o9 Solutions 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. K8s fundamentals. Role of each component
Ans. 
Kubernetes (k8s) fundamentals and role of each component
• Kubelet - agent that runs on each node in the cluster and ensures containers are running

• Kube-proxy - network proxy that maintains network rules on nodes

• Kubernetes API server - central management entity that serves the Kubernetes API

• etcd - distributed key-value store used for storing cluster data

• Kube-controller-manager - runs controller processes to manage the stat...read more
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Q2. How can one troubleshoot the crashloop error in Kubernetes (k8s)?
Ans. 
Troubleshooting crashloop error in Kubernetes involves checking pod logs, examining resource limits, and verifying configuration files.
• Check pod logs to identify the cause of the crashloop.

• Examine resource limits to ensure the pod has enough resources to run.

• Verify configuration files for any errors or misconfigurations.

• Use kubectl commands like describe, logs, and exec to troubleshoot further.

• Consider checking for iss...read more
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1. Log parsing using python

Q1. What are inodes?
Ans. 
Inodes are data structures in Unix-like file systems that store metadata about files, such as permissions, ownership, and location.
• Inodes contain information about files, such as file size, permissions, timestamps, and pointers to data blocks.

• Each file in a Unix-like file system is represented by an inode.

• Inodes are used to efficiently locate and manage files on the file system.

• When a file is created, an inode is also ...read more
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Q2. How do you list all the files held by a process
Ans. 
Use the lsof command to list all files held by a process
• Use the lsof command followed by the -p flag and the process ID to list files held by a specific process

• For example, to list all files held by process ID 1234, run: lsof -p 1234

• You can also use the -c flag to specify a process name instead of ID, like: lsof -c chrome
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Q3. Container vs Virtaul Machines?
Ans. 
Containers are lightweight, portable, and efficient, while virtual machines are more isolated and resource-intensive.
• Containers share the host OS kernel, making them more lightweight and faster to start compared to VMs.

• VMs provide stronger isolation and security by running a separate OS instance for each VM.

• Containers are ideal for microservices architecture and rapid deployment, while VMs are better for running multip...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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Q1. Azure related questions
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Q2. DevOps related questions
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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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