aws&Devops Interview questions and answers

1.How to mount unmount a disk ?

First we can check disk partition fdisk -l or lsblk

* we can create a directory where we want mount

sudo mkdir /mnt/mydisk

*we can use mount command to mount the disk

sudo mount /dev/sdXn /mnt/mydisk

*To unmount disk

sudo umount /mnt/mydisk

2. How to unlock the username?

*If a user account is locked due to multiple failed login attempts

Then we can use below command

sudo passwd -u username

3.How to set user to NO LOGIN

*If we don't require interactive logins.

Then we can use below command

sudo usermod --shell /usr/sbin/nologin username

The usermod command can be used to modify user account properties

4.what are the process states in linux

The Linux process states are many

*Running (R). : we are executing instructions on CPU

*Sleeping(S) : Sleeping processes are not using CPU resources

* Stopped (T). : A stopped process can be resumed or terminated.

*Zombie (Z): : In an operating system ,processes that are terminated but , for some reason must have its task structure in the process table are referred as

Zombie.(or) The child process completes execution, but the parent keeps executing, then the child process is known as Zombie.

*Dead (D): The process has been terminated,Dead processes are waiting for their parent to acknowledge their termination.

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How to copy files from one server to another server by using ansible copy module

We have two servers 1.master 2.worker1 create playbook example: play.yml --- - hosts: all tasks: - name: Ansible copy file to remote server copy: src: ~/kube-cluster dest: /root Run ansible playbook ansible-playbook play.yml

shell scripting and important linux questions and answers

1.echo $0 what it means? It will show the name of the currently running process Example: prepare test.sh #!/bin/bash echo $0 Then run test.sh after giving permission to chmod 700 test.sh root@ip-172-31-15-196:~# chmod 700 test.sh root@ip-172-31-15-196:~# ./test.sh ./test.sh 2.How to create 100 empty files at a time? touch file-{001..100} 3.What is hardlink and softlink and how it will be work and what is the difference between them? Hard link: 1.If we delete original file our data will be available 2.Inode number of both original file and hard link file both are same 3.Hard links are fast . Soft link: 1.If we delete original file our data will not be available 2.inode of original file and soft link file are different 3.Soft links are slower. 4.soft links can be used for linking directories 5.soft links will work across file systems. 6.File permissions are different. Creating sof link creating a file1.txt [root@ip-172-31-43-210 linux]# echo "ashwika tech" >> file1.

Kubernetes interview questions and answers

1.H ow to setup kubernetes dashboard on ubuntu16.04 cluster? To create kubernetes dashboard follow below link https://docs.aws.amazon.com/eks/latest/userguide/dashboard-tutorial.html To deploy the Metrics Server kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml kubectl get deployment metrics-server -n kube-system Deploy the dashboard kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml root@ip-172-31-43-76:~# kubectl get svc -n kubernetes-dashboard NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE dashboard-metrics-scraper ClusterIP 10.102.6.123 <none> 8000/TCP 120m kubernetes-dashboard NodePort 10.99.44.152 <none> 443:32508/TCP 120m Here a seperate service number was allocated 32508 Finally you can check on browser with your master or worker public ip with portn

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