d support Load Balance
- 12. A Groupof co-located containers(one or more) Shared the same value and network namespace/ip port Restart pofile Healthy Templates(yaml) 12 Pod
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- 15. Arbitrary metadata The connect with Replication controller and pods key/value pairs identify a set of objects via a label selector 15 Label
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- 17. • Ensures thata specified number of pod “replicas” running at any time • Flexible scale • Auto change the replica • Rolling Update Replica Set
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- 23. • We createthe pod , which pod of label is test:rc • And then we change the pod’s labels from rc to rc2 • Because kubernetes get the information that no pod label is “rc”, so it create the new one 23 Replica Set
- 24. • And wedelete the pod • Yes, the pod is different, that because the ReplicationController keep number is 1 of the pod which label is “rc” 24 Replica Set
- 25. • And wecan also change the number of replica • Ofcourse, you can shrink the number of replica 25 Replica Set
- 26. • Use bydeployment and ReplicationController • Update period • Reverse the version(if you need) Rolling Update ServiceService
- 27. • Kubernetes recommandus use deployment to build our container cluster • All feature of replica set • Provides declarative updates for Pods and Replica Sets • More Powerful Deployment
- 28. • Test: rollingupdate – Set Image – Replace • Change the yaml to update by use <kubectl replace –f > – Edit • Kubectl edit deploment <your deploment> Deploment
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- 31. • Defines alogical set of Pods and a policy by which to access them. • A service rule defines a TCP or UDP port reservation • Provides a way for applications running in containers to connect • Use labels • Clutser IP 31 Service
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- 34. How to BuildKubernetes? Kubeadm : quickly, easy , but not recommended to build production cluster, master don’t have high availability Kubespray: Use with Ansible, and support many add-on, can build for production, but recommend to familiar with Ansible Kops: Use in Cloud like AWS , GCP, easy to build your cluster Bootkube: Now in kubernetes-incubator, can be used to generate all of the necessary assets for use in bootstrapping a new cluster Kubernetes the Hard Way: The most hard way to bulid, but you can learn much of kubernets
- 35. • The simpleinterface between container runtime and network implement • Originated at CoreOS as part Rkt • CNCF project Container Network Interface
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Editor's Notes
- #32 什麼是存取規則 就是如何存取該服務的規則，比方說 TCP/UDP、Port 等等相關規則。