Container Its a the application/env we need to managed by K8s Kubelet  kubelet is responsible for starting, stopping the containers in pods, Ensure the stable running in the desired state Runs the Kubernetes nodes Kube-proxy service for network proxy makes communications between pods, containers, and nodes

API Server Its process the incoming API request from UI/CLI It Uses RESTAPI Controller Controls the Kubernetes cluster Kubernetes include the Endpoints Controller, Replication Controller, and Namespace Controller observes the state of the cluster scheduler Schedules Pods Scheduler maintains the work Cluser store permanent storage for Cluster config

Managing contianers Automatic Scalling Up or down Maintain pods Configuration done by Yaml or Json Manage Mulitple Contianers Always maintain desired Containers Automatic creations of failed contianers

Sceraniro 1 2 CMD – the last CMD will override the first one Scenario 2 2 EntryPoint – the last ENTRYPOINT will override the first one Scenario 3 1 ENTRYPOINT and 1CMD – Entrypoint will override CMD

root@ip-172-31-28-155:/home/ubuntu# docker commit -a”jenish” -m”jenish centos” b26fb2545c08 jenish_centossha256:bcbda5ee8c6a2c31ab6e86820c86585b033718f43d54ed17f8fd92aa46c72c3a root@ip-172-31-28-155:/home/ubuntu# docker run -itd –name jenishCentos jenish_centos

created an image docker commit -a”jenish” -m”jenish” 1dc3e53e3e54 jenish_ubu docker run -itd jenish_ubu

The docker update command dynamically updates container resources. we can use theses command to configure the containers CPU usage, memory and restart setups $ docker update –cpu-shares 512 abebf7571666

If we want to pause the processes running inside the container, we can use the “docker pause” command. To unpause is, use ” docker unpause “

Docker Stop – allows the docker contianer to terminate the process gracefully. This will also internally call KILL method if the STOP methods didnot respond with in limited time period Docker Kill – will terminate the docker container abruptly.It will leads to Forcible exist.

Docker image is a snapshot which contians our code and dependent files. Docker containier is a instance of a doceker image, we can have mulitple contianers for a docker Imager