Hitachi Digital Services Senior Devops Engineer Interview Questions and Answers

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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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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Data Structure related questions

Q1. Java related interview questions
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Q1. Tell me about yourself.
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