jenishmoses – Best DevOps

What are the components of Kubernetes worker and explain each component’s function?

jenishmoses — Wed, 01 Sep 2021 07:26:00 +0000

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

2.What are the components of Kuberentes master and explain each component’s functions

jenishmoses — Wed, 01 Sep 2021 07:10:49 +0000

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

Write down 10 features of Kubernetes with image

jenishmoses — Wed, 01 Sep 2021 06:55:15 +0000

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

Q3. Write a example dockerfile with 2 CMD, 2 ENTRYPOINT and 1 CMD/1ENTRYPOINT and write down a behaviour of it.

jenishmoses — Tue, 31 Aug 2021 07:31:39 +0000

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

Create one Image which have base as centos and with git – ntp – httpd.

jenishmoses — Tue, 31 Aug 2021 05:47:51 +0000

root@ip-172-31-28-155:/home/ubuntu# docker commit -a”jenish” -m”jenish centos” b26fb2545c08 jenish_centos
sha256:bcbda5ee8c6a2c31ab6e86820c86585b033718f43d54ed17f8fd92aa46c72c3a

root@ip-172-31-28-155:/home/ubuntu# docker run -itd –name jenishCentos jenish_centos

Create one Image which have base as ubuntu and with git – ntp – apache2

jenishmoses — Tue, 31 Aug 2021 05:37:05 +0000

created an image

docker commit -a”jenish” -m”jenish” 1dc3e53e3e54 jenish_ubu

docker run -itd jenish_ubu

What is the use of “docker update” commands? with example and image

jenishmoses — Tue, 31 Aug 2021 02:31:42 +0000

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

What is the difference between docker pause and docker unpause ?

jenishmoses — Mon, 30 Aug 2021 08:41:53 +0000

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

To unpause is, use ” docker unpause “

Q2. What is the difference between docker stop and docker kill?

jenishmoses — Mon, 30 Aug 2021 08:21:55 +0000

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.

What is Docker Container with image?

jenishmoses — Mon, 30 Aug 2021 07:36:13 +0000

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