DevOps interview questions

 My student infosys interview Questions

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Qstns I faced in infosys interview:

Technical:

1. Explain your roles and responsibilities.

2. Explain the stages in ur project declarative pipeline.

3. What is devops?

4. What is ci/cd?

5. What is difference in DevOps and CICD?

6. What are the git commands you use?

7. Difference in git fetch and git pull?

8. What is default port of Jenkins?

9. How to change Jenkins port no?

10. How to connect master slave?

11. How to checkout git code in Jenkins?

12. How to take backup of ur jenkins?

13. Do you have any script to launch slave nodes?

14. How do you resolve build failure?

15. Difference in soft link and hard link?

16. How to find a particular word from a file?

17. What is stop command?

18. What is Terraform provisioner?

19. What is Terraform module?

20. Is it possible to lock Terraform module?

21. What is AWS vpc?

22. How do you select availability zones using Terraform?

23. What is difference in S3 and other AWS storages?

24. How do you use S3 bucket in your project?

25. What is Terraform provider versioning?

26. How do you run docker container?

27. What is ansible playbook?

28. Syntax of ansible playbook

29. How u run ansible playbook?

30. Have you worked with any alerting monitoring tools?

Managerial:

1. Tell me about yourself

2. What are your daily routine as DevOps

3. What is ur team size

4. How scrum call happens

5. Do you take part in requirement gathering

6. Do you take calls with onshore and client?

7. Reason for change?

8. What is production issue u faced?

9. What was the exact reason?

10. How did you fix?

11. Do you write documentation

12. What other activities u do in ur project?

13. Who decides the server specification?

14. How u provision server?

15. Are you open to working in shifts?

DevOps interview qu

 Hi Guys,

Recently my student faced DevOps  interview questions.

Like this page for more interesting interview questions and free webinar some realtime hands on videos.

1. How to build kubernetes cluster?

2. What is POD?

3. What is the database of Kubernetes?

4. How to get the POD details?

5. What is docker file & contents ?

6. How Docker container created ?

7. What is the process to create container from image?

8. Write a recent used ansible playbook?

9. Syntax of writing multiple files ?

10. Command to encrypt yaml files ?

11. How to execute the playbook?

12. If hostnames need to create with playbook for multiple servers then give syntax?

13. Daily routine job?

14. Apart from production, what other environments you worked?

15. How to configure webhooks ?

16. What is the role of nodes in Jenkins?

17. How to write pipeline code to get a code from different server?

18. What is the role of Sonarqube?

19. How to integrate the Git with Jenkins?

Linux Interview questions:

 

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1. script/command to delete last word from every line in a file

 awk '{gsub("[a-zA-Z0-9]*$", "");print}'  <filename>

 To replace last word with hello in every line

awk '{gsub("[a-zA-Z0-9]*", "hello");print}'  <filename>

2.script/command to find the files with more than 1gb size

find <path for directory> -size +1G -type f

3. What is Swap Space?

4.  What is the maximum length for a file name in Linux?

5.Which partition stores the system configuration files in Linux system?

6. Which command is used to uncompress gzip files?

7. What is the difference between soft and hard mounting points?

8. What are the file permissions in Linux?

9.  more questions are from sed, find and awk .

10. How to check Memory stats and CPU stats as a Linux admin?

11.How to reduce or shrink the size of LVM partition?

12. How can you enhance the security of password file?

13. What is the difference between Cron and Anacron?

14. What command is used to check the number of files, disk space and each user’s defined quota?

15. how can you manage memory in linux machines?

16. 18. What is the name and path of the main system log?

17. how to manage logical volumes?

18. Explain /proc filesystem?

19. What are the fields in the/etc/passwd file?

20.  How do you terminate an ongoing process?

21. How can you know the execution time of a command?

22. How can you append one file to another in  Linux?

23. How you can run an Linux program in the background simultaneously when you start your Linux Server?

Devops Engineer Course Syllabus

Devops Training in Bangalore

Best Devops Course in Bangalore & Top Devops Training Institute

DEVOPS COURSE CONTENT

  

About The Course

DevOps is a practice combining both Development and Systems Operations. This course

is designed to make you a practitioner of DevOps by providing you hands-on training on tools that

have emerged as part of DevOps lifecycle.

Course Details

DevOps offline & online training is designed to help you become a DevOps practitioner. During

this course, our expert DevOps instructor will help you:

 Understand the concepts and necessities of DevOps

 Understand the need for DevOps and the day-to-day real-life problems it resolves

 Learn installation and configuration of common infrastructure servers like Apache.

 Learn popular DevOps tools like Jenkins, Puppet, Chef, Ansible, SaltStack, Nagios and

GIT

 Implement automated system update, installations and deployments

 Learn Virtualization Concepts

 Configuration deployment and packaging, continuous integration using GIT

 Manage server operations using Code which is popularly known as Infrastructure as a

Code.

The course follows the whole software development lifecycle from requirements analysis

through coding to production support.

Who should go for this course?

DevOps engineers are among the highest paid IT professionals today, and the market

demand for them is growing rapidly. With emergence of new job roles around DevOps philosophy,

anyone aspiring to get into these new roles, can take up this DevOps course. Some of these roles

are:

 DevOps Architect

 Automation Engineer

 Software Tester

 Security Engineer

 Integration Specialist

 Release Manager

Course:

 Introduction to devops

 Linux basics

 Linux admin level

 Shell Scripting

 Python Scripting

 Chef

 Puppet

 Ansible

 Saltstack

 Nagios

 Git

 Ant

 Maven

 Jenkins

 Dockers

 Virtualization

 Cloud Computing

 AWS

Introduction to DevOps:

 Background

 Ingredients of DevOps

 DevOps principles

 Who has adopted?

 Mirage or Reality?

 Challenges

 Domain specific

 Technology specific

 DevOps Toolchain (Practices and Tools)

 SDLC vs Agile/DevOps:

 Agile Values and Principles

 What is conventional software development methodology

 Advantages of Agile

 Importance of DevOps in Agile

 What is Continuous Integration

 What is Continuous Delivery

 What is Continuous Deployment

 What is continuous feedback

 Faster deployments using devops

 Collaboration

 How Automation helps devops

 DevOps job market

Linux

 Linux Overview

 What is Operating sytem

 What is Unix, Linux

 Unix vs Linux

 Linux vs Windows

 Linux market trends

 Linux flavours

 Linux Architecture

 What is shell kernel command line utilities

 Linux Boot process

 Linux commands

 Linux admin level commands

 Reading files

 Redirection operators

 Piping

 User management

 Process management

 File system management

 Linux volume manager hands on

 Linux installation using iso

 Directory structure

 Editors

 VMware overview

Scripting:

Shell scripting:

 She-bang line in shell

 Command line arguments

 Variables

 Loops

 Case statement

 Getopts

 Functions

 Regular expressions

 grep

 Awk

 Sed

Python scripting:

 Python Introduction

 Features of Python

 Python vs Perl

 Python vs shell

 Interactive mode of programming using python

 Reserved words

 Python indentation

 Python variables

 Python data types

 Numbers

 Strings

 Lists

 Tuples

 Dictionaries

 Loops

 Operators

 Break

 Continue

 pass

 Command line arguments

 Functions

 Lambda functions

 Modules

 Files

 Exception Handling

 Object Oriented concepts

 Class

 Object

 Inheritance

 Polymorphism

 Abstraction

 Method overloading

 Real time modules/scripts used

Configuration Management tools

Chef:

 Introduction to Chef:

 What is chef

 Difference between Chef open source and enterprise

 Chef Architecture

 Chef components

 Chef server

 Chef work station

 Chef client

 Installation of chef components on different machines

 Configuration of chef server, work station and development kit

 What is boot strap method

 How to add clients to chef server

 What is cook book and recipe

 How to write cookbooks, recipes

 How to search clients on command line from server

 Knife command utility

 Chef-serve-ctl utility

 Chef-client utility

 How to run cookbooks on clients

 How to download cookbooks and apply on clients

 How to write our own cookbooks

 Templates

 Source files

 Roles in chef

 Environment in chef

 Data bags in chef

 Search criterion in Chef

 Real time cookbooks

Puppet:

 Introduction to Puppet

 Difference between puppet open source and enterprise

 Puppet Architecture

 Puppet components

 Puppet Master installation and configuration

 Puppet agent installation and configuration

 Puppet connections

 Adding agents to master

 Components of Puppet

 Hiera

 Mcollective

 Puppet DB

 Puppet dash board

 Geppato

 Facter

 Catalogue

Puppet DSL

 Templates

 Defining the classes in puppet

 Relationships between resources

 Variables

 Scope

 Notify required keywords

 Puppet modules

 Site.pp vs node.pp

 Puppet manifests

 How to write basic manifests

 How to define classes

 How to write customized manifests

 Real time examples of manifests

Ansible:

 Introduction to Ansible

 Ansible Architecture

 Ansible terminology

 Ansible commands

 How to add nodes to server

 Ansible installation and configuration

 Installing ssh on nodes

 Generating the keys

 Components of Ansbile

 Inventory

 Configuration

 Modules

 Playbooks

 Global Configuration

 Roles

 Tags

 How to write playbooks

 PYYAML overview

 How to write playbooks

 Ansible modules

 Ansbible Roles

 Ansible Galaxy

 How to download playbooks from Galaxy

 Realtime playbooks

Saltstack:

 Introduction to Saltstack

 Curl

 Wget

 How to configure salt master

 How to configure salt minion

 How to establish the communication between master and minions

 Salt grains

 Search criterion using grains

 Globbing

 Regular Expressions

 Pillars

 Saltstate files SLS

 How to write basic sls

 How to write advanced sls

 How to apply the sls on minions

Monitoring tools

Nagios:

 Nagios Introduction

Nagios Architecture

 How to install Nagios

 How to configure Nagios

 Plugins in Nagios

 How to add servers to Nagios

 NRPE – Nagios Remote Plugin Executor

 How to configure plugins on remote nodes

 Monitoring with Nagios

 Using the default plugins

 Writing our plugins

Version control tools

 Git and GitHub:

 Introduction

 What is the difference between GIT and GITHUB

 How to install GIT

 How to use GIT

 Git fetch

 Git pull

 Git life cycle

Build tools

Ant:

 Ant introduction

 What is build.xml

 How to write build.xml

 Targets

 Tasks

 Real time build.xml

Continuous Integration tools:

Jenkins:

 What is Jenkins

 Introduction

 How to install and configure Jenkins

 How to achieve Continuous Integration with Jenkins

 Jenkins Jobs

 How to schedule jobs in Jenkins

 How to integrate Jenkins with Ant

 How to integrate Jenkins with Maven

 How to integrate Jenkins with Slack

 How to integrate Jenkins with Shell scripts

 How to integrate Jenkins with Python scripts

 Jenkins dashboard

 Jenkins authentication

 Jenkins plugins – how to download and use

 Parameterizing the build

 One click regression

Dockers :

 Introduction to Dockers

 Installing dockers

 What are containers

 How to manage dockers from machine

 Docker pull

 Docker run

 Docker attach

 Exploring Docker hub

 Pulling images from hub

Virtualization

 What is virtualization

 Different virtualization models

 Physical Partitioning - LPARs

 Bare metal hypervisor – Vmware ESX servers

 Hosted OS virtualization – KVM

 Software Partitioning - Dockers

Cloud Computing:

 Introduction to Cloud

 Cloud features:

 Elasticity

 Pay as you use

 Different models of Cloud:

 Iaas – Infrastructure as service

 Paas – Platform as service

 Saas – Software as service

AWS Overview

IBM - AIX

Question-1 :-
How do I boot AIX to Single-User Mode in order to perform maintenance?

Answer -

In AIX we don't tend to use single-user mode very much, because many problems require having the rootvg filesystems unmounted for repairs. However, there are some instances when it's beneficial to use single-user:
The system boot hangs due to TCP/IP or NFS configuration issues
Do do work on non-root volume groups
To debug problems with entries in /etc/inittab
To work on the system without users attempting to log in
To work without applications starting up
It is easy to unmount /tmp and /var if they need to be checked with fsck or recreated

If the system boots fine from the rootvg, then booting into single-user to repair or perform work has advantages:
It boots quicker than Maintenance Mode.
You can boot off the normal system rootvg without finding AIX Install media or setting up a NIM SPOT.
It allows you to run all commands you would normally have access to in multiuser.
Unlike maintenance mode, there is no possibility that hdisks will be renamed.

PROCEDURE:

Standalone System (no HMC):
1. Boot system with no media in the CD/DVD drive
2. Wait until you see the options of choosing another boot list, and hear beeps on the console
3. Press 6 to start diagnostics

System using an HMC:
1. Select the LPAR in the HMC GUI
2. Select Operations -> Activate
3. In the Activate window, click the button that says "Advanced"
4. Change "Boot mode" to "Diagnostic with stored boot list"
5. Click "OK" to save that change, then "OK" again to activate.

After either of these you'll see this screen:

IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM
IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM

1 = SMS Menu 5 = Default Boot List
8 = Open Firmware Prompt 6 = Stored Boot List


Memory Keyboard Network SCSI Speaker

You will see the normal AIX boot header, since you are booting from your system hard disk:
-------------------------------------------------------------------------------
                                Welcome to AIX.
                       boot image timestamp: 08:55 07/25
                 The current time and date: 10:01:01 07/25/2009
               number of processors: 1    size of memory: 512MB
          boot device: /vdevice/v-scsi@30000003/disk@8700000000000000
                     kernel size: 15004862; 64 bit kernel
-------------------------------------------------------------------------------

DIAGNOSTIC OPERATING INSTRUCTIONS

At this point the dianostic license information comes up. At the end it says:

Several keys are used to control the diagnostics:
- The Enter key continues the procedure or performs an action.
- The Backspace key allows keying errors to be corrected.
- The cursor keys are used to select an option.

To continue, press Enter.

The next screen will show you Diagnostic Functions you can perform.
On newer versions of firmware you will see Option 5 to start Single User Mode.

On older firmware you will have to go to:
3. Task selection
and scroll way down and select 'Start Shell' or 'Single User Mode'

FUNCTION SELECTION

1. Diagnostic Routines
    This selection will test the machine hardware. Wrap plugs and
    other advanced functions will not be used.
2. Advanced Diagnostic Routines
    This selection will test the machine hardware. Wrap plugs and
    other advanced functions will be used.
3. Task Selection(Diagnostics, Advanced Diagnostics, Service Aids, etc.)
    This selection will list the tasks supported by these procedures.
    Once a task is selected, a resource menu may be presented showing
    all resources supported by the task.
4. Resource Selection
    This selection will list the resources in the system that are supported
    by the diagnostic programs. Once a resource is selected, a task menu will
    be presented showing all tasks that can be run on the resource(s).
5. Single User Mode
    The system will enter single-user mode for software maintenance.

To make a selection, type the number and press Enter [1]: 5


The system will now continue the boot process.  Please wait...
Saving Base Customize Data to boot disk
Starting the sync daemon
Starting the error daemon
System initialization completed.

INIT: SINGLE-USER MODE
Password:

Give the root password at the "Password" prompt.

After getting logged in you will see a minimal rootvg mounted:
# df
Filesystem    512-blocks      Free %Used    Iused %Iused Mounted on
/dev/hd4          131072     70696   47%     2127    21% /
/dev/hd2         2129920    102104   96%    33435    71% /usr
/dev/hd9var       196608    136080   31%      431     3% /var
/dev/hd3           98304     74904   24%      148     2% /tmp

And not very many processes running:

# ps -ef
     UID    PID   PPID   C    STIME    TTY  TIME CMD
    root      1      0   0 09:49:40      -  0:00 /etc/init s
    root 151630      1   0 09:49:51   vty0  0:00 -ksh
    root 168040      1   0 09:49:48      -  0:00 /usr/sbin/syncd 60
    root 172160 151630   2 09:51:58   vty0  0:00 ps -ef
    root 176222      1   0 09:49:51      -  0:00 /usr/lib/errdemon

RUNNING 64-BIT COMMANDS
Some commands such as fsck may give you an error that 64-bit applications have not been enabled.
This is because this is enabled from inittab:
# grep 64 /etc/inittab
load64bit:2:wait:/etc/methods/cfg64 >/dev/console 2>&1 # Enable 64-bit execs

so run it by hand:
# /etc/methods/cfg64


EXITING SINGLE-USER MODE
To exit single-user mode and boot into multiuser in RunLevel 2 use:

# telinit 2

INIT: New run level: 2
Setting tunable parameters...complete
Starting Multi-user Initialization
 Performing auto-varyon of Volume Groups
 Activating all paging spaces
swapon: Paging device /dev/paging00 is already active.
swapon: Paging device /dev/hd6 activated.

The current volume is: /dev/hd10opt
Primary superblock is valid.
 Performing all automatic mounts
mount: /dev/hd4 on /: Device busy
Multi-user initialization completed
Checking for srcmstr active...complete
Starting tcpip daemons:
0513-059 The syslogd Subsystem has been started. Subsystem PID is 139390.
Jul 25 09:53:21 puma syslog:err|error syslogd: /tmp/syslog.debug: errno = 2
0513-059 The sendmail Subsystem has been started. Subsystem PID is 217218.
0513-059 The portmap Subsystem has been started. Subsystem PID is 94364.
0513-059 The inetd Subsystem has been started. Subsystem PID is 233600.
0513-059 The xntpd Subsystem has been started. Subsystem PID is 254104.
0513-059 The snmpd Subsystem has been started. Subsystem PID is 241836.
0513-059 The hostmibd Subsystem has been started. Subsystem PID is 237710.
0513-059 The snmpmibd Subsystem has been started. Subsystem PID is 180328.
0513-059 The aixmibd Subsystem has been started. Subsystem PID is 262282.
Finished starting tcpip daemons.
0513-059 The muxatmd Subsystem has been started. Subsystem PID is 127156.
Starting NFS services:
0513-059 The biod Subsystem has been started. Subsystem PID is 229540.
0513-059 The rpc.statd Subsystem has been started. Subsystem PID is 286868.
0513-059 The rpc.lockd Subsystem has been started. Subsystem PID is 299180.
Completed NFS services.
0513-059 The ctrmc Subsystem has been started. Subsystem PID is 290968.

Unauthorized use of this system is prohibited.
login:

##################################################################################

Question-2 :-
How to connect to the Virtual terminal of a partition  ?

  

Answer -

- Connecting to the Virtual Terminal(remote console) of a partition -
mkvterm -m -p

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Question-3 :-

How to remove the active virtual terminal (remote console was already opened by another user) of a partition?

Answer -

- Removing the active virtual Terminal(remote console)  of a partition when another sesstion is active -
rmvterm -m -p

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 Question-4 :-
 What is the command to check the HACMP cluster is stable or not ?

Answer -
 #lssrc -ls clstrmgrES