Devops interview questions 2 www.bigclasses.com

TOP INTERVIEW QUESTIONS & ANSWERS

41.Why is Continuous monitoring necessary?
I will suggest you to go with the below mentioned flow:
Continuous Monitoring allows timely identification of problems or weaknesses and
quick corrective action that helps reduce expenses of an organization.
Continuous monitoring provides solution that addresses three
operational disciplines known as:
● continuous audit
● continuous controls monitoring
● continuous transaction inspection

42.What are Plugins in Nagios?
Begin this answer by defining Plugins. They are scripts (Perl scripts, Shell scripts,
etc.) that can run from a command line to check the status of a host or service.
Nagios uses the results from Plugins to determine the current status of hosts and
services on your network.
Once you have defined Plugins, explain why we need Plugins. Nagios will execute
a Plugin whenever there is a need to check the status of a host or service. Plugin
will perform the check and then simply returns the result to Nagios. Nagios will
process the results that it receives from the Plugin and take the necessary actions.

43.What are the three main variables that affect recursion and
inheritance in Nagios?
According to me the proper format for this answer should be:
First name the variables and then a small explanation of each of these variables:
• Name
• Use
• Register
Then give a brief explanation for each of these variables. Name is a placeholder
that is used by other objects. Use defines the “parent” object whose properties
should be used. Register can have a value of 0 (indicating its only a template) and
1 (an actual object). The register value is never inherited.

44.What is Dockerfile used for?
This answer according to me should begin by explaining the use of Dockerfile.
Docker can build images automatically by reading the instructions from a
Dockerfile.
Now I suggest you to give a small definition of Dockerfle. A Dockerfile is a text
document that contains all the commands a user could call on the command line to
assemble an image. Using docker build users can create an automated build that
executes several command-line instructions in succession.
Now expect a few questions to test your experience with Docker.

45.What platforms does Docker run on?
I will start this answer by saying Docker runs on only Linux and Cloud platforms
and then I will mention the below vendors of Linux:
• Ubuntu 12.04, 13.04 et al
• Fedora 19/20+
• RHEL 6.5+
• CentOS 6+
• Gentoo
• ArchLinux
• openSUSE 12.3+
• CRUX 3.0+
Cloud:
• Amazon EC2
• Google Compute Engine
• Microsoft Azure
• Rackspace

46.What’s your career objective in your role as a DevOps
engineer?
My passion is breaking down the barriers and building and improving processes, so
that the engineering and operations teams work better and smarter. That’s why I
love DevOps. It’s an opportunity to be involved in the entire delivery system from
start to finish.

47.Tell us about the CI tools that you are familiar with?
The premise of CI is to get feedback as early as possible because the earlier you
get feedback, the less things cost to fix. Popular open source tools include Hudson,
Jenkins, CruiseControl and CruiseControl.NET. Commercial tools include
ThoughtWorks’ Go, Urbancode’s Anthill Pro, Jetbrains’ Team City and Microsoft’s
Team Foundation Server.

48.What problems did you face and how did you solve them in a
way that met the team’s goals?
This questions aims to find out how much you can handle stress and non-
conformity at work. Talk about your leadership skills to handle and motivate the
team to solve problems together.Talk about CI, release management and other
tools to keep interdisciplinary projects on track.

49.What is the need for DevOps?
According to me, this answer should start by explaining the general market trend.
Instead of releasing big sets of features, companies are trying to see if small
features can be transported to their customers through a series of release trains.
This has many advantages like quick feedback from customers, better quality of
software etc. which in turn leads to high customer satisfaction. To achieve this,
companies are required to:
1. Increase deployment frequency
2. Lower failure rate of new releases
3. Shortened lead time between fixes
4. Faster mean time to recovery in the event of new release crashing.

50.How do all these tools work together?
Given below is a generic logical flow where everything gets automated for seamless delivery.
However, this flow may vary from organization to organization as per the requirement.
1. Developers develop the code and this source code is managed by Version Control
System tools like Git etc.
2. Developers send this code to the Git repository and any changes made in the code
is committed to this Repository.
3. Jenkins pulls this code from the repository using the Git plugin and build it using
tools like Ant or Maven.
4. Configuration management tools like puppet deploys & provisions testing
environment and then Jenkins releases this code on the test environment on which testing is
done using tools like selenium.
5. Once the code is tested, Jenkins send it for deployment on the production server
(even production server is provisioned & maintained by tools like puppet).
6. After deployment It is continuously monitored by tools like Nagios.
7. Docker containers provides testing environment to test the build features.

51.Explain with a use case where DevOps can be used in
industry/ real-life.
There are many industries that are using DevOps so you can mention any of those use cases,
you can also refer the below example:
Etsy is a peer-to-peer e-commerce website focused on handmade or vintage items and supplies,
as well as unique factory-manufactured items. Etsy struggled with slow, painful site updates that
frequently caused the site to go down. It affected sales for millions of Etsy’s users who sold
goods through online market place and risked driving them to the competitor.
With the help of a new technical management team, Etsy transitioned from its waterfall model,
which produced four-hour full-site deployments twice weekly, to a more agile approach. Today, it
has a fully automated deployment pipeline, and its continuous delivery practices have reportedly
resulted in more than 50 deployments a day with fewer disruptions.

52.Which VCS tool you are comfortable with?
You can just mention the VCS tool that you have worked on like this: “I have worked on Git and
one major advantage it has over other VCS tools like SVN is that it is a distributed version control
system.”
Distributed VCS tools do not necessarily rely on a central server to store all the versions of a
project’s files. Instead, every developer “clones” a copy of a repository and has the full history of
the project on their own hard drive.

53.What is Git bisect? How can you use it to determine the source
of a (regression) bug?
I will suggest you to first give a small definition of Git bisect, Git bisect is used to find the commit
that introduced a bug by using binary search. Command for Git bisect is
git bisect <subcommand> <options>
Now since you have mentioned the command above, explain what this command will do, This
command uses a binary search algorithm to find which commit in your project’s history
introduced a bug. You use it by first telling it a “bad” commit that is known to contain the bug, and
a “good” commit that is known to be before the bug was introduced. Then Git bisect picks a
commit between those two endpoints and asks you whether the selected commit is “good” or
“bad”. It continues narrowing down the range until it finds the exact commit that introduced the
change.

54.How will you know in Git if a branch has already been merged
into master?
I will suggest you to include both the below mentioned commands:
git branch –merged lists the branches that have been merged into the current branch.
git branch –no-merged lists the branches that have not been merged.

55.Explain how you can move or copy Jenkins from one server to
another?
I will approach this task by copying the jobs directory from the old server to the new one. There
are multiple ways to do that; I have mentioned them below:
You can:
• Move a job from one installation of Jenkins to another by simply copying the
corresponding job directory.
• Make a copy of an existing job by making a clone of a job directory by a different
name.
• Rename an existing job by renaming a directory. Note that if you change a job
name you will need to change any other job that tries to call the renamed job.

56.What are the benefits of Automation Testing?
I have listed down some advantages of automation testing. Include these in your answer and you
can add your own experience of how Continuous Testing helped your previous company:
• Supports execution of repeated test cases
• Aids in testing a large test matrix
• Enables parallel execution
• Encourages unattended execution
• Improves accuracy thereby reducing human generated errors
• Saves time and money

57.What are the Testing types supported by Selenium?
Selenium supports two types of testing:
Regression Testing: It is the act of retesting a product around an area where a bug was fixed.
Functional Testing: It refers to the testing of software features (functional points) individually.

58.When should I use Selenium Grid?
For this answer, my suggestion would be to give a small definition of Selenium Grid. It can be
used to execute same or different test scripts on multiple platforms and browsers concurrently to
achieve distributed test execution. This allows testing under different environments and saving
execution time remarkably.

59.What is Puppet?
I will advise you to first give a small definition of Puppet. It is a Configuration Management tool
which is used to automate administration tasks.
Now you should describe its architecture and how Puppet manages its Agents. Puppet has a
Master-Slave architecture in which the Slave has to first send a Certificate signing request to
Master and Master has to sign that Certificate in order to establish a secure connection between
Puppet Master and Puppet Slave as shown on the diagram below. Puppet Slave sends request
to Puppet Master and Puppet Master then pushes configuration on Slave.
Refer the diagram below that explains the above description.

60.What is Puppet Module and How it is different from Puppet
Manifest?
For this answer, you can go with the below mentioned explanation:
A Puppet Module is a collection of Manifests and data (such as facts, files, and templates), and
they have a specific directory structure. Modules are useful for organizing your Puppet code,
because they allow you to split your code into multiple Manifests. It is considered best practice to
use Modules to organize almost all of your Puppet Manifests.
Puppet programs are called Manifests which are composed of Puppet code and their file names
use the .pp extension.

61.What is a resource in Chef?
My suggestion is to first define Resource. A Resource represents a piece of infrastructure and its
desired state, such as a package that should be installed, a service that should be running, or a
file that should be generated.
You should explain about the functions of Resource for that include the following points:
• Describes the desired state for a configuration item.
• Declares the steps needed to bring that item to the desired state.
• Specifies a resource type such as package, template, or service.
• Lists additional details (also known as resource properties), as necessary.
• Are grouped into recipes, which describe working configurations.

62.What happens when you don’t specify a Resource’s action in
Chef?
My suggestion is to first give a direct answer: when you don’t specify a resource’s action, Chef
applies the default action.
Now explain this with an example, the below resource:
file ‘C:UsersAdministratorchef-reposettings.ini’ do
content ‘greeting=hello world’
end
is same as the below resource:
file ‘C:UsersAdministratorchef-reposettings.ini’ do
action :create
content ‘greeting=hello world’
end
because: create is the file Resource’s default action.

63.Can I refresh static components of a deployed application
without having to redeploy the entire application?
Yes, you can use weblogic.Deployer to specify a component and target a server, using the
following syntax:
java weblogic.Deployer -adminurl http://admin:7001 -name appname -targets server1,server2 -
deploy jsps/*.jsp

64.What is Nagios?
You can answer this question by first mentioning that Nagios is one of the monitoring tools. It is
used for Continuous monitoring of systems, applications, services, and business processes etc in
a DevOps culture. In the event of a failure, Nagios can alert technical staff of the problem,
allowing them to begin remediation processes before outages affect business processes, end-
users, or customers. With Nagios, you don’t have to explain why an unseen infrastructure outage
affect your organization’s bottom line.
Now once you have defined what is Nagios, you can mention the various things that you can
achieve using Nagios.
By using Nagios you can:
• Plan for infrastructure upgrades before outdated systems cause failures.
• Respond to issues at the first sign of a problem.
• Automatically fix problems when they are detected.
• Coordinate technical team responses.
• Ensure your organization’s SLAs are being met.
• Ensure IT infrastructure outages have a minimal effect on your organization’s
bottom line.
• Monitor your entire infrastructure and business processes.

65.When Does Nagios Check for external commands?
Make sure that you stick to the question during your explanation so I will advise you to follow the
below mentioned flow. Nagios check for external commands under the following conditions:
• At regular intervals specified by the command_check_interval option in the main
configuration file or,
• Immediately after event handlers are executed. This is in addition to the regular
cycle of external command checks and is done to provide immediate action if an event handler
submits commands to Nagios.

66.What is meant by saying Nagios is Object Oriented?
Answer to this question is pretty direct. I will answer this by saying, “One of the features of
Nagios is object configuration format in that you can create object definitions that inherit
properties from other object definitions and hence the name. This simplifies and clarifies
relationships between various components.”

67.How to stop and restart the Docker container?
In order to stop the Docker container you can use the below command:
docker stop <container ID>
Now to restart the Docker container you can use:
docker restart <container ID>

68.Describe two-factor authentication?
Two-factor authentication is a security process in which the user provides two
means of identification from separate categories of credentials; one is typically a
physical token, such as a card, and the other is typically something memorized,
such as a security code.

69.What is the difference between RAID 0 and RAID 1?
RAID 1 offers redundancy through mirroring, i.e., data is written identically to two
drives. RAID 0 offers no redundancy and instead uses striping, i.e., data is split
across all the drives. This means RAID 0 offers no fault tolerance; if any of the
constituent drives fails, the RAID unit fails.

70.How much have you interacted with cloud based software
development?
Share your knowledge around use of cloud platforms, provisioning new instances,
coding new software iterations with the cloud provider’s APIs or software
development kits, configuring clusters to scale computing capacity, managing
workload lifecycles and so on. This is the perfect opportunity to discuss container-
based cloud instances as an alternative to conventional VMs. Event-based cloud
computing, such as AWS Lambda offers another approach to software
development, a boon for experienced DevOps candidates. In your interview,
mention experience handling big data, which uses highly scalable cloud
infrastructures to tackle complex computing tasks.

71.What was your greatest achievement on a recent project?
Make sure you demonstrate your perfect understanding of both development and
operations. Do not let your answer lean towards one particular skillset ignoring the
other. Even if you have worked in an environment wherein you had to work more
with one skillset, assure the intervewer that you are agile according to the needs of
your organization.

72.How is DevOps different from Agile / SDLC?
I would advise you to go with the below explanation:
Agile is a set of values and principles about how to produce i.e. develop software.
Example: if you have some ideas and you want to turn those ideas into working
software, you can use the Agile values and principles as a way to do that. But, that
software might only be working on a developer’s laptop or in a test environment.
You want a way to quickly, easily and repeatabley move that software into
production infrastructure, in a safe and simple way. To do that you need DevOps
tools and techniques.

73.What are the advantages of DevOps?
For this answer, you can use your past experience and explain how DevOps
helped you in your previous job. If you don’t have any such experience, then you
can mention the below advantages.
Technical benefits:
• Continuous software delivery
• Less complex problems to fix
• Faster resolution of problems
Business benefits:
• Faster delivery of features
• More stable operating environments
• More time available to add value (rather than fix/maintain)

74.What is Version control?
This is probably the easiest question you will face in the interview. My suggestion is
to first give a definition of Version control. It is a system that records changes to a
file or set of files over time so that you can recall specific versions later. Version
control systems consist of a central shared repository where teammates can
commit changes to a file or set of file. Then you can mention the uses of version
control.
Version control allows you to:
• Revert files back to a previous state.
• Revert the entire project back to a previous state.
• Compare changes over time.
• See who last modified something that might be causing a problem.
• Who introduced an issue and when.

75.What is Git?
I will suggest that you attempt this question by first explaining about the architecture of git as
shown in the below diagram. You can refer to the explanation given below:
• Git is a Distributed Version Control system (DVCS). It can track changes to a file
and allows you to revert back to any particular change.
• Its distributed architecture provides many advantages over other Version Control
Systems (VCS) like SVN one major advantage is that it does not rely on a central server to store
all the versions of a project’s files. Instead, every developer “clones” a copy of a repository I have
shown in the diagram below with “Local repository” and has the full history of the project on his
hard drive so that when there is a server outage, all you need for recovery is one of your
teammate’s local Git repository.
• There is a central cloud repository as well where developers can commit changes
and share it with other teammates as you can see in the diagram where all collaborators are
commiting changes “Remote repository”.

76.What is Git rebase and how can it be used to resolve conflicts
in a feature branch before merge?
According to me, you should start by saying git rebase is a command which will merge another
branch into the branch where you are currently working, and move all of the local commits that
are ahead of the rebased branch to the top of the history on that branch.
Now once you have defined Git rebase time for an example to show how it can be used to
resolve conflicts in a feature branch before merge, if a feature branch was created from master,
and since then the master branch has received new commits, Git rebase can be used to move
the feature branch to the tip of master.
The command effectively will replay the changes made in the feature branch at the tip of master,
allowing conflicts to be resolved in the process. When done with care, this will allow the feature
branch to be merged into master with relative ease and sometimes as a simple fast-forward
operation.

77.Why do you need a Continuous Integration of Dev & Testing?
For this answer, you should focus on the need of Continuous Integration. My suggestion would
be to mention the below explanation in your answer:
Continuous Integration of Dev and Testing improves the quality of software, and reduces the time
taken to deliver it, by replacing the traditional practice of testing after completing all development.
It allows Dev team to easily detect and locate problems early because developers need to
integrate code into a shared repository several times a day (more frequently). Each check-in is
then automatically tested.

78.Explain how you can setup Jenkins job?
My approach to this answer will be to first mention how to create Jenkins job. Go to Jenkins top
page, select “New Job”, then choose “Build a free-style software project”.
Then you can tell the elements of this freestyle job:
• Optional SCM, such as CVS or Subversion where your source code resides.
• Optional triggers to control when Jenkins will perform builds.
• Some sort of build script that performs the build (ant, maven, shell script, batch file,
etc.) where the real work happens.
• Optional steps to collect information out of the build, such as archiving the artifacts
and/or recording javadoc and test results.
• Optional steps to notify other people/systems with the build result, such as sending
e-mails, IMs, updating issue tracker, etc..

79.How to automate Testing in DevOps lifecycle?
I have mentioned a generic flow below which you can refer to:
In DevOps, developers are required to commit all the changes made in the source code to a
shared repository. Continuous Integration tools like Jenkins will pull the code from this shared
repository every time a change is made in the code and deploy it for Continuous Testing that is
done by tools like Selenium .

80.What is Selenium IDE?
My suggestion is to start this answer by defining Selenium IDE. It is an integrated development
environment for Selenium scripts. It is implemented as a Firefox extension, and allows you to
record, edit, and debug tests. Selenium IDE includes the entire Selenium Core, allowing you to
easily and quickly record and play back tests in the actual environment that they will run in.
Now include some advantages in your answer. With autocomplete support and the ability to
move commands around quickly, Selenium IDE is the ideal environment for creating Selenium
tests no matter what style of tests you prefer.

81.Which open source or community tools do you use to make
Puppet more powerful?
Over here, you need to mention the tools and how you have used those tools to
make Puppet more powerful. Below is one example for your reference:
Changes and requests are ticketed through Jira and we manage requests through
an internal process. Then, we use Git and Puppet’s Code Manager app to manage
Puppet code in accordance with best practices. Additionally, we run all of our
Puppet changes through our continuous integration pipeline in Jenkins using the
beaker testing framework.

82.What is Facter in Puppet?
You are expected to answer what exactly Facter does in Puppet so according to
me, you should say, “Facter gathers basic information (facts) about Puppet Agent
such as hardware details, network settings, OS type and version, IP addresses,
MAC addresses, SSH keys, and more. These facts are then made available in
Puppet Master’s Manifests as variables.”

83.What do you mean by recipe in Chef?
For this answer, I will suggest you to use the above mentioned flow: first define
Recipe. A Recipe is a collection of Resources that describes a particular
configuration or policy. A Recipe describes everything that is required to configure
part of a system.
After the definition, explain the functions of Recipes by including the following
points:
• Install and configure software components.
• Manage files.
• Deploy applications.
• Execute other recipes.

84.How do I see a list of all of the ansible_ variables?
Ansible by default gathers “facts” about the machines under management, and
these facts can be accessed in Playbooks and in templates. To see a list of all of
the facts that are available about a machine, you can run the “setup” module as an
ad-hoc action:
Ansible -m setup hostname
This will print out a dictionary of all of the facts that are available for that particular
host.

85.When should I use the external_stage option?
Set -external_stage using weblogic.Deployer if you want to stage the application
yourself, and prefer to copy it to its target by your own means.

86.Discuss your experience building bridges between IT Ops, QA
and development.
DevOps is all about effective communication and collaboration. I’ve been able to
deal with production issues from the development and operations sides, effectively
straddling the two worlds. I’m less interested in finding blame or playing the hero
than I am with ensuring that all of the moving parts come together.

87.What are the advantages of NoSQL database over RDBMS?
The advantages are:
1. Less need for ETL
2. Support for unstructured text
3. Ability to handle change over time
4. Breadth of functionality
5. Ability to scale horizontally
6. Support for multiple data structures
7. Choice of vendors

88.Which scripting languages do you think are most important for
a DevOps engineer?
As far as scripting languages go, the simpler the better. In fact, the language itself
isn’t as important as understanding design patterns and development paradigms
such as procedural, object-oriented, or functional programming.

89.What other tools are you familiar with that might help you in
this role?
DevOps is so diverse and inclusive that it rarely ends with coding, testing and
systems. A DevOps project might rely on database platforms like SQL or NoSQL,
data structure servers like Redis, or configuration and management issue tracking
systems like Redmine. Web applications are popular for modern enterprises,
making a background with Web servers, like Microsoft Internet Information
Services, Apache Tomcat or other Web servers, beneficial. Make sure to bring
across that you are familiar with Agile application lifecycle management techniques
and tools.

90.What is Ansible module?
Modules are considered to be the units of work in Ansible. Each module is mostly
standalone and can be written in a standard scripting language such as Python,
Perl, Ruby, bash, etc.. One of the guiding properties of modules is idempotency,
which means that even if an operation is repeated multiple times e.g. upon
recovery from an outage, it will always place the system into the same state.

91.How does a Cookbook differ from a Recipe in Chef?
The answer to this is pretty direct. You can simply say, “a Recipe is a collection of
Resources, and primarily configures a software package or some piece of
infrastructure. A Cookbook groups together Recipes and other information in a way
that is more manageable than having just Recipes alone.”

92.How to launch Browser using WebDriver?
The following syntax can be used to launch Browser:
WebDriver driver = new FirefoxDriver();
WebDriver driver = new ChromeDriver();
WebDriver driver = new InternetExplorerDriver();

93.Why is Continuous Testing important for DevOps?
You can answer this question by saying, “Continuous Testing allows any change
made in the code to be tested immediately. This avoids the problems created by
having “big-bang” testing left to the end of the cycle such as release delays and
quality issues. In this way, Continuous Testing facilitates more frequent and good
quality releases.”

94.What is Continuous Testing?
I will advise you to follow the below mentioned explanation:
Continuous Testing is the process of executing automated tests as part of the
software delivery pipeline to obtain immediate feedback on the business risks
associated with in the latest build. In this way, each build is tested continuously,
allowing Development teams to get fast feedback so that they can prevent those
problems from progressing to the next stage of Software delivery life-cycle. This
dramatically speeds up a developer’s workflow as there’s no need to manually
rebuild the project and re-run all tests after making changes.

95.Explain how can create a backup and copy files in Jenkins?
Answer to this question is really direct. To create a backup, all you need to do is to
periodically back up your JENKINS_HOME directory. This contains all of your build
jobs configurations, your slave node configurations, and your build history. To
create a back-up of your Jenkins setup, just copy this directory. You can also copy
a job directory to clone or replicate a job or rename the directory.

96.In Git how do you revert a commit that has already been
pushed and made public?
There can be two answers to this question so make sure that you include both
because any of the below options can be used depending on the situation:
• Remove or fix the bad file in a new commit and push it to the remote
repository. This is the most natural way to fix an error. Once you have made
necessary changes to the file, commit it to the remote repository for that I will use
git commit -m “commit message”
• Create a new commit that undoes all changes that were made in the
bad commit.to do this I will use a command
git revert <name of bad commit>

97.What is the most important thing DevOps helps us achieve?
According to me, the most important thing that DevOps helps us achieve is to get
the changes into production as quickly as possible while minimizing risks in
software quality assurance and compliance. This is the primary objective of
DevOps. Learn more in this DevOps tutorial blog However, you can add many
other positive effects of DevOps.
For example, clearer communication and better working relationships between
teams i.e. both the Ops team and Dev team collaborate together to deliver good
quality software which in turn leads to higher customer satisfaction.

98.How do you squash last N commits into a single commit?
There are two options to squash last N commits into a single commit. Include both
of the below mentioned options in your answer:
• If you want to write the new commit message from scratch use the
following command
git reset –soft HEAD~N &&
git commit
• If you want to start editing the new commit message with a
concatenation of the existing commit messages then you need to extract those
messages and pass them to Git commit for that I will use
git reset –soft HEAD~N &&
git commit –edit -m”$(git log –format=%B –reverse .HEAD@{N})”

99.How can I set deployment order for applications?
WebLogic Server 8.1 allows you to select the load order for applications. See the
Application MBean Load Order attribute in Application. WebLogic Server deploys
server-level resources (first JDBC and then JMS) before deploying applications.
Applications are deployed in this order: connectors, then EJBs, then Web
Applications. If the application is an EAR, the individual components are loaded in
the order in which they are declared in the application.xml deployment descriptor.

100.What is Docker container?
This is a very important question so just make sure you don’t deviate from the
topic. I advise you to follow the below mentioned format:
Docker containers include the application and all of its dependencies but share the
kernel with other containers, running as isolated processes in user space on the
host operating system. Docker containers are not tied to any specific infrastructure:
they run on any computer, on any infrastructure, and in any cloud.
Now explain how to create a Docker container, Docker containers can be created
by either creating a Docker image and then running it or you can use Docker
images that are present on the Dockerhub.
Docker containers are basically runtime instances of Docker images.

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