Building Block of Kubernetes

Chennai Kubernetes Meetup #1

This talk was about how the POD looks like and why we need to use the POD concept in Kubernetes

Transcript

1. Rahulkrishnan R A @rahulkrishnanra Building block of Kubernetes Chennai Kubernetes
2. - Containers are normal process - Process executed using two Linux kernel features - Cgroups - Namespace Containers Virtual Machines How containers looks like?
3. Orchestration - Kubernetes • Horizontal scaling • Self-healing • Automated rollouts and rollbacks • Secret and configuration management • Automatic Binpacking • Batch execution
4. Pod in kubernetes POD PODS – grouping containers App 1 App 2 App 3
5. Kubernetes Architecture Worker Node 1 Master Node CLI UI API Kubelet Kube-proxy Worker Node 2 Kubelet Kube-proxy Worker Node 3 Kubelet Kube-proxy Controller Manager Scheduler etcd
6. Nginx v1 Mount Hostname PID Network IPC Nginx v2 Mount Hostname PID Network IPC Container 1 Container 2 Isolation using namespace Isolated Containers
8. nginx Hostname PID Network IPC cache localhost Pod with multiple containers
9. How POD looks like? Namespaces - Net - IPC …… Label 1 Label 2 Label 3 Pause Container Init Container Post Start Pre Stop Main Readiness Liveness
10. Usecase of POD
11. How to create pod? 1) kubectl run <name> --image=<Image name> --port=<port no to be exposed> Eg: $kubectl run nginx –image=nginx:latest –port=80 2) Using Manifest file kubectl create – f <pod definition file path > Eg: kubectl create –f pod.yaml Note : Always create POD with the help of controllers
12. Manifest file
13. Demo Time
14. POD is the Building block of Kubernetes
15. @rahulkrishnanra Thank you https://www.meetup.com/Chennai-Kubernetes @k8schennai k8schennai.slack.com