Siemens Devops Engineer Interview Questions and Answers

Its a aptitude test and mode was online

Q1. Sorting methods
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Q2. Given random numbers and wanted to find sum of max 2 numbers is greater than 100 or not
Ans. 
Check if the sum of the two largest numbers in an array exceeds 100.
• Sort the array in descending order.

• Select the first two elements (largest numbers).

• Calculate their sum and compare it to 100.

• Example: For [10, 50, 60, 5], max numbers are 60 and 50, sum is 110 > 100.

• Example: For [20, 30, 40], max numbers are 40 and 30, sum is 70 < 100.
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Round duration - 60 Minutes
Round difficulty - Medium

This round started with some basic questions from DevOps followed by some more questions from Docker and Linux.

Q1. What is Continuous Testing (CT)?
Ans. 
Continuous Testing (CT) is the process of executing automated tests as part of the software delivery pipeline to obtain immediate feedback on the business risks associated with a software release candidate.
• CT helps in identifying defects early in the development cycle.

• It ensures that the software is always in a releasable state.

• CT integrates testing into the CI/CD pipeline for faster feedback loops.

• Examples include run...read more
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Q2. How does AWS contribute to DevOps?
Ans. 
AWS provides a wide range of services and tools that support the principles and practices of DevOps.
• AWS offers infrastructure as code tools like CloudFormation and Terraform for automating the provisioning of resources.

• AWS provides a variety of monitoring and logging services such as CloudWatch and CloudTrail to help with continuous monitoring and feedback loops.

• AWS supports continuous integration and continuous deploy...read more
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Q3. What is a Docker image registry?
Ans. 
A Docker image registry is a repository for storing and managing Docker images.
• It allows users to push and pull Docker images to and from the registry.

• Popular Docker image registries include Docker Hub, Amazon ECR, and Google Container Registry.

• Registries can be public or private, with private registries requiring authentication for access.
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Q4. How many components are there in Docker?
Ans. 
Docker has 3 main components: Docker Engine, Docker Images, and Docker Containers.
• Docker Engine is the core component responsible for running and managing Docker containers.

• Docker Images are read-only templates used to create Docker containers.

• Docker Containers are lightweight, standalone, and executable packages that include everything needed to run a piece of software.
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Q5. Can you describe the lifecycle of a Docker container?
Ans. 
The lifecycle of a Docker container involves creation, running, pausing, restarting, and stopping.
• 1. Creation: A Docker container is created from a Docker image using the 'docker run' command.

• 2. Running: The container is started and runs the specified application or service.

• 3. Pausing: The container can be paused using the 'docker pause' command, which temporarily stops its processes.

• 4. Restarting: The container can be...read more
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Q6. What is LVM and why is it required?
Ans. 
LVM stands for Logical Volume Manager, used to manage disk space efficiently by allowing for dynamic resizing of volumes.
• LVM allows for easy resizing of volumes without the need to unmount the filesystem

• It provides features like snapshots, striping, mirroring, and thin provisioning

• LVM can span multiple physical disks to create a single logical volume
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Q7. What is load average in Linux?
Ans. 
Load average in Linux is a measure of system activity, indicating the average number of processes waiting for CPU time over a period of time.
• Load average is displayed as three numbers representing the average load over the last 1, 5, and 15 minutes.

• A load average of 1.0 means the system is at full capacity, while a load average of 0.5 means the system is half as busy.

• High load averages may indicate that the system is o...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This round started with me first giving a brief intro about my experience in the DevOps sector and then the interviewer switched to asking me questions about Git , Docker and Kubernetes.

Q1. What is the command used to delete a branch in Git?
Ans. 
The command used to delete a branch in Git is 'git branch -d <branch_name>'.
• Use 'git branch -d <branch_name>' to delete a branch in Git.

• Make sure to switch to a different branch before deleting the branch.

• If the branch has not been merged, use 'git branch -D <branch_name>' to force delete.
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Q2. What do you know about git reflog?
Ans. 
Git reflog is a reference log that records changes to the HEAD of the repository.
• Records all changes to the HEAD reference

• Useful for recovering lost commits or branches

• Can be accessed using 'git reflog' command
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Q3. What is the difference between git revert and git reset?
Ans. 
git revert undoes a specific commit by creating a new commit, while git reset moves the HEAD to a previous commit without creating a new commit.
• git revert creates a new commit that undoes a specific commit, keeping the commit history intact

• git reset moves the HEAD to a previous commit, potentially discarding changes made after that commit

• git revert is safer for shared branches as it does not rewrite history, while git ...read more
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Q4. Can you explain the difference between CMD and ENTRYPOINT in Docker?
Ans. 
CMD specifies the default command to run in the container, while ENTRYPOINT specifies the executable to run when the container starts.
• CMD is often used to provide default arguments for the ENTRYPOINT command

• ENTRYPOINT is used to specify the executable that will run when the container starts

• CMD can be overridden at runtime by passing arguments to docker run command

• ENTRYPOINT cannot be overridden at runtime, but can be c...read more
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Q5. How can you monitor a Kubernetes cluster?
Ans. 
Monitoring a Kubernetes cluster involves using tools like Prometheus, Grafana, and Kubernetes Dashboard.
• Use Prometheus for collecting metrics from Kubernetes components and applications running on the cluster.

• Set up Grafana for visualizing the collected metrics and creating dashboards for monitoring.

• Utilize Kubernetes Dashboard for a graphical interface to view and manage the cluster resources.

• Implement alerts and noti...read more
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Q6. What is Kubernetes Load Balancing?
Ans. 
Kubernetes Load Balancing is a method to distribute incoming network traffic across multiple pods in a Kubernetes cluster.
• Kubernetes Load Balancer service type automatically creates a cloud provider load balancer.

• It helps in scaling applications by distributing traffic evenly across multiple pods.

• Load balancing ensures high availability and reliability of applications running in a Kubernetes cluster.
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Q7. Can you explain the architecture of Jenkins?
Ans. 
Jenkins is an open-source automation server that helps to automate the non-human part of the software development process.
• Jenkins is a Java-based application that runs in a servlet container like Apache Tomcat.

• It can be installed on a single server or distributed across multiple servers for scalability.

• Jenkins uses plugins to extend its functionality, allowing integration with various tools and technologies.

• It follows ...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions.

Q1. Can you tell me something about yourself?
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Q2. Why should we hire you?
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