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DevOps interview questions #13

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86 changes: 27 additions & 59 deletions 1_COMPANYWISE_REAL_INTERVIEW_QA/68.29_July_2026.md
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### Can you introduce yourself?
# DevOps Interview Questions

### Which AWS services are you most familiar with?

### If you are asked to block traffic from a particular IP, how would you do it in your current environment?
### if you are asked to like block traffic from a particular IP how do you do it?

### What will you do to block a particular IP address using AWS Network ACLs?
### have you worked on Kubernetes also, Mahesh?

### Have you worked on Kubernetes?
### How many clusters have you managed in the past?

### How many Kubernetes clusters have you managed in the past?
### How many services you had in that cluster approximately?

### How many services did you have in your Kubernetes cluster approximately?
### How are you exposing those micro services? What is the type of services that you have used?

### How are you exposing those microservices?
### Which ingress controller you have used?

### Which types of Kubernetes Services have you used?
### For how many services in your cluster you had load balancer as the service type?

### Which Ingress Controller have you used?
### Where do we mention that parameter?

### For how many services in your cluster did you have LoadBalancer as the service type?
### What is the exact word?

### In the Deployment YAML manifest, where do you specify the number of pods you want to run for an application?
### What is crash loop back off state and how do you troubleshoot it and fix it?

### What is the exact parameter used to specify the number of replicas?
### How do you fix this error out of memory?

### If you see some pods in the CrashLoopBackOff state, what is CrashLoopBackOff and how do you troubleshoot and fix it?
### And for image pull back off.

### How do you fix an OutOfMemory error in Kubernetes?
### How would you remove a particular part from receiving traffic?

### What is ImagePullBackOff and what are the common reasons for it?
### How would you manually go and do that?

### How do you resolve an ImagePullBackOff error?
### What are like HTTP status quotes and what are forex status quotes?

### How would you remove a particular pod from receiving traffic while keeping the pod running in the cluster?
### let's say you have a application load balancer and you have the target group behind it and you are seeing 503 error for your application What could have happened?

### How would you manually remove a pod from receiving traffic?
### In Cloudwatch, which services have you used?

### Have you worked with Prometheus and Grafana?
### You are aware of querying application logs through Logs Insights?

### What are HTTP status codes and what are 4xx status codes?
### If you are asked to query the application logs using Cloudwatch Logs insights will you be able to do?

### Suppose you have an Application Load Balancer with a target group behind it and you are seeing a 503 error. What could have happened?
### Have you ever used Athena in AWS Athena service?

### How would you troubleshoot a 503 error from an Application Load Balancer?
### Have you used Cloud Trial For what purpose?

### In CloudWatch, which services or features have you used?
### What is Vertical Pod Autoscaling?

### Are you aware of querying application logs using CloudWatch Logs Insights?
### The current disk utilization check what command?

### If you are asked to query application logs using CloudWatch Logs Insights, will you be able to do it?
### The disk utilization is almost 90% or 90% or more and you want to delete some files to increase the disk space. So how would you first locate the directory Which is taking more disk space?

### Have you ever used AWS Athena?
### What are the tools and technologies that you are using in your organization?

### Have you used AWS CloudTrail?

### What purpose have you used AWS CloudTrail for?

### How do you perform Vertical Pod Autoscaling in Kubernetes?

### How do you perform Horizontal Pod Autoscaling in Kubernetes?

### In a Horizontal Pod Autoscaler configuration, which fields control the minimum and maximum number of replicas?

### What is Prometheus used for?

### What is Grafana used for?

### How do you monitor Kubernetes metrics using Prometheus and Grafana?

### How would you identify errors in a Kubernetes application?

### What is Terraform remote state?

### Why do you use an S3 bucket and DynamoDB locking mechanism for Terraform remote state?

### What is the purpose of state locking in Terraform?

### How do you check current disk utilization in Linux?

### Which command do you use to check disk utilization?

### If disk utilization reaches 90% or more, how would you find which directory is consuming the most disk space?

### Which Linux commands would you use to identify large directories or files?

### What would you do with files that are consuming unnecessary disk space?
### If I select for this role, what will be the roles and responsibilities of mine?