Debug School: Agrima Sharma

What is POD, write a 10 lines explaination on POD by Agrima

Agrima Sharma — Thu, 20 Oct 2022 06:58:16 +0000

Pod is a small atomic unit that kubernetes instantiate.
It is the unit of scheduling.
It is a group of one or more containers, with shared resources.
All the pods are part of the pod network.
Each node can communicate with each other with the use of proxy.
All containers in a pod share the same ip of the parent pod.
Each pod has an IP and each container inside a pod has a port address, to access a container the following format has to be used : IP_address_of_pod : port_number_of_conatiner.
If a pod fails, it cannot be redeployed. A pod can only be created.
Stages of a pod are : Pending, running, success/failed.
Kuberentes has the job of keeping the pod running, and keeping it in the desired state.

Agrima Sharma — Thu, 20 Oct 2022 06:46:49 +0000

There are main two components - Master node or Control Plane
and worker node

Master node or Control plane has following components :

API server : It is the front end for the Kubernetes control plane and controls the communication from end user.
Cluster store : Keeps a store of the data which makes it persistent.
Scheduler : It keeps a track of newly created Pods and selects a node for them to run on.
Controller manager : It controls the worker nodes and manages them.

Node components consists of the following components :

kubelet : It is an agent that runs on each node in a cluster. It makes sure that containers are running in a Pod.
kubeproxy : It is a network proxy that runs on each node in your cluster
Pods : It contains the container images.

Agrima Sharma — Thu, 20 Oct 2022 06:34:29 +0000

Agrima Sharma — Thu, 20 Oct 2022 06:31:56 +0000

It is an open-source management tool used for scaling, deploying and managing containers.
It automates these processes and is known as k8s