Rahulkrishnan R A @rahulkrishnanra Building block of Kubernetes Chennai Kubernetes 

- Containers are normal process - Process executed using two Linux kernel features - Cgroups - Namespace Containers Virtual Machines How containers looks like? 

Orchestration - Kubernetes • Horizontal scaling • Self-healing • Automated rollouts and rollbacks • Secret and configuration management • Automatic Binpacking • Batch execution 

Pod in kubernetes POD PODS – grouping containers App 1 App 2 App 3 

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 

Nginx v1 Mount Hostname PID Network IPC Nginx v2 Mount Hostname PID Network IPC Container 1 Container 2 Isolation using namespace Isolated Containers 

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nginx Hostname PID Network IPC cache localhost Pod with multiple containers 

How POD looks like? Namespaces - Net - IPC …… Label 1 Label 2 Label 3 Pause Container Init Container Post Start Pre Stop Main Readiness Liveness 

Usecase of POD 

How to create pod? 1) kubectl run --image= --port= Eg: $kubectl run nginx –image=nginx:latest –port=80 2) Using Manifest file kubectl create – f Eg: kubectl create –f pod.yaml Note : Always create POD with the help of controllers 

Manifest file 

Demo Time 

POD is the Building block of Kubernetes 

@rahulkrishnanra Thank you https://www.meetup.com/Chennai-Kubernetes @k8schennai k8schennai.slack.com