Debug School: Aditya Ranjan

k8s Assignment day-3

Aditya Ranjan — Wed, 19 Oct 2022 09:30:49 +0000

Pod usually acts as a wrapper around a single container or multiple containers, which represents either a single job or multiple jobs.
Characteristics of Pod:

Unique IP address.
simplified data sharing between containers.

Deployment is used to tell Kubernetes how to create or modify instances of the pods that hold a containerized application.
Features:

Scaling.
Rollout or Rollback.
Versioning.
Replica Controllers.

Service is a Network Loadbalancer.
Types:

External Load balancer like azure, AWS
Node port

K8S architecture and parts of master and worker nodes

Aditya Ranjan — Tue, 18 Oct 2022 06:36:00 +0000

K8S Architecture:
master is installed on one machine and workers on the rest machines. the master manages the multiple containers across the multiple nodes. In the worker nodes, there can be one or more pods and pods can contain one or more containers.

Components of master and their roles:

APIServer: Exposes the REST commands, after validation stores it in etcd.
Cluster Store: Storage which is used to store the cluster data.
Controller Manager: Controller manager executes the various types of controllers for handling the nodes, endpoints, etc.
Scheduler: schedules the tasks to the worker nodes.

Components of worker node and their roles:

Kubelet: It starts, stops, and maintains the containers which are in the pods. Reports back to the master.
KubeProxy: network routing and load balancing.
Container Engine: Container management.

Problems solved by K8S

Aditya Ranjan — Tue, 18 Oct 2022 04:43:29 +0000

Manage Containers at scale
It provides a layer of abstraction on our containers to create, start, stop, restart and manage those
automate the deployments
Share of storage among containers
automatic load balancing
replacing the failed components with the new one
self-repair of containers
easily portable
workload placement
highly available