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DevOps Interview Questions in Bangalore

36 practice questions with answers for DevOps interviews in Bangalore.

DevOps jobs in Bangalore

Bangalore (Bengaluru) is India's largest technology hub, with global product companies, engineering centres, unicorn start-ups and big IT-services campuses. Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds.

Below are 36 questions that match the mix of service, product and domain employers hiring junior devops engineers in Bangalore.

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01

Which AWS CLI commands do you commonly use?

AWS Cloud for DevOpsEasy
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aws configure aws sts get-caller-identity aws ec2 describe-instances \ --filters Name=instance-state-name,Values=running \ --query 'Reservations[].Instances[].[InstanceId,PrivateIpAddress]' --output table aws s3 cp build.zip s3://acme-artifacts/releases/ aws s3 sync ./site s3://acme-site --delete aws logs tail /aws/lambda/orders --follow get-caller-identity confirms which account and role you are using before you run anything risky.
02

Write a Prometheus alerting rule for a high error rate.

Monitoring, Logging and SREMedium
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groups: - name: api-alerts rules: - alert: HighErrorRate expr: | sum(rate(http_requests_total{job="api",status=~"5.."}[5m])) / sum(rate(http_requests_total{job="api"}[5m])) > 0.05 for: 10m labels: severity: page annotations: summary: "API error rate above 5 percent" runbook: "https://wiki.example.com/runbooks/api-errors" for: 10m ignores short spikes; Alertmanager routes by the severity label.
03

An Ansible playbook run against 100 servers failed on 7 of them. What do you do?

Infrastructure as Code (Terraform and Ansible)Medium
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Check the output and the retry file or failed host list to see the error on those hosts, for example unreachable SSH, a missing package repo or full disk. Fix the cause, then rerun only those hosts with --limit. Because tasks are idempotent, rerunning on successful hosts is also safe. For rolling changes, use serial and max_fail_percentage to stop early on failures.
04

How do you perform a rolling update and roll back a Deployment?

KubernetesMedium
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# update the image kubectl set image deployment/api api=registry.example.com/api:1.5.0 kubectl rollout status deployment/api # history and rollback kubectl rollout history deployment/api kubectl rollout undo deployment/api kubectl rollout undo deployment/api --to-revision=3 # pause or restart kubectl rollout pause deployment/api kubectl rollout restart deployment/api In GitOps setups, you change the image tag in Git instead and let Argo CD apply it.
05

What is Docker Compose?

Docker and ContainersEasy
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Docker Compose defines and runs multi-container applications from a YAML file, usually compose.yaml. You describe services, networks, volumes, environment variables and dependencies, then start everything with docker compose up. It is ideal for local development and testing, for example an API, database and cache together. For production orchestration across many hosts, teams use Kubernetes instead.
06

When do you use a StatefulSet instead of a Deployment?

KubernetesMedium
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Use a StatefulSet for stateful workloads such as databases, Kafka or Elasticsearch that need stable identity. Pods get fixed names like db-0 and db-1, start and stop in order, and each gets its own PersistentVolumeClaim that follows it after rescheduling. A headless service gives each pod a stable DNS name. Deployments treat pods as interchangeable, which suits stateless apps.
07

Tell me about a mistake you made in infrastructure work and what you learned.

Infrastructure as Code (Terraform and Ansible)Medium
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Situation: I applied a Terraform change that renamed a security group, which forced replacement and briefly cut access to a staging database. Task: fix it and prevent repeats. Action: I restored access quickly, explained it openly to my lead, and then added plan review in pull requests plus lifecycle create_before_destroy rules. Result: no similar outage since, and I now read every destroy line in a plan.
08

What is the difference between a process and a thread in Linux?

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A process is a running program with its own address space, file descriptors and PID. A thread is a unit of execution inside a process that shares the same memory and open files with other threads. Creating threads is cheaper and they communicate easily, but a bug in one thread can crash the whole process, while separate processes are isolated from each other.
09

A production server is very slow. How do you troubleshoot high CPU usage?

Linux and Shell ScriptingMedium
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Start with uptime and top or htop to see load and which processes use CPU. Check whether it is user, system or iowait time, and use pidstat or ps -eo pid,pcpu,cmd --sort=-pcpu for detail. For a Java process, take thread dumps; for others, use perf or strace. Correlate with recent deployments, cron jobs or traffic spikes before deciding to scale, roll back or fix code.
10

How do an Application Load Balancer and an Auto Scaling group work together?

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The Auto Scaling group launches EC2 instances from a launch template across several Availability Zones and keeps the count between min and max, scaling on policies such as target 60 percent CPU. It registers instances with the ALB's target group. The ALB spreads HTTP traffic across healthy targets, routes by path or host, and health checks let the group replace failed instances.
11

What is a multi-stage Docker build and why use it?

Docker and ContainersMedium
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A multi-stage build uses several FROM instructions in one Dockerfile. Early stages contain compilers and build tools to produce the artefact; the final stage starts from a small runtime image and copies only the built output with COPY --from. The result is a much smaller image with fewer vulnerabilities, because build tools, source code and caches never reach production.
12

How do you run a matrix build in GitHub Actions?

CI/CD PipelinesMedium
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jobs: test: runs-on: ${{ matrix.os }} strategy: fail-fast: false matrix: os: [ubuntu-latest, windows-latest] python: ['3.11', '3.12'] steps: - uses: actions/checkout@v4 - uses: actions/setup-python@v5 with: python-version: ${{ matrix.python }} - run: pip install -r requirements.txt - run: pytest This creates four parallel jobs; fail-fast false lets all finish so you see every failure.
13

A pod is in CrashLoopBackOff. How do you troubleshoot it?

KubernetesMedium
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The container starts and keeps crashing, and Kubernetes waits longer between restarts. Run kubectl describe pod to see events and exit codes, and kubectl logs <pod> --previous for the crashed container's output. Common causes are missing environment variables or secrets, bad config, failing database connections, a wrong command, an aggressive liveness probe, or exit code 137 meaning OOM kill.
14

What is the difference between declarative and imperative IaC, and between Terraform and Ansible?

Infrastructure as Code (Terraform and Ansible)Medium
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Declarative tools describe the end state and the tool works out the steps; imperative tools describe the steps. Terraform is declarative, keeps a state file and is best at provisioning cloud resources. Ansible is procedural with mostly idempotent modules, agentless over SSH, and best at configuring servers and deploying software. Many teams use Terraform to create VMs and Ansible to configure them.
15

What is Site Reliability Engineering, and what is toil?

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SRE, which began at a large search company, applies software engineering to operations: teams own reliability through SLOs, error budgets, automation, incident management and capacity planning. Toil is manual, repetitive, automatable work that grows with scale and adds no lasting value, such as manually restarting services. SRE teams aim to keep toil below about half their time and automate the rest.
16

Explain liveness, readiness and startup probes.

KubernetesMedium
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A liveness probe checks whether the container is healthy; if it fails, the kubelet restarts it. A readiness probe checks whether it can serve traffic; if it fails, the pod is removed from service endpoints but not restarted. A startup probe gives slow-starting apps time to boot and holds off the other probes until it succeeds. Wrong liveness probes can cause restart loops.
17

What are the S3 storage classes and lifecycle policies?

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S3 Standard is for frequently accessed data. Standard-IA and One Zone-IA are cheaper for infrequent access but charge retrieval fees. Intelligent-Tiering moves objects automatically based on access. Glacier Instant, Flexible Retrieval and Deep Archive are for archives with slower, cheaper access. Lifecycle rules move objects between classes after a set age and delete old versions or logs automatically.
18

How do you find files larger than 100 MB and older than 7 days under /var/log?

Linux and Shell ScriptingMedium
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find /var/log -type f -size +100M -mtime +7 -exec ls -lh {} + # compress them instead of just listing find /var/log -type f -size +100M -mtime +7 -exec gzip {} + -size +100M matches files above 100 MB, -mtime +7 means modified more than 7 days ago, and -exec with + passes many files to one command call, which is faster than running it once per file.
19

What are zombie and orphan processes?

Linux and Shell ScriptingMedium
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A zombie is a process that has exited but whose parent has not yet read its exit status with wait(), so it still holds a PID entry and shows state Z. An orphan is a running process whose parent died; it is adopted by PID 1, which reaps it later. Many zombies indicate a buggy parent; fixing or restarting the parent clears them.
20

Explain the main components of an AWS VPC.

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A VPC is your private network with a CIDR range like 10.0.0.0/16. It is split into subnets in each Availability Zone. Public subnets have a route to an Internet Gateway; private subnets reach the internet only through a NAT Gateway in a public subnet. Route tables control traffic, security groups and NACLs filter it, and VPC endpoints give private access to services like S3.
21

What makes a good alert, and how do you avoid alert fatigue?

Monitoring, Logging and SREHard
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A good alert is actionable, urgent and tied to user impact, such as an SLO burn rate, not just high CPU. Each page should have a runbook link and a clear owner. Reduce noise by removing alerts nobody acts on, using severity levels so non-urgent issues create tickets, grouping related alerts, and using for durations to ignore short spikes. Review alerts after each on-call week.
22

How do you keep yourself updated with new DevOps tools and practices?

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I follow official release notes for tools I use, such as Kubernetes and Terraform, and read a few engineering blogs and CNCF updates weekly. I learn by doing, so I try new tools in a small home lab or free cloud tier before suggesting them. I also prepare for certifications to structure my learning, and share short notes with my team.
23

How does the Horizontal Pod Autoscaler work?

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The HPA periodically reads metrics from the metrics server or a custom metrics adapter and changes the replica count of a Deployment or StatefulSet to keep a target, for example 70 percent average CPU. It calculates desired replicas from current usage divided by the target, within min and max bounds, with stabilisation windows to avoid flapping. CPU-based HPA needs resource requests set.
24

What is the difference between a Pod, a ReplicaSet and a Deployment?

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A Pod is the smallest deployable unit: one or more containers sharing network and storage. A ReplicaSet keeps a specified number of identical pods running. A Deployment manages ReplicaSets and adds rolling updates and rollbacks by creating a new ReplicaSet for each version. In practice you create Deployments and rarely touch ReplicaSets or bare pods directly.
25

What is Kubernetes and why do companies use it?

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Kubernetes is an open-source container orchestration platform. You declare the desired state, such as five replicas of an API, and it schedules containers across nodes, restarts failed ones, scales them, balances traffic and rolls out updates. Companies use it to run many microservices reliably on shared infrastructure, on any cloud or on-premises, through managed services like EKS, AKS and GKE.
26

What is the difference between a ConfigMap and a Secret?

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Both inject configuration into pods as environment variables or mounted files, keeping config out of images. ConfigMaps hold non-sensitive data like URLs and feature flags. Secrets hold sensitive values like passwords and tokens; they are only base64 encoded by default, so you should enable encryption at rest, restrict access with RBAC, or use an external secrets manager.
27

How do you create an EKS cluster with eksctl and connect kubectl to it?

AWS Cloud for DevOpsMedium
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eksctl create cluster \ --name shop-dev \ --region ap-south-1 \ --nodegroup-name workers \ --node-type t3.medium \ --nodes 2 --nodes-min 2 --nodes-max 5 \ --managed aws eks update-kubeconfig --name shop-dev --region ap-south-1 kubectl get nodes eksctl builds CloudFormation stacks for the VPC, control plane and node group. In production, teams usually manage EKS with Terraform modules instead.
28

How do you squash your last three commits into one?

Git and Version ControlMedium
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git rebase -i HEAD~3 # in the editor, keep the first line as pick # and change the other two to squash (or s) pick a1b2c3 Add login API squash d4e5f6 Fix typo squash 789abc Add tests # alternative without the editor git reset --soft HEAD~3 git commit -m "Add login API with tests" If the branch was already pushed, update it with git push --force-with-lease.
29

How do you count unique client IP addresses in an nginx access log?

Linux and Shell ScriptingMedium
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awk '{print $1}' /var/log/nginx/access.log | sort | uniq -c | sort -rn | head -10 # total number of unique IPs awk '{print $1}' access.log | sort -u | wc -l The first field in the default log format is the client IP. uniq -c only collapses adjacent lines, so sort must run before it; the final sort -rn shows the busiest IPs first.
30

Tell me about a time you automated a repetitive manual task.

Linux and Shell ScriptingMedium
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Situation: our team manually cleaned old build artefacts on shared servers every week, which took two hours and sometimes deleted the wrong files. Task: I offered to automate it. Action: I wrote a bash script with dry-run mode, logging and a retention rule, tested it on staging and scheduled it with cron. Result: zero manual effort and no more full-disk alerts for six months.
31

How do you build and push a Docker image from a pipeline?

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# shell steps in any CI tool IMAGE=registry.example.com/shop/api TAG=$(git rev-parse --short HEAD) echo "$REG_PASS" | docker login registry.example.com -u "$REG_USER" --password-stdin docker build -t $IMAGE:$TAG . docker push $IMAGE:$TAG Tag with the commit SHA so each image is traceable and immutable; avoid relying on latest. Credentials come from the CI secret store, and --password-stdin keeps them out of process lists.
32

You are the incident commander for a major outage. What do you do?

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Declare the incident, open a channel and bridge, and assign roles: someone to investigate, someone to communicate and a scribe. My job is to coordinate, not to debug. Prioritise mitigation over root cause, such as rollback, failover or feature flags. Post regular status updates to stakeholders. After recovery, confirm it is stable, close it and schedule a blameless post-mortem with action items.
33

What is remote state and state locking in Terraform?

Infrastructure as Code (Terraform and Ansible)Medium
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Remote state stores the state file in a shared backend such as an S3 bucket, Azure Storage or Terraform Cloud, so the whole team and CI use the same state. Locking prevents two runs from changing state at the same time, avoiding corruption; on S3 it uses a lock file or a DynamoDB table. Enable versioning and encryption on the backend for recovery and security.
34

Explain the Kubernetes architecture.

KubernetesMedium
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The control plane has the kube-apiserver, the front door for all requests; etcd, the key-value store holding cluster state; the scheduler, which places pods on nodes; and the controller manager, which runs reconciliation loops. Each worker node runs the kubelet, which starts and monitors pods; kube-proxy, which handles service networking; and a container runtime such as containerd.
35

Write Terraform code to create an AWS EC2 instance.

Infrastructure as Code (Terraform and Ansible)Medium
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terraform { required_providers { aws = { source = "hashicorp/aws", version = "~> 5.0" } } } provider "aws" { region = "ap-south-1" } resource "aws_instance" "web" { ami = var.ami_id instance_type = "t3.micro" subnet_id = var.subnet_id tags = { Name = "web-server" Env = "dev" } } Run terraform init, plan and apply. ap-south-1 is the Mumbai region.
36

What are Terraform modules?

Infrastructure as Code (Terraform and Ansible)Medium
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A module is a reusable folder of Terraform files with input variables and outputs, for example a vpc module or an eks-cluster module. The root module calls child modules with different values for each environment. Modules reduce duplication and enforce standards across teams. They can come from local paths, Git or the Terraform Registry and should be pinned to versions.

Companies with offices in Bangalore (20)

IT services

TCS

DevOps interview questions

  • 30 questions
  • 4 rounds

Mumbai, Chennai, Pune +2

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IT services

Infosys

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Mysuru, Pune +2

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IT services

Wipro

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad, Pune +2

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Consulting

Accenture

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad, Pune +2

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IT services

Cognizant

DevOps interview questions

  • 30 questions
  • 4 rounds

Chennai, Bengaluru, Pune +2

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IT services

Capgemini

DevOps interview questions

  • 30 questions
  • 4 rounds

Mumbai, Bengaluru, Pune +2

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IT services

HCLTech

DevOps interview questions

  • 30 questions
  • 4 rounds

Noida, Chennai, Bengaluru +2

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IT services

Tech Mahindra

DevOps interview questions

  • 30 questions
  • 4 rounds

Pune, Hyderabad, Bengaluru +2

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IT services

IBM

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Pune, Hyderabad +2

View questions
Product

Amazon

DevOps interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad, Chennai +2

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Product

Microsoft

DevOps interview questions

  • 30 questions
  • 5 rounds

Hyderabad, Bengaluru, Noida +2

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E-commerce & consumer tech

Flipkart

DevOps interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad

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E-commerce & consumer tech

Swiggy

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad

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Fintech

Razorpay

DevOps interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Mumbai

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Fintech

PhonePe

DevOps interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Pune

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Consulting

Thoughtworks

DevOps interview questions

  • 30 questions
  • 5 rounds

Pune, Bengaluru, Chennai +2

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Product

Red Hat

DevOps interview questions

  • 30 questions
  • 4 rounds

Pune, Bengaluru

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Product

Nutanix

DevOps interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Pune

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Banking & finance

JP Morgan Chase

DevOps interview questions

  • 30 questions
  • 5 rounds

Mumbai, Bengaluru, Hyderabad

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Product

Freshworks

DevOps interview questions

  • 30 questions
  • 5 rounds

Chennai, Bengaluru, Hyderabad

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Frequently asked questions

Which companies hire DevOps professionals in Bangalore?

Companies with large offices in Bangalore include TCS, Infosys, Wipro, Accenture, Cognizant, Capgemini, HCLTech, Tech Mahindra, IBM, Amazon. Use their company pages below to practise employer-specific sets.

Are DevOps interviews in Bangalore different from other cities?

The questions depend more on the company than the city. Bangalore's mix of employers decides the style: Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds

How do I find DevOps jobs in Bangalore?

Shortlist companies with Bangalore offices, keep your CV focused on DevOps projects, apply on company career pages and job portals with the Bangalore filter, and practise the questions on this page before each interview.

Other cities

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