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Linux Interview Questions for DevOps: Crack
Your Dream Job
Linux Interview Questions and Answers for DevOps
Unlock your DevOps career with the power of Linux! Linux Interview Questions for DevOps are
key to showcasing your expertise in system management and automation. In this article, we’ve
compiled the most impactful Linux interview questions for DevOps, designed to help you build
conﬁdence and stand out to employers.
Top 50+ Linux Interview Questions and Answers for
DevOps
Q 1. What is DevOps?
In the Interview Tutorial, Master these questions, and you'll be ready to take on any challenge in
your DevOps journey.

Aspect
Size
Isolation
Some basic Linux commands include
copying ﬁles.
for listing ﬁles,
Container
Smaller
Virtual Machine
Larger
Process-level isolationHardware-level isolation
for changing directories and
While Agile focuses on iterative development, DevOps emphasizes continuous integration and
delivery, bridging development with operations.
A container in DevOps is a lightweight, standalone, and executable package that includes
everything needed to run a piece of software.
for
DevOps is a methodology that combines software development and IT operations aimed at
shortening the development lifecycle.
Q 4. What is a container in DevOps?
Q 3. Explain the basic Linux commands.
Q 2. What is the difference between DevOps and Agile?
Q 5. What is the difference between a container and a virtual
machine?
ls cd cp

Startup Time Faster
Resource UsageEfficient
Use Case Microservices
The benefits of using Git are explained below:
Version control
Collaboration between developers
Branching and merging
Rollback capabilities
Distributed nature
Slower
Heavier
Legacy apps
Continuous Integration is the practice of automatically building and testing code changes to
ensure that software is always in a deployable state.
A version control in DevOps system tracks changes in the codebase, enabling multiple
developers to work on the same project without overwriting each other's work.
Docker is a platform that enables developers to package applications and their dependencies
into containers, ensuring consistent environments across systems.
Jenkins in DevOps is an open-source automation server used to build, test, and deploy
software applications continuously. It integrates with multiple DevOps tools.
Q 11. What is Kubernetes?
Q 9. What is Jenkins in DevOps?
Q 10. What is the purpose of Docker?
Q 7. What are the benefits of using Git?
Q 6. What is Continuous Integration (CI)?
Q 8. What is the role of a version control system in DevOps?

The advantages of using Linux in DevOps are:
Open-source and cost-effective
Strong command-line tools
Flexible and customizable
Great support for automation
Compatible with most cloud platforms
Configuration management tools like Ansible, Chef, and Puppet automate the setup and
maintenance of infrastructure, ensuring consistency and reducing manual errors.
Continuous Integration involves regularly merging code changes into the main branch, while
Continuous Deployment automatically deploys those changes to production...
Infrastructure as Code (IaC) is the practice of managing and provisioning infrastructure
through code, enabling automation, consistency, and versioning of infrastructure
configurations.
Microservices are a design pattern where an application is broken into smaller, independent
services, each running its own process and communicating via APIs...
Kubernetes is an open-source container orchestration platform for automating deployment,
scaling, and managing containerized applications.
Q 15. What are microservices in DevOps?
Q 17. How can you troubleshoot a Linux system?
Q 16. What are the advantages of using Linux in DevOps?
Q 13. Explain the concept of Infrastructure as Code (IaC).
Q 12. What is the role of configuration management tools in
DevOps?
Q 14. What is the difference between Continuous Integration and
Continuous Deployment?

Troubleshooting Linux systems involves checking logs (e.g.,
like top and ps to check system performance and examine configuration files.
The key differences between Unix and Linux"
Aspect Unix
Proprietary
Linux
Open-source
License
System
Monolithic kernel Modular kernel
Architecture
Cost Paid
Not available
Enterprise
environments
Free
Available for modification
Wide range of uses (servers, desktops, embedded
systems)
Source Code
Usage
Ansible is an open-source automation tool used for configuration management, application
deployment, and task automation. It simplifies automation by using simple, human-readable
YAML configuration files (called playbooks). Unlike other tools, it doesn’t require an agent to
be installed on the target machine, making it lightweight and easy to set up.
), using tools
A VPN is a service that encrypts your internet connection, providing privacy and security by
creating a private network over the public internet. It allows users to access network
resources remotely and securely, as well as to hide their IP addresses for anonymity when
browsing.
Load balancing ensures that incoming network traffic is distributed across multiple servers,
improving the availability and reliability of applications.
/var/log/syslog
Q 19. What is Ansible?
Q 22. How does the Linux file system work?
Q 20. What is a Virtual Private Network (VPN)?
Q 18. Explain the concept of Load Balancing in DevOps.
Q 21. What are the key differences between Unix and Linux?

The components of the DevOps lifecycle:
Planning: Requirements gathering and defining features.
Development: Coding and unit testing by the development team.
Build: Integration of all components and dependencies to create the software product.
Testing: Automate tests are run to verify the software works as expected.
Release: Deploying the application to production.
The chmod (change mode) command in Linux is used to change the access permissions of
files and directories. It modifies read, write, and execute permissions for the owner, group, and
others. Permissions can be set using symbolic (e.g., chmod u+x file) or numeric (e.g., chmod
755 file) formats.
The Linux file system organizes data into a hierarchical directory structure with directories
such as /bin, /etc, /home, and /var. The system starts with the root directory / at the top.
Every file and directory on a Linux system is located relative to this root directory. This structure
enables efficient file management, easy access, and organization.
Q 23. Explain the use of the 'chmod' command in Linux.
Q 24. What are the components of the DevOps lifecycle?

Directory Links
Cross-File System
Symbolic
Representation
The difference between a hard link and a soft link in Linux:
Aspect Hard Link
Points directly to the inode
Soft Link (Symbolic Link)
Points to the file name
Reference
File data remains if the original isLink breaks if the original file is
File Deletion
deleted
Cannot link to directories (except
by root)
Cannot cross file systems
deleted
Can link to directories
Can link across file systems
No special symbol Symbolized by "->"
A reverse proxy sits between client devices and web servers, forwarding requests to the
appropriate backend server. It improves security, load balancing, and performance by caching
static content, managing SSL certificates, and hiding backend server details from the client.
A cron job is a scheduled task that runs at specified intervals. To set one up, use the crontab
command. You can edit the cron jobs by typing crontab -e, which opens the cron configuration
file. A cron job follows the syntax: * * * * * /path/to/command, where the five stars represent
different time and date fields.
Operate: Managing the application in production, ensuring it runs smoothly.
Monitor: Continuously monitor system health and performance to identify potential issues.
A Kubernetes Pod is the smallest and simplest unit in Kubernetes, which can hold one or more
containers. Pods allow containers to share the same network IP, port space, and storage,
enabling applications to run as a group on a shared infrastructure.
Q 28. What is a Kubernetes Pod?
Q 26. How do you set up a cron job in Linux?
Q 27. What is the role of a reverse proxy in a web server setup?
Q 25. What is the difference between a hard link and a soft link in
Linux?

Q 31. What are Docker volumes?
Docker volumes are persistent storage units used by containers to store data. They exist
outside the container filesystem, which allows them to persist even if the container is
removed. Volumes can be shared among multiple containers, providing a way to ensure
data consistency and ease of backup.
Q 29. What are the benefits of using containers in DevOps?
The benefits of using containers in DevOps:
Q 30. What is the difference between a Docker image and a
container?
The difference between a Docker image and a container
Q 32. What is the significance of the 'ps' command in Linux?
The ps (process status) command in Linux is used to display information about running
processes, including process ID (PID), memory usage, and CPU time. It helps users to manage
Portability: Containers run the same way across different environments.
Scalability: Containers can be quickly scaled up or down based on demand.
Isolation: Each container runs in its isolated environment, improving security.
Efficiency: Containers are lightweight and share the host system's resources.
Faster deployment: Containers speed up the development-to-production cycle.
Aspect Docker Image Docker Container
A Docker image is a blueprint that contains everythingA container is a running
Docker
Definitionneeded to run a container (including the operatinginstance of a
system, libraries, etc.)
Immutable, read-only
image.
Mutable, running state
State
Exists as a running
ExistenceExists as a file on disk
process in memory
Created by running a
CreationCreated from a Dockerfile
Docker image
Used to execute code
Usage Used to create containers
from a Docker image

and troubleshoot system processes. Common options include
processes and ps -ef for a full list.
to display all running
The top command provides a dynamic, real-time view of system processes. It displays CPU
usage, memory consumption, and process information, helping users monitor and manage
system performance efficiently.
You can use the df command to view disk usage in Linux, which displays the amount of disk
space used and available on all mounted filesystems. The du command can be used to check
disk usage of a specific directory or file.
A system call is a request made by a program to the operating system to perform a specific
function, such as reading or writing files, allocating memory, or creating processes. Linux
provides several system calls for interacting with the kernel.
Docker Swarm is a container orchestration tool that allows you to manage a cluster of Docker
nodes as a single virtual system. It provides features like high availability, scaling, and service
discovery, allowing containers to be deployed across multiple machines in a seamless manner.
Network Load Balancing (NLB) is a technique used to distribute network traffic across multiple
servers or resources. It enhances system availability, reliability, and scalability by ensuring that
traffic is evenly distributed, preventing any single server from becoming overwhelmed.
ps aux
Q 36. What is Docker Swarm?
Q 34. What is a system call in Linux?
Q 33. How can you view disk usage in Linux?
Q 37. What is the purpose of the 'top' command in Linux?
Q 35. Explain the concept of Network Load Balancing (NLB).
Q 38. How does Kubernetes handle the scaling of applications?

Kubernetes uses Horizontal Pod Autoscaling (HPA) to automatically scale applications based
on metrics like CPU or memory usage. When demand increases, Kubernetes adds more pod
replicas, and when the load decreases, it reduces the number of replicas accordingly, ensuring
optimal resource usage.
The grep command is used to search for specific patterns in files or output. It can be used with
regular expressions to search for complex patterns. For example, grep "error" log.txt would
search for occurrences of the word "error" in the file log.txt.
The tail command is used to display the last few lines of a file. It is often used to monitor log
files in real-time by using the -f option, which continuously displays new lines as they are added
to the file.
Continuous Integration (CI) and Continuous Deployment (CD) are practices in DevOps where
code changes are automatically built, tested, and deployed. A CI/CD pipeline automates these
processes, ensuring that software is always in a deployable state and can be quickly released
to production with minimal human intervention.
A load balancer is a device or software that distributes network or application traffic across
multiple servers to ensure high availability and reliability by avoiding overloading any single
server. It can operate at different layers of the network stack (e.g., Layer 4 for TCP/UDP or
Layer 7 for HTTP).
A firewall in Linux is used to control incoming and outgoing network traffic based on
predefined security rules. It helps protect the system from unauthorized access and potential
Q 42. What is a Load Balancer in DevOps?
Q 39. What is the CI/CD pipeline in DevOps?
Q 43. What is the purpose of a firewall in Linux?
Q 41. What is the use of the 'tail' command in Linux?
Q 40. Explain the role of the 'grep' command in Linux.

threats by filtering traffic and preventing malicious activities.
Continuous Testing involves running automated tests continuously throughout the software
development lifecycle. DevOps helps identify issues early by testing code changes
immediately after they are integrated, ensuring that defects are detected and fixed quickly.
Git is a distributed version control system used to manage and track changes to code during
software development. It allows multiple developers to work on a project simultaneously
without interfering with each other's work, and it helps maintain the integrity of the project by
tracking changes over time.
A Dockerfile is a text document that contains all the instructions needed to build a Docker
image. It defines the base image, installs dependencies, copies files, and sets environment
variables. By running docker build with a Dockerfile, you can create an image that can be
used to run containers.
Monitoring tools like Prometheus, Grafana, and Nagios are used to track application and
infrastructure performance.
Set up alerts for key metrics such as CPU usage, memory consumption, and response time.
Analyze logs and metrics to identify performance bottlenecks.
Automate performance testing and scaling to ensure systems can handle high loads.
Use A/B testing to assess system behavior under different configurations.
Q 47. What is Git in DevOps?
Q 46. What is Continuous Testing in DevOps?
Q 45. What is the significance of Dockerfile in Docker?
Q 44. How do you monitor performance in a DevOps environment?

Q 50. What is GitHub?
GitHub is a web-based platform that uses Git for version control. It allows developers to
collaborate on code, track changes, and manage projects. GitHub offers features like pull
requests, issue tracking, and project management tools, making it an essential platform for
DevOps teams.
Q 52. What is the role of a 'container registry'?
A container registry is a service used to store and manage container images. It serves as a
repository for images, allowing teams to share and distribute containers. Popular container
Q 51. What is the purpose of 'iptables' in Linux?
iptables is a command-line firewall utility used to configure the rules for incoming and outgoing
network traffic. It controls the flow of traffic to and from the system based on defined security
policies. Users can set up rules to block or allow connections, making it an essential tool for
Linux-based system security.
Q 48. Explain the concept of 'immutable infrastructure'.
Immutable infrastructure refers to the practice of creating and managing servers or
infrastructure that cannot be changed after they are deployed. Instead of modifying the existing
infrastructure, new versions are deployed to replace the old ones. This approach ensures
consistency and reduces the risk of configuration drift.
Q 49. What are the different types of network topologies in
DevOps?
The different types of network topologies in DevOps:
Star Topology: All devices are connected to a central hub.
Ring Topology: Devices are connected in a circular fashion.
Mesh Topology: Every device is connected to every other device.
Bus Topology: Devices are connected to a central cable (bus).
Hybrid Topology: A combination of two or more topologies.

The difference between a StatefulSet and a Deployment in Kubernetes:
Aspect StatefulSet Deployment
For stateful applications requiring
Purpose For stateless applications
persistent storage
Pod Pods
identifiers
Requires persistent storage for stateful
apps
have stable, unique networkPods have random identifiers and are
Identity ephemeral
Storage Does not require persistent storage
Implement automated security testing during the build phase using tools like Snyk or Aqua
Security.
Use secure code practices and regularly update dependencies to mitigate vulnerabilities.
Ensure proper access control and use role-based access to limit exposure.
Monitor production environments for security breaches with tools like SIEM systems.
Integrate vulnerability scanning and penetration testing into the CI/CD pipeline.
Kubernetes Services are an abstraction that defines a logical set of pods and provides a stable
endpoint for accessing them. They allow load balancing and service discovery for pods. Types
of services include ClusterIP (default), NodePort, LoadBalancer, and ExternalName.
Continuous Monitoring is the practice of continuously monitoring the performance and health
of the application, infrastructure, and environment in real-time. It helps detect any issues or
vulnerabilities early, which allows teams to respond quickly and maintain system uptime. Tools
like Prometheus, Nagios, and New Relic are commonly used in continuous monitoring.
registries include Docker Hub and private registries that ensure security and access control
over the images being used in different environments.
Q 55. What are Kubernetes Services?
Q 53. What is Continuous Monitoring in DevOps?
Q 56. What is the difference between a StatefulSet and a
Deployment in Kubernetes?
Q 54. How can you implement security in a DevOps pipeline?

Scaling Scaled one pod at a time
Databases, queues, etc.
Use Case
Scales all pods simultaneously
Web servers, APIs, etc.
A container orchestrator like Kubernetes manages the deployment, scaling, and networking of
containers. It automates container lifecycle management, ensuring that the desired number of
containers are running and handling failures, scaling, and updates seamlessly across a cluster
of machines.
The git stash command allows developers to temporarily save changes that are not yet ready
to commit. It stores the changes in a stack, allowing the developer to switch branches or
Docker Compose is a tool for defining and running multi-container Docker applications. Using a
docker-compose.yml file, users can define the services, networks, and volumes needed for
an application. It simplifies running complex applications by handling dependencies and
starting multiple containers with a single command.
Helm is a package manager for Kubernetes, and a Helm Chart is a package that contains all the
resource definitions needed to run an application, tool, or service within a Kubernetes cluster.
Helm Charts allow users to deploy applications with a single command, making it easier to
manage and version applications.
The chmod command in Linux is used to change the file permissions of a file or directory. It
allows the user to grant or revoke read, write, and execute permissions for the owner, group,
and others. The command can be used in symbolic (e.g., chmod u+x file) or numeric mode
(e.g., chmod 755 file) to modify access rights.
Q 60. What are Helm Charts in Kubernetes?
Q 59. What is the 'docker-compose' tool used for?
Q 58. What is the role of a container orchestrator?
Q 61. What is the role of 'git stash' in version control?
Q 57. What is the purpose of the 'chmod' command in Linux?

Scalability: Individual services can be scaled independently based on demand.
Fault Isolation: Failure in one service does not affect the entire application.
Faster Time to Market: Teams can develop, test, and deploy individual services
independently.
Technology Flexibility: Different services can be built using different technologies suited to
specific needs.
Improved Maintainability: Smaller, focused services are easier to maintain and upgrade.
Jenkins integrates with Docker by running builds in Docker containers. Jenkins can use the
Docker plugin to pull images, build new images, and execute tasks inside containers. This
setup enables consistent environments across different stages of the pipeline, from
development to testing and deployment.
perform other tasks without losing their work. Once ready, the changes can be applied back
using git stash apply.
The systemctl command is used to control and manage the systemd system and service
manager. It allows administrators to start, stop, restart, enable, or disable services. For
example, systemctl start apache2 starts the Apache service, and systemctl status
apache2 checks its status.
An artifact repository is a storage system for binary files or artifacts generated from the build
process. Tools like Nexus, Artifactory, and AWS S3 are used to store compiled code, libraries,
and container images. They enable sharing and versioning of artifacts across teams and
environments.
Q 66. What is the purpose of 'awk' in Linux?
Q 63. How does Jenkins integrate with Docker?
Q 65. What is an Artifact Repository in DevOps?
Q 62. What are the benefits of microservices architecture?
Q 64. What is the purpose of the 'systemctl' command in Linux?

Feature
Configuration
Language
Agent-Based
Ease of Use
Execution Model
Community Support
Ansible Puppet
Uses YAML (Declarative) Uses its own DSL (Declarative)
No (Agentless)
Simple and easy to learn
Push model (no agent)
Yes (Agent required)
Steeper learning curve
Pull model (agent-based)
Active community with manyLarge community and enterprise
modules support
The kill command in Linux is used to terminate processes. You can send signals to processes
using the process ID (PID) or a signal name. For example, kill 1234 sends a termination signal
to the process with PID 1234.
A daemon is a background process in Linux that runs without user interaction. It often handles
system-level tasks such as monitoring hardware, managing network services, or logging
system activity. Examples include sshd (Secure Shell Daemon) and httpd (Apache HTTP
Daemon).
Containers are lightweight, portable, and self-sufficient units that package software and its
dependencies together. They ensure consistency across different environments, from
development to production. Docker is a popular tool for managing containers, which helps
automate deployment, scaling, and management of applications.
awk is a versatile programming language used for pattern scanning and processing. It allows
you to search for patterns in text files, perform text transformations, and generate reports. awk
processes input line by line, making it useful for processing columns of data.
Q 70. What is a 'Daemon' in Linux?
Q 67. What are containers in DevOps?
Q 69. What is the 'kill' command in Linux?
Q 71. How do you perform logging in DevOps?
Q 68. What is the difference between Ansible and Puppet?

A Jenkins Pipeline is a suite of plugins that supports continuous delivery. It defines the process
of building, testing, and deploying code in a structured and repeatable way. Pipelines are
typically defined in a Jenkinsfile, which can be version-controlled along with the codebase.
Logging in DevOps is done using centralized log management tools like ELK Stack
(Elasticsearch, Logstash, Kibana), Fluentd, and Splunk. These tools aggregate logs from
various sources and provide real-time analysis, helping to detect issues early and monitor
system performance.
Docker Networking enables communication between containers. Docker provides several
network modes, including Bridge (default), Host, None, and Overlay. These modes help
containers communicate with each other, the host system, or external networks while
maintaining security and isolation.
Terraform is an open-source Infrastructure as Code (IaC) tool that allows you to define,
provision, and manage infrastructure using configuration files. It is widely used in DevOps for
automating the deployment of infrastructure across various cloud providers like AWS, Azure,
and Google Cloud.
The cron command is used to schedule recurring tasks in Linux. It runs jobs at specified times,
intervals, or dates, such as backing up data or running system updates. The configuration file
Q 73. What is a Jenkins Pipeline?
Q 74. What is Docker Networking?
Q 75. What is the role of 'cron' in Linux?
Q 72. What is Terraform and how is it used in DevOps?

for cron jobs is called
Docker uses namespaces for process isolation.
Docker leverages control groups (cgroups) for resource management.
It uses image signing and trusted registries to ensure the authenticity of images.
Docker containers run with the principle of least privilege, limiting container access.
Security scanning tools can detect vulnerabilities in images before they are deployed.
sed (stream editor) is a powerful Linux command used for text manipulation. It can perform
find and replace operations, delete lines, or insert text into files. Example: sed 's/old/new/g'
file.txt replaces all occurrences of 'old' with 'new' in file.txt.
Scalability: NoSQL databases are designed to scale horizontally, making them suitable for
high-traffic applications.
Flexibility: They support unstructured data and can store data in various formats such as
JSON, BSON, or XML.
Idempotency ensures that repeated execution of an operation will have the same result,
regardless of how many times it is performed. This principle is crucial in DevOps, as it ensures
that infrastructure provisioning, configuration management, and deployments are predictable
and consistent.
Linux is an open-source operating system based on Unix. It is known for being reliable, secure,
and customizable. Many developers and system administrators use Linux for servers, desktops,
and various devices due to its flexibility and wide range of distributions like Ubuntu and CentOS.
crontab.
Q 77. What is Linux?
Q 76. How does Docker handle security?
Q 78. How do you use the 'sed' command in Linux?
Q 79. What is the significance of 'idempotency' in DevOps?
Q 80. What are the advantages of using a NoSQL database in a
DevOps environment?

The ping command is used to test the network connectivity between the host machine and
another device on the network. It sends ICMP echo requests and waits for responses. It is
often used to check if a server is up or diagnose network issues.
The df command in Linux is used to display disk space usage of file systems. It provides
information about the available and used space for all mounted file systems, helping
system
administrators monitor storage capacity.
High availability: NoSQL databases typically offer built-in replication and distributed
architectures, ensuring high availability.
Performance: They can handle large volumes of data and provide faster data retrieval for
certain use cases.
Schema-less design: NoSQL databases allow developers to easily modify the schema
without downtime.
The ls command is used to list the contents of a directory. It displays files and directories in
the current directory or a specified directory. Common options include -l for long listing format
and -a to show hidden files.
Configuration management in DevOps is handled by automation tools like Ansible, Puppet, and
Chef. These tools ensure that system configurations are consistent across all environments,
making it easier to deploy, scale, and manage infrastructure in a repeatable and reliable
manner.
Q 84. What is the 'ls' command in Linux?
Q 83. What is the 'df' command in Linux?
Q 81. What is the 'ping' command in Linux?
Q 85. What is the purpose of 'Docker Compose'?
Q 82. How do you handle configuration management in a DevOps
pipeline?

Docker Compose allows you to define and manage multi-container Docker applications. It uses
a YAML file to define services, networks, and volumes, simplifying the deployment of complex
applications by managing all containers in one command.
A Kubernetes Pod is the smallest deployable unit in Kubernetes, which encapsulates one or
more containers, storage resources, and a network identity. Pods enable containers within
them to share the same network namespace, allowing communication between them. They
are useful for running applications that require multiple containers, such as web servers and
databases.
The ps command in Linux is used to display information about the active processes. It provides
details like process ID (PID), CPU usage, memory usage, and the status of running processes. It
A Virtual Machine (VM) is a software-based emulation of a physical computer. It runs an
operating system and applications like a real computer but is isolated from the host system.
VMs are widely used for testing, development, and running multiple operating systems on a
single physical machine.
The types of load balancers in Kubernetes:
ClusterIP: The default service type that provides a virtual IP within the cluster for internal
communication.
NodePort: Exposes the service on each node's IP at a static port, accessible from outside
the cluster.
LoadBalancer: Provisioned by cloud providers, it exposes the service externally using a
cloud provider's load balancer.
ExternalName: Maps service to an external DNS name, allowing access to external
services using the Kubernetes DNS system.
Q 87. What are Kubernetes Pods?
Q 86. What is a Virtual Machine (VM)?
Q 89. What is the purpose of the 'ps' command in Linux?
Q 88. What are the types of load balancers in Kubernetes?

is an essential command for system administrators to monitor and manage system
processes.
An image repository in Docker is a central location where Docker images are stored and
distributed. Docker Hub is a public image repository, but users can also set up private
repositories using tools like Docker Registry. These repositories allow users to access
and share images for their applications and services.
The "rm" command in Linux is used to remove files and directories. It deletes the specified files
from the file system. Common options include"-r" for recursive deletion of directories and -f
for force deletion without confirmation.
A Systemd unit is a configuration file that defines a service, socket, device, mount point, or
other system resources. These units are used to control and manage the system's services
or daemons. Examples of unit files include service files, mount files, and socket files.
The docker pull command is used to download a Docker image from a registry to the local
machine. This command ensures that the necessary image is available locally for creating
and running containers. For example, docker pull ubuntu pulls the latest Ubuntu image from
Docker Hub.
Helm is a package manager for Kubernetes, which helps deploy, manage, and share Kubernetes
applications. It uses 'Charts' (pre-configured Kubernetes resources) to define, install, and
upgrade applications easily. Helm simplifies managing complex Kubernetes configurations and
deployments.
Q 93. What is 'Helm' in Kubernetes?
Q 90. What is a 'Systemd unit' in Linux?
Q 94. What is the 'rm' command in Linux?
Q 91. What is an image repository in Docker?
Q 92. What is the role of 'docker pull' in Docker?

Q 96. What is CI/CD in DevOps?
CI/CD (Continuous Integration/Continuous Deployment) is a set of DevOps practices aimed at
improving the software development process. Continuous Integration involves frequently
merging code into a shared repository, followed by automated testing. Continuous Deployment
automates the release process, allowing changes to be deployed to production automatically
once they pass testing.
Q 100. What is 'grep' used for in Linux?
Q 99. What is the role of 'docker exec'?
The "docker exec" command allows users to execute commands inside a running container. It
is typically used for debugging, testing, or administering containers. For example, "docker exec
-it container_name bash" opens an interactive shell session inside the specified container.
Q 98. What is the 'chown' command in Linux?
The "chown" command in Linux is used to change the ownership of files or directories. It allows
administrators to specify a new owner or group for a file. For example, "chown user:group
file.txt" changes the ownership of file.txt to the specified user and group.
Q 97. What is the significance of 'logrotate' in Linux?
"logrotate" is a Linux utility used to manage the size of log files by rotating, compressing, and
removing old logs. It helps prevent log files from consuming too much disk space and ensures
that logs are archived and kept for compliance or debugging purposes.
Q 95. What is the role of 'git merge' in version control?
The "git merge" command is used to combine changes from two branches in a Git repository. It
integrates the changes from the source branch into the target branch, keeping the commit
history intact. Merge conflicts may occur if the changes are incompatible, requiring manual
resolution.

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The "grep" command is used to search for a pattern within a file or input stream. It stands for
"Global Regular Expression Print" and is used to find matching lines in files. For example, "grep
'pattern' file.txt" searches for 'pattern' in file.txt and returns the matching lines.
In conclusion, preparing for Linux Interview Questions for DevOps will equip you with essential
skills to manage and automate infrastructure effectively. By mastering key concepts and
commands, you'll be well-prepared for roles in DevOps environments. These Linux interview
questions for DevOps serve as a valuable resource to ensure you're ready for any technical
challenge that comes your way.
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Conclusion

Linux Interview Questions PDF By ScholarHat

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