Walmart Senior Devops Engineer Interview Questions and Answers

DSA, Hashmaps, Arrays and String Manipulation

Q1. What are terraform modules
Ans. 
Terraform modules are reusable components that can be used to create infrastructure resources.
• Modules are collections of .tf files that define resources and their dependencies

• They can be used to create reusable infrastructure code

• Modules can be published to the Terraform Registry for others to use

• They can be used to create complex infrastructure setups easily
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Q1. Mostly Cloud related questions
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Q1. If round 1 is clear , then be confident in round 2
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Q1. Salary related mainly
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Q1. What is ipconf.pl?
Ans. 
ipconf.pl is a Perl script used for configuring network interfaces on Linux systems.
• ipconf.pl is typically used to set up IP addresses, netmasks, gateways, and DNS servers on Linux machines.

• It can be used to automate the configuration of network interfaces during system setup or maintenance.

• The script may also be used to troubleshoot network connectivity issues by checking and modifying network settings.

• ipconf.pl is of...read more
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Q2. What is the difference between scan vip & node vip?
Ans. 
Scan VIP is used for load balancing traffic to multiple nodes, while Node VIP is assigned to a specific node for direct access.
• Scan VIP is a virtual IP address used for load balancing traffic across multiple nodes in a cluster.

• Node VIP is a virtual IP address assigned to a specific node in the cluster for direct access.

• Scan VIP is typically used for services that need to be highly available and distributed across multi...read more
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Q1. What is quarantile in Exadata?
Ans. 
Quarantile in Exadata is a feature that isolates problematic cells to prevent them from affecting the rest of the system.
• Quarantile is a feature in Exadata that identifies and isolates cells that are experiencing issues or failures.

• It helps prevent the spread of issues to other cells in the system, ensuring high availability and performance.

• Quarantiled cells are still accessible for diagnosis and maintenance, but are n...read more
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Q2. How to identify the master switch in Exadata?
Ans. 
The master switch in Exadata can be identified by checking the status of the cell server software.
• Check the status of the cell server software using the 'cellcli' command

• The cell server with the 'MS' role is the master switch

• The master switch can also be identified by checking the 'cellinit.ora' file
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Q3. What is spine switch & leaf switch in exadata?
Ans. 
Spine switch and leaf switch are networking components in Exadata used for connecting database servers and storage servers.
• Spine switch acts as the core of the network, connecting all leaf switches and providing high-speed connectivity.

• Leaf switches connect database servers and storage servers to the spine switch, facilitating communication between them.

• Exadata uses a leaf-spine network architecture for efficient data ...read more
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One of the node of a 3 node cluster is down. Explain the step by step process to troubleshoot the issue.

Shell script & terraform code output was asked.

Q1. Describe CI/CD and Jenkins set up
Ans. 
CI/CD is a software development practice where code changes are automatically built, tested, and deployed.
• Continuous Integration (CI) involves automatically building and testing code changes frequently.

• Continuous Deployment (CD) involves automatically deploying code changes to production.

• Jenkins is a popular open-source automation server used for CI/CD pipelines.

• Jenkins pipelines are defined using a Jenkinsfile which s...read more
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Q2. Define Kebernetes architecture
Ans. 
Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications.
• Kubernetes follows a master-slave architecture with a master node controlling multiple worker nodes.

• Master node components include API server, scheduler, controller manager, and etcd.

• Worker node components include kubelet, kube-proxy, and container runtime (e.g. Docker).

• Kubernet...read more
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Q1. Related to cloud
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Q2. Related to CICD
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Q1. Questions on Cloud, Kubernetes and ADO
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It was a DevOps MCQ test for 30min that consists of 50 questions.

Q1. It was a technical round where questions were asked as per the technologies mentioned in your resume.
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