Showing posts with label Programming. Show all posts
Showing posts with label Programming. Show all posts

19 January 2026

#Spark Core

#Spark Core

Key Concepts


S.No Topic Sub-Topics

Interview question


Related Topics


   SparkContext   
   Components   
   DAG   
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11 January 2026

#Scikit

#Scikit

Key Concepts


S.No Topic Sub-Topics
1Scikit-learnWhat is scikit-learn, Installation, Key features, ML workflow, Supported algorithms
2Scikit-learn API BasicsEstimators, fit(), predict(), transform(), Pipelines, Model persistence
3Data Loading & InspectionBuilt-in datasets, load_*, fetch_*, Data shapes, Feature names, Target variables
4Data PreprocessingScaling, Normalization, Encoding categorical data, Missing values, Feature transformation
5Feature Scaling TechniquesStandardScaler, MinMaxScaler, RobustScaler, Normalizer, When to scale
6Handling Missing DataSimpleImputer, Strategies, Missing indicators, Pipeline usage, Best practices
7Encoding Categorical VariablesLabelEncoder, OneHotEncoder, OrdinalEncoder, Handling unknowns, Sparse output
8Train-Test Splittrain_test_split, Stratification, Random state, Data leakage, Validation sets
9Linear RegressionLinearRegression, Assumptions, Coefficients, Evaluation metrics, Use cases
10Logistic RegressionBinary vs multiclass, Regularization, Solver options, Class weights, Evaluation
11Model Evaluation MetricsAccuracy, Precision, Recall, F1-score, Confusion matrix
12Cross-ValidationK-Fold, StratifiedKFold, cross_val_score, cross_validate, Bias-variance tradeoff
13k-Nearest NeighborsKNN classifier, KNN regressor, Distance metrics, Choosing K, Performance
14Support Vector MachinesSVC, SVR, Kernels, Hyperparameters, Margin maximization
15Decision TreesTree structure, Gini vs entropy, Overfitting, Pruning, Feature importance
16Ensemble LearningBagging, Boosting, Random Forest, Extra Trees, Voting classifiers
17Random ForestRandomForestClassifier, Hyperparameters, Feature importance, OOB score, Use cases
18Gradient BoostingGradientBoosting, XGBoost intro, LightGBM intro, Learning rate, Trees depth
19Naive BayesGaussianNB, MultinomialNB, BernoulliNB, Assumptions, Applications
20Clustering AlgorithmsKMeans, Hierarchical clustering, DBSCAN, Silhouette score, Use cases
21Dimensionality ReductionPCA, Kernel PCA, Explained variance, Feature compression, Visualization
22Anomaly DetectionIsolation Forest, One-Class SVM, LOF, Use cases, Evaluation challenges
23Model Selection & TuningGridSearchCV, RandomizedSearchCV, Hyperparameters, Scoring, Best estimators
24Pipelines & ColumnTransformerPipeline, Feature unions, ColumnTransformer, End-to-end ML, Avoid leakage
25Imbalanced DatasetsClass imbalance, SMOTE, Class weights, Evaluation metrics, Best practices
26Text Feature ExtractionCountVectorizer, TF-IDF, N-grams, Stop words, Sparse matrices
27Model Persistencejoblib, pickle, Saving models, Loading models, Versioning
28Model InterpretationCoefficients, Feature importance, Permutation importance, Partial dependence, SHAP intro
29Scikit-learn with Pipelines in ProductionReproducibility, Monitoring, Data drift, Model updates, Best practices
30Scikit-learn Best PracticesCode structure, Experiment tracking, Documentation, Common pitfalls, Next steps

Interview question

Basic Level

  1. What is scikit-learn?
  2. What type of library is scikit-learn?
  3. Which language is scikit-learn written in?
  4. What are estimators in scikit-learn?
  5. What is the fit() method?
  6. What is the predict() method?
  7. Difference between fit() and transform()?
  8. What is supervised learning?
  9. What is unsupervised learning?
  10. What is train_test_split?
  11. What are features and labels?
  12. What is a dataset in scikit-learn?
  13. What are built-in datasets?
  14. What is accuracy score?
  15. What is a confusion matrix?
  16. What is overfitting?
  17. What is underfitting?
  18. What is a regression problem?
  19. What is a classification problem?
  20. What is clustering?
  21. What is scaling?
  22. What is normalization?
  23. What is LabelEncoder?
  24. What is OneHotEncoder?
  25. What are model parameters?

Intermediate Level

  1. What is StandardScaler?
  2. Difference between MinMaxScaler and StandardScaler?
  3. What is logistic regression?
  4. Explain linear regression in scikit-learn.
  5. What is KNN?
  6. How does KNN work?
  7. What is SVM?
  8. What are kernels in SVM?
  9. What is decision tree?
  10. What is entropy and gini index?
  11. What is Random Forest?
  12. What is ensemble learning?
  13. What is cross-validation?
  14. What is K-Fold cross-validation?
  15. What is StratifiedKFold?
  16. What is GridSearchCV?
  17. What is RandomizedSearchCV?
  18. What are hyperparameters?
  19. What is bias-variance tradeoff?
  20. What is ROC curve?
  21. What is AUC?
  22. What is precision and recall?
  23. What is F1-score?
  24. What is feature importance?
  25. What is PCA?

Advanced Level

  1. How does PCA work internally?
  2. What is explained variance?
  3. Difference between PCA and LDA?
  4. What is Gradient Boosting?
  5. Difference between Bagging and Boosting?
  6. What is AdaBoost?
  7. What is Isolation Forest?
  8. What is DBSCAN?
  9. How does KMeans clustering work?
  10. What is silhouette score?
  11. What is feature selection?
  12. Difference between feature selection and extraction?
  13. What is Recursive Feature Elimination?
  14. What is pipeline in scikit-learn?
  15. Why are pipelines important?
  16. What is ColumnTransformer?
  17. How to handle categorical features?
  18. How does scikit-learn handle missing values?
  19. What is SimpleImputer?
  20. What is model persistence?
  21. Difference between pickle and joblib?
  22. What is partial dependence plot?
  23. What is permutation importance?
  24. How to avoid data leakage?
  25. How to handle imbalanced datasets?

Expert Level

  1. How does scikit-learn architecture work?
  2. Explain estimator, transformer, predictor design.
  3. How does scikit-learn optimize performance?
  4. What is warm_start?
  5. How does scikit-learn use NumPy internally?
  6. What are sparse matrices?
  7. How does scikit-learn handle sparse data?
  8. What is SGDClassifier?
  9. Difference between batch and online learning?
  10. How to scale scikit-learn for large datasets?
  11. What are limitations of scikit-learn?
  12. Difference between scikit-learn and TensorFlow?
  13. Difference between scikit-learn and PyTorch?
  14. How to integrate scikit-learn with pandas?
  15. What is custom estimator?
  16. How to implement custom transformer?
  17. What is scoring parameter?
  18. How to evaluate regression models?
  19. What is R² score?
  20. What is model drift?
  21. How to monitor models in production?
  22. What is reproducibility in ML?
  23. How to set random_state?
  24. Explain numerical stability issues.
  25. What are best practices in scikit-learn?

Related Topics


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04 May 2024

#SOAP

#SOAP

Key Concepts


S.No Topic Sub-Topics
1 Introduction to SOAP What is SOAP?, History of SOAP, SOAP vs REST, Use cases, Advantages and limitations
2 SOAP Architecture SOAP message structure, Envelope, Header, Body, Fault element
3 XML Basics for SOAP XML syntax, Elements and attributes, Namespaces, Schema definitions (XSD), Validation
4 WSDL Overview What is WSDL?, Structure of WSDL, Types, Messages, Port and binding
5 SOAP Message Exchange Request-response pattern, RPC style, Document style, Message flow, Example SOAP message
6 SOAP Fault Handling Fault structure, Faultcode, Faultstring, Faultactor, Detail element
7 SOAP Headers Purpose of headers, Adding headers, Role of headers, Security headers, Processing headers
8 SOAP Bindings HTTP binding, SMTP binding, JMS binding, RPC vs Document binding, Encoding styles
9 SOAP with Java JAX-WS overview, Creating web service, Endpoint interface, Implementation class, Deployment
10 SOAP with Spring Spring-WS introduction, Configuration, Endpoint mapping, Message handling, Security integration
11 Creating SOAP Clients Using wsimport, Dynamic client, Stubs and proxies, Consuming services, Handling responses
12 SOAP Message Structure Deep Dive Envelope details, Header examples, Body examples, Namespaces usage, Complex types
13 Data Types in SOAP Primitive types, Complex types, Arrays, Custom objects, XSD mapping
14 SOAP Security WS-Security overview, UsernameToken, Signature, Encryption, Security policies
15 Transport Protocols HTTP/HTTPS, SMTP, JMS, TCP, Reliability considerations
16 SOAP Attachments MTOM overview, SwA, Sending binary data, Receiving attachments, Use cases
17 SOAP Fault Handling in Java SOAPFaultException, Throwing faults, Custom fault details, Handling in clients, Best practices
18 Versioning in SOAP SOAP 1.1 vs 1.2, Message compatibility, WSDL versioning, Deprecation strategy, Backward compatibility
19 Testing SOAP Services SOAP UI, Postman, Unit testing with JUnit, Mock services, Integration testing
20 Error Handling Best Practices SOAP faults, Logging errors, Retry mechanisms, Exception mapping, Client notification
21 Advanced WSDL Concepts Importing WSDLs, Types section, PortType details, Binding options, Service definitions
22 SOAP Interoperability Cross-platform communication, Java & .NET interoperability, Version handling, Data type mapping, Testing
23 SOAP and REST Comparison Differences, Use cases, Performance considerations, Security differences, Choosing between SOAP and REST
24 Logging and Monitoring SOAP message logging, Auditing, Monitoring tools, Error tracking, Analytics
25 SOAP in Enterprise Applications Integration patterns, ESB usage, Legacy system integration, Transaction handling, Security considerations
26 SOAP Best Practices Design guidelines, Reusable WSDLs, Versioning, Error handling, Security
27 SOAP Performance Optimization Message size reduction, MTOM usage, Connection pooling, Caching, Load balancing
28 SOAP with Legacy Systems Integration challenges, Wrapping legacy APIs, Adapter design, Testing legacy services, Security considerations
29 SOAP Projects & Labs Hands-on exercises, Creating services, Consuming services, Security implementation, Testing scenarios
30 SOAP Certification & Career Path Industry relevance, Certifications, Advanced topics, Real-time project examples, Learning resources

Interview question

Basic

  1. What is SOAP?
  2. What does SOAP stand for?
  3. What is the main purpose of SOAP in web services?
  4. Explain the SOAP message structure.
  5. What are the main parts of a SOAP message?
  6. What is the SOAP Envelope element?
  7. What is the SOAP Header used for?
  8. What is the SOAP Body used for?
  9. What is the SOAP Fault element?
  10. What transport protocols can SOAP use?
  11. What is the difference between SOAP and REST?
  12. What is XML in the context of SOAP?
  13. Is SOAP platform independent? Explain.
  14. What is WSDL in SOAP web services?
  15. What are SOAP bindings?
  16. What is the role of UDDI in SOAP?
  17. What are the advantages of SOAP over REST?
  18. What are the disadvantages of SOAP?
  19. What is the SOAP action in HTTP headers?
  20. What data format does SOAP use?
  21. Can SOAP work without WSDL?
  22. What is a SOAP client?
  23. What is a SOAP server?
  24. What is the default port for SOAP web services?
  25. Explain the difference between SOAP request and SOAP response.

Intermediate

  1. Explain the role of namespaces in SOAP.
  2. What are the different encoding styles in SOAP?
  3. What is document-style SOAP?
  4. What is RPC-style SOAP?
  5. Compare RPC and document-style SOAP.
  6. What is a SOAP Fault code?
  7. Explain the SOAP Fault string.
  8. What is the role of SOAP intermediaries?
  9. What are SOAP modules?
  10. What is the difference between SOAP encoding and literal?
  11. How does SOAP handle stateful operations?
  12. What is the difference between SOAP and JSON-RPC?
  13. Explain the difference between SOAP and XML-RPC.
  14. What is the SOAP processing model?
  15. Explain message-level security in SOAP.
  16. What are SOAP headers used for in authentication?
  17. How do you define operations in WSDL for SOAP?
  18. What is the difference between SOAP 1.1 and SOAP 1.2?
  19. What are SOAP faults in SOAP 1.2?
  20. What is the SOAP Message Transmission Optimization Mechanism (MTOM)?
  21. How does SOAP handle attachments?
  22. What is the difference between DIME and MTOM?
  23. How is error handling done in SOAP?
  24. How does SOAP handle multiple operations in a single service?
  25. What are the different WSDL binding styles for SOAP?

Advanced

  1. Explain the security challenges in SOAP.
  2. What is WS-Security in SOAP?
  3. What are WS-* standards?
  4. Explain WS-Addressing in SOAP.
  5. What is WS-ReliableMessaging?
  6. What is WS-Policy?
  7. Explain WS-AtomicTransaction.
  8. What is WS-Federation?
  9. How does WS-Security implement encryption in SOAP?
  10. How does WS-Security implement digital signatures?
  11. Explain UsernameToken in WS-Security.
  12. What is the difference between message-level and transport-level security in SOAP?
  13. What is the role of SAML tokens in SOAP web services?
  14. How do SOAP services handle large messages?
  15. What are best practices for SOAP fault handling?
  16. What are SOAP handlers?
  17. What is the difference between a handler and an interceptor in SOAP?
  18. How does SOAP ensure interoperability?
  19. Explain contract-first vs code-first SOAP service development.
  20. How do you generate SOAP client stubs from WSDL?
  21. What are the advantages of WSDL over manual SOAP XML creation?
  22. What is the difference between synchronous and asynchronous SOAP calls?
  23. How do you monitor SOAP web services?
  24. What is the impact of namespaces on SOAP interoperability?
  25. Explain SOAP over JMS (Java Messaging Service).

Expert

  1. How do you design scalable SOAP web services?
  2. How does SOAP integrate with Enterprise Service Bus (ESB)?
  3. How do you optimize SOAP performance?
  4. Explain SOAP message compression techniques.
  5. How do you debug SOAP messages?
  6. How do you log SOAP requests and responses securely?
  7. What are common SOAP security vulnerabilities?
  8. How do you mitigate XML External Entity (XXE) attacks in SOAP?
  9. How do you secure SOAP against replay attacks?
  10. How do you implement SSL/TLS with SOAP?
  11. How do you load test SOAP services?
  12. What are some SOAP testing tools?
  13. Explain how SOAP integrates with Spring Web Services.
  14. How do you expose SOAP web services in Java (JAX-WS)?
  15. How do you consume SOAP services in Java?
  16. How do you consume SOAP services in .NET?
  17. How does SOAP integrate with Apache CXF?
  18. Explain the role of Axis2 in SOAP web services.
  19. How do you migrate SOAP to REST?
  20. What are common real-world use cases for SOAP?
  21. How do you design fault-tolerant SOAP web services?
  22. How do you implement versioning in SOAP services?
  23. Explain SOAP in the context of microservices.
  24. What is the future of SOAP in modern architectures?
  25. Compare SOAP, REST, GraphQL, and gRPC in enterprise applications.

Related Topics


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29 June 2021

#OpenStack

#OpenStack

Key Concepts


S.No Topic Sub-Topics
1 OpenStack What is OpenStack, History, OpenStack components overview, Use cases, Cloud types
2 Cloud Computing Basics IaaS concepts, Virtualization basics, Hypervisors, Cloud architecture, OpenStack vs AWS
3 OpenStack Architecture Controller node, Compute node, Network node, Storage node, Message queue
4 OpenStack Installation Overview DevStack, PackStack, Kolla-Ansible, Manual install, Hardware requirements
5 Identity Service ? Keystone Users, Projects, Domains, Roles, Authentication
6 Compute Service ? Nova Nova architecture, Instances, Flavors, Scheduling, Live migration
7 Image Service ? Glance Image formats, Image upload, Image storage, Image caching, Image security
8 Networking Service ? Neutron Networks, Subnets, Routers, Security groups, Floating IPs
9 Neutron Advanced Networking Provider networks, Tenant networks, VLAN, VXLAN, SDN integration
10 Block Storage ? Cinder Volume types, Backends, Snapshots, Attach/detach, Performance tuning
11 Object Storage ? Swift Containers, Objects, Rings, Replication, Consistency
12 Dashboard ? Horizon UI overview, User dashboard, Admin dashboard, Customization, Security
13 Telemetry ? Ceilometer Metrics collection, Events, Alarms, Data storage, Use cases
14 Orchestration ? Heat Heat templates, Stacks, Resource types, Autoscaling, Rollbacks
15 Bare Metal ? Ironic Bare metal provisioning, PXE boot, Hardware inspection, Node lifecycle, Use cases
16 Database Service ? Trove DB instances, Backups, Replication, Scaling, Security
17 Load Balancer ? Octavia Load balancer concepts, Listeners, Pools, Health monitors, HA
18 Container Integration Magnum, Kubernetes integration, Docker, Container networking, Use cases
19 OpenStack Security RBAC, TLS, Secrets management, Network security, Compliance
20 High Availability HA architecture, Pacemaker, Corosync, Load balancing, Failure recovery
21 OpenStack Storage Architecture Block vs Object vs File storage, Backends, Performance, Scalability, Backup
22 Logging & Monitoring Centralized logging, Monitoring tools, Alerts, Metrics, Troubleshooting
23 OpenStack Networking Troubleshooting Neutron logs, Namespace debugging, Packet tracing, Common issues, Tools
24 Upgrade & Maintenance Rolling upgrades, Backup strategies, Data migration, Patch management, Downtime handling
25 Performance Optimization Compute tuning, Network tuning, Storage tuning, Scheduler tuning, Benchmarking
26 OpenStack APIs & CLI REST APIs, OpenStack client, Authentication, Automation, Scripting
27 DevOps with OpenStack CI/CD integration, Infrastructure as Code, Ansible, Terraform, GitOps
28 Multi-Region & Hybrid Cloud Regions, Availability zones, Hybrid integration, Federation, Use cases
29 Production Deployment Best Practices Capacity planning, Security hardening, Monitoring, SLA, Cost optimization
30 Advanced & Future Topics Edge computing, NFV, AI workloads, OpenStack + Kubernetes, Future roadmap

Interview question

Basic Level

  1. What is OpenStack?
  2. List the core components of OpenStack.
  3. What is Nova in OpenStack?
  4. What is the role of Neutron?
  5. What is Keystone in OpenStack?
  6. What is Horizon?
  7. What is Glance used for?
  8. What is Cinder used for?
  9. What is Swift used for?
  10. What are Flavors in OpenStack?
  11. Difference between Compute and Hypervisor.
  12. What are Security Groups?
  13. What is a Project/Tenant in OpenStack?
  14. What is a Domain in Keystone?
  15. What is an Image in OpenStack?
  16. What is an Instance in OpenStack?
  17. Difference between Instance and Flavor.
  18. What is a Network in Neutron?
  19. What is a Subnet in Neutron?
  20. What is a Router in OpenStack?
  21. Difference between Public and Private Networks.
  22. What is Floating IP?
  23. How to launch an instance from Horizon?
  24. How to launch an instance using CLI?
  25. What is a Volume in Cinder?
  26. What is a Snapshot?
  27. Difference between Snapshot and Backup.
  28. What is the default image format in Glance?
  29. What is a Key Pair in OpenStack?
  30. Difference between Key Pair and Password Authentication.
  31. What is Nova Scheduler?
  32. What is the difference between Bare Metal and VM instances?
  33. What is a Tenant Network?
  34. What is LBaaS in OpenStack?
  35. What is Heat used for?
  36. What is DevStack?
  37. What is Magnum?
  38. What is Zun?
  39. What is Manila?
  40. What is Trove?
  41. What is Sahara?
  42. What is Zaqar?
  43. What is Ironic?
  44. What is a Compute Node?
  45. What is a Controller Node?
  46. What is a Message Queue in OpenStack?
  47. What is RabbitMQ used for?
  48. What is an Endpoint in Keystone?
  49. How to check the OpenStack version?
  50. What is the OpenStack CLI?

Intermediate Level

  1. How to create a flavor using CLI?
  2. How to create a network using CLI?
  3. How to create a subnet in Neutron?
  4. How to attach a volume to an instance?
  5. How to create a snapshot of a volume?
  6. How to create a key pair using CLI?
  7. How to launch an instance using a custom image?
  8. How to create a router in Neutron?
  9. How to configure Floating IPs for instances?
  10. How to manage Security Groups using CLI?
  11. How to create a Project/Tenant?
  12. How to assign roles to a user in a project?
  13. How to upload an image to Glance?
  14. How to delete an image from Glance?
  15. How to scale instances using Nova?
  16. How to create an autoscaling Heat template?
  17. How to manage instance metadata?
  18. How to configure LBaaS for a network?
  19. How to configure VPNaaS?
  20. How to enable HA for Compute nodes?
  21. How to monitor instances using Ceilometer?
  22. How to collect telemetry data with Gnocchi?
  23. How to trigger alarms with Aodh?
  24. How to manage logs using Monasca?
  25. How to integrate Horizon with Keystone?
  26. How to customize Horizon panels?
  27. How to register a new hypervisor with Nova?
  28. How to manage projects and quotas?
  29. How to configure object storage container policies?
  30. How to configure versioning in Swift?
  31. How to use Glance image properties?
  32. How to migrate instances between hosts?
  33. How to attach a network interface to an instance?
  34. How to use Heat stack outputs?
  35. How to manage multiple tenants?
  36. How to configure QoS in Neutron?
  37. How to configure VLAN and VXLAN networks?
  38. How to set up OpenStack CLI environment variables?
  39. How to use OpenStack SDKs?
  40. How to integrate OpenStack with LDAP for authentication?
  41. How to enable Horizon multi-tenancy?
  42. How to manage Nova flavors programmatically?
  43. How to use Cinder volume types?
  44. How to implement encryption for Cinder volumes?
  45. How to implement Swift object versioning?
  46. How to deploy containerized workloads using Magnum?
  47. How to deploy Docker containers with Zun?
  48. How to manage shared file systems using Manila?
  49. How to monitor usage quotas per project?
  50. How to enable detailed logging for services?

Advanced Level

  1. How to configure multi-host Nova scheduler policies?
  2. How to implement HA for Keystone and Horizon?
  3. How to configure Neutron L3 agents for multiple routers?
  4. How to implement advanced Security Groups and Firewall rules?
  5. How to configure distributed LBaaS with Octavia?
  6. How to design multi-backend Cinder storage?
  7. How to implement Swift replication across regions?
  8. How to manage large-scale Glance image catalogs?
  9. How to implement Nova cell architecture?
  10. How to optimize VM placement with Nova scheduler filters?
  11. How to configure Ceilometer for multi-tenant metrics collection?
  12. How to implement custom alarms using Aodh?
  13. How to integrate Monasca with external monitoring systems?
  14. How to implement custom Heat templates for enterprise deployment?
  15. How to configure automatic stack scaling with Heat?
  16. How to integrate Keystone with external identity providers?
  17. How to implement advanced network segmentation using ML2 plugins?
  18. How to configure VXLAN and VLAN networks for multi-tenant isolation?
  19. How to configure DHCP, L3, and Metadata agents in Neutron?
  20. How to implement distributed firewall policies?
  21. How to secure Cinder and Swift with encryption and key management?
  22. How to implement multi-region Swift storage replication?
  23. How to configure object lifecycle policies in Swift?
  24. How to implement GPU scheduling in Nova?
  25. How to monitor instance performance metrics in large deployments?
  26. How to automate instance backups and recovery?
  27. How to integrate OpenStack with Ceph for storage backend?
  28. How to implement high availability for Gnocchi and Aodh?
  29. How to configure advanced logging with Monasca and ELK?
  30. How to deploy containerized clusters with Magnum at scale?
  31. How to implement advanced orchestration using Heat and Ansible?
  32. How to optimize resource allocation across multiple tenants?
  33. How to implement quota management policies for projects?
  34. How to implement advanced Horizon customizations for enterprise users?
  35. How to deploy and scale Ironic bare metal nodes?
  36. How to implement service discovery for OpenStack services?
  37. How to implement disaster recovery for Nova and Cinder?
  38. How to integrate OpenStack with external storage arrays?
  39. How to implement automated monitoring and alerting for all services?
  40. How to configure multi-availability zone deployments?
  41. How to implement advanced firewall rules with Neutron plugins?
  42. How to optimize Cinder volume performance for high IOPS workloads?
  43. How to implement shared file systems with Manila at scale?
  44. How to integrate Trove DBaaS with applications?
  45. How to deploy Hadoop/Spark clusters using Sahara?
  46. How to implement messaging services with Zaqar at scale?
  47. How to integrate OpenStack services with CI/CD pipelines?
  48. How to implement advanced auditing and compliance logging?
  49. How to troubleshoot multi-service dependency failures?
  50. How to implement enterprise-grade security policies across OpenStack?

Expert Level

  1. How to architect multi-region OpenStack deployments?
  2. How to implement zero-downtime upgrades for OpenStack services?
  3. How to design enterprise-grade HA for Nova, Cinder, and Neutron?
  4. How to implement multi-cell Nova architecture for thousands of VMs?
  5. How to implement advanced network overlays for hybrid cloud integration?
  6. How to design multi-tenant storage with replication and encryption?
  7. How to implement multi-backend Glance image services at scale?
  8. How to implement global object replication for Swift?
  9. How to integrate OpenStack with VMware and external cloud platforms?
  10. How to implement advanced telemetry aggregation for enterprise analytics?
  11. How to automate orchestration with Heat, Ansible, and Terraform?
  12. How to implement hybrid cloud container orchestration with Magnum?
  13. How to deploy and manage Kubernetes clusters via Zun and Magnum?
  14. How to implement enterprise-grade disaster recovery plans?
  15. How to implement automated scaling across compute and storage?
  16. How to enforce enterprise security compliance using Keystone and Barbican?
  17. How to manage multi-datacenter storage replication?
  18. How to optimize network performance for multi-tenant workloads?
  19. How to implement confidential computing with secure nodes?
  20. How to integrate OpenStack logging with enterprise SIEM systems?
  21. How to implement advanced monitoring and predictive analytics?
  22. How to deploy and manage HPC clusters in OpenStack?
  23. How to implement advanced quota and resource scheduling?
  24. How to integrate OpenStack with enterprise LDAP/Active Directory at scale?
  25. How to implement advanced identity federation strategies?
  26. How to design multi-service dependency monitoring?
  27. How to optimize storage backend for mixed workloads?
  28. How to implement large-scale Heat orchestration pipelines?
  29. How to secure bare metal nodes with Ironic at enterprise scale?
  30. How to implement multi-region and multi-cloud backup strategies?
  31. How to integrate OpenStack with public cloud services?
  32. How to implement service mesh patterns in OpenStack environments?
  33. How to troubleshoot cross-service failures at enterprise scale?
  34. How to implement fine-grained RBAC across thousands of users?
  35. How to implement advanced API rate limiting and throttling?
  36. How to integrate OpenStack with external monitoring and alerting tools?
  37. How to implement automated CI/CD for OpenStack service updates?
  38. How to manage large-scale shared file systems with Manila?
  39. How to optimize Neutron networks for high-performance workloads?
  40. How to implement advanced security compliance auditing?
  41. How to monitor performance of multi-region OpenStack clusters?
  42. How to integrate OpenStack with AI/ML workloads?
  43. How to implement predictive scaling for Nova and Magnum workloads?
  44. How to enforce enterprise-wide policy compliance across projects?
  45. How to implement hybrid cloud networking with multi-cloud VPCs?
  46. How to secure inter-service communication in multi-region OpenStack?
  47. How to implement zero-trust security models in OpenStack?
  48. How to design OpenStack for 99.999% availability?
  49. How to implement cross-cloud orchestration for hybrid deployments?
  50. How to optimize OpenStack for petabyte-scale storage and analytics?

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10 November 2020

#GraphQL

#GraphQL

Key Concepts


S.No Topic Sub-Topics
1 GraphQL What is GraphQL?, Features, Advantages, Use cases, REST vs GraphQL
2 GraphQL Architecture Server, Client, Schema, Resolver, Type System
3 Setting Up GraphQL Installation, Apollo Server, GraphQL Yoga, Express integration, Node.js setup
4 GraphQL Schema Type definitions, Scalars, Object types, Enums, Interfaces
5 Queries Basic queries, Nested queries, Arguments, Aliases, Fragments
6 Mutations Creating mutations, Arguments, Input types, Payloads, Return values
7 Resolvers Query resolvers, Mutation resolvers, Field resolvers, Parent and args, Context
8 GraphQL Types Scalar types, Object types, Enum types, Union types, Input types
9 Variables Query variables, Mutation variables, Default values, Validation, Security
10 Fragments Reusable fragments, Fragment syntax, Nested fragments, Inline fragments, Best practices
11 Directives @include, @skip, @deprecated, Custom directives, Use cases
12 GraphQL Playground & Tools GraphiQL, Apollo Studio, Insomnia, Postman, Playground setup
13 Error Handling Errors in resolvers, Formatting errors, Error codes, Logging, Best practices
14 Authentication & Authorization JWT tokens, OAuth integration, Role-based access, Context handling, Securing endpoints
15 Pagination Offset-based, Cursor-based, Relay style, Performance optimization, Best practices
16 Filtering & Sorting Query filters, Logical operators, Sorting by fields, Nested filters, Best practices
17 GraphQL Subscriptions Real-time updates, WebSockets, Setup with Apollo, Publish/Subscribe model, Use cases
18 Batching & Caching DataLoader, Query batching, Response caching, Client-side caching, Server-side caching
19 Performance Optimization Query complexity analysis, Caching, Persisted queries, Lazy loading, Resolver optimization
20 GraphQL with Databases SQL integration, NoSQL integration, ORM usage, Query mapping, Data fetching strategies
21 GraphQL Federation Microservices architecture, Apollo Federation, Schema stitching, Resolver delegation, Best practices
22 Schema Design Best Practices Modular schemas, Naming conventions, Versioning, Documentation, Extensibility
23 Testing GraphQL APIs Unit tests, Integration tests, Mocking resolvers, Jest, Apollo testing utilities
24 Security Best Practices Query depth limiting, Query cost analysis, Authentication, Authorization, Input validation
25 GraphQL Clients Apollo Client, Relay, URQL, React integration, Angular/ Vue integration
26 GraphQL Server Deployment Hosting options, Docker deployment, Kubernetes, Scaling, Monitoring
27 Versioning & Maintenance Schema evolution, Deprecating fields, Backward compatibility, Documentation, Change management
28 Advanced Features Union types, Interfaces, Custom scalars, Schema stitching, Middleware
29 Hands-on Projects CRUD API project, Real-time chat app, E-commerce API, Social media API, Analytics dashboard API
30 Certification & Career Path GraphQL certification, Job roles, Portfolio projects, Learning resources, Career opportunities

Interview question

Basic

  1. What is GraphQL?
  2. Who developed GraphQL?
  3. What are the main benefits of GraphQL over REST?
  4. What is a GraphQL schema?
  5. What are queries in GraphQL?
  6. What are mutations in GraphQL?
  7. What are subscriptions in GraphQL?
  8. What is a resolver in GraphQL?
  9. What is the difference between query and mutation?
  10. What are GraphQL types?
  11. What are scalar types in GraphQL?
  12. What are enums in GraphQL?
  13. What are lists in GraphQL?
  14. What are non-null types in GraphQL?
  15. What is introspection in GraphQL?
  16. What is a fragment in GraphQL?
  17. What are directives in GraphQL?
  18. What is the default HTTP method for GraphQL requests?
  19. How is GraphQL strongly typed?
  20. What is the difference between GraphQL and SQL?
  21. Can GraphQL work without a database?
  22. What is the role of __typename in GraphQL?
  23. What is batching in GraphQL?
  24. What is the purpose of GraphQL variables?
  25. What are the limitations of GraphQL?

Intermediate

  1. What is the role of GraphQL schema definition language (SDL)?
  2. How do you define custom scalar types in GraphQL?
  3. Explain input types in GraphQL.
  4. What are unions in GraphQL?
  5. What are interfaces in GraphQL?
  6. How do you validate GraphQL queries?
  7. How does GraphQL handle versioning?
  8. What are the best practices for naming in GraphQL schema?
  9. What is query complexity analysis?
  10. How does GraphQL handle over-fetching and under-fetching?
  11. What are nested resolvers?
  12. What is the N+1 problem in GraphQL?
  13. How can you solve the N+1 problem in GraphQL?
  14. What is DataLoader in GraphQL?
  15. How does GraphQL handle error reporting?
  16. What are partial responses in GraphQL?
  17. How does GraphQL differ from gRPC?
  18. How do you use variables with fragments in GraphQL?
  19. How does caching work in GraphQL?
  20. What is persisted queries in GraphQL?
  21. What is GraphQL Playground?
  22. What is Apollo Server?
  23. What is Relay in GraphQL?
  24. How do GraphQL subscriptions work with WebSockets?
  25. What are the security concerns in GraphQL?

Advanced

  1. What are GraphQL Federation and schema stitching?
  2. What is Apollo Federation?
  3. What is the difference between schema stitching and federation?
  4. What is GraphQL Gateway?
  5. How do you implement authentication in GraphQL?
  6. How do you implement authorization in GraphQL?
  7. What are GraphQL directives and how do you create custom ones?
  8. How do you handle file uploads in GraphQL?
  9. What is GraphQL mesh?
  10. What are GraphQL unions vs interfaces?
  11. How do you implement batching in GraphQL resolvers?
  12. What are best practices for designing GraphQL mutations?
  13. How do you handle pagination in GraphQL?
  14. What are Relay-style pagination and connections?
  15. How do you handle rate limiting in GraphQL APIs?
  16. What is query depth limiting in GraphQL?
  17. How does GraphQL handle subscriptions at scale?
  18. How does GraphQL integrate with microservices?
  19. How do you monitor GraphQL performance?
  20. How do you trace GraphQL queries in production?
  21. What is schema federation in Apollo?
  22. What are schema delegation techniques in GraphQL?
  23. How do you modularize large GraphQL schemas?
  24. What is GraphQL schema stitching middleware?
  25. What are GraphQL schema directives for logging and tracing?

Expert

  1. How do you secure GraphQL APIs against DoS attacks?
  2. What is query cost analysis in GraphQL?
  3. How do you handle caching in GraphQL at scale?
  4. How do you integrate GraphQL with REST APIs?
  5. How do you integrate GraphQL with gRPC?
  6. How do you optimize GraphQL queries in production?
  7. What are advanced DataLoader patterns?
  8. How do you implement GraphQL schema federation in microservices architecture?
  9. How do you version GraphQL schemas in large organizations?
  10. How does GraphQL fit into Event-Driven Architectures (EDA)?
  11. How do you monitor and log GraphQL errors?
  12. How do you integrate GraphQL with Kafka?
  13. How do you handle real-time updates in GraphQL at scale?
  14. What is Apollo Gateway architecture?
  15. How do you build resilient GraphQL APIs?
  16. What are GraphQL SDL limitations and solutions?
  17. How do you implement GraphQL authorization at field level?
  18. How do you manage breaking changes in GraphQL APIs?
  19. What are GraphQL best practices for microfrontends?
  20. How do you design GraphQL APIs for large-scale enterprise systems?
  21. What is GraphQL-over-HTTP vs GraphQL-over-WebSockets?
  22. How do you handle federation across multiple teams in GraphQL?
  23. What are common GraphQL anti-patterns?
  24. What is the future of GraphQL in API design?
  25. Compare GraphQL, REST, gRPC, and OData for enterprise use cases.

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04 November 2020

#Linux

#Linux

Key Concepts


Topic Sub-Topics Basic Intermediate Advanced Expert
Linux Basics Linux distributions, File system structure, Kernel vs User space, Commands overview ✅ ✅
File Management File types, Permissions, Ownership, Links, File operations ✅ ✅ ✅
Process Management ps, top, htop, jobs, kill, nice, renice, signals ✅ ✅ ✅ ✅
Users & Groups Adding/removing users, Groups, sudo, permissions, /etc/passwd, /etc/group ✅ ✅ ✅ ✅
Package Management apt, yum, rpm, dpkg, snap, package updates ✅ ✅ ✅ ✅
Shell Scripting Variables, Loops, Conditionals, Functions, Cron jobs ✅ ✅ ✅ ✅
Networking ifconfig/ip, netstat, ss, ping, traceroute, firewall, ports ✅ ✅ ✅ ✅
Disk & Storage df, du, mount/umount, LVM, RAID, quotas ✅ ✅ ✅ ✅
System Monitoring top, vmstat, iostat, sar, free, uptime, logs ✅ ✅ ✅ ✅
Logging & Troubleshooting syslog, journalctl, dmesg, logrotate, error analysis ✅ ✅ ✅ ✅
Security & Permissions SELinux, AppArmor, chmod, chown, sudoers, firewalld ✅ ✅ ✅ ✅
Networking Services SSH, FTP, HTTP, DNS, DHCP, NFS, Samba ✅ ✅ ✅ ✅
Kernel & Modules Kernel parameters, sysctl, modules, modprobe, kernel tuning ✅ ✅ ✅
Performance Tuning CPU, Memory, I/O tuning, ulimit, caching, tuning tools ✅ ✅ ✅
Advanced Topics Containers (Docker), Virtualization, Systemd, automation, DevOps integration ✅ ✅ ✅

Interview question

1. Linux Basics

  1. What is Linux and how is it different from Unix?
  2. What are the main Linux distributions?
  3. Explain the difference between Kernel and User Space.
  4. What is the Linux file system hierarchy?
  5. What are inodes in Linux?
  6. What are symbolic and hard links?
  7. What is a shell in Linux?
  8. What are the common Linux shells?
  9. What is the difference between GUI and CLI in Linux?
  10. How to check the current Linux version?
  11. What is the purpose of /etc directory?
  12. What are runlevels in Linux?
  13. How to switch between runlevels?
  14. What are init and systemd?
  15. What is the purpose of /proc directory?
  16. How to check uptime and load average?
  17. How to find the Linux kernel version?
  18. What is a daemon in Linux?
  19. How to check system architecture?
  20. How to use man pages effectively?

2. File Management

  1. What are different file types in Linux?
  2. How to change file permissions using chmod?
  3. How to change ownership using chown?
  4. How to create symbolic and hard links?
  5. How to list files with detailed information?
  6. What is the difference between relative and absolute paths?
  7. How to search for files using find and locate?
  8. How to check disk usage with du and df?
  9. How to monitor file system usage?
  10. How to compress and decompress files using tar, gzip, bzip2?
  11. How to check file content using cat, less, more?
  12. How to edit files using vi or nano?
  13. How to monitor changes in files using tail -f?
  14. How to compare files using diff and cmp?
  15. How to backup files using rsync?
  16. How to find large files on the system?
  17. How to change timestamps using touch?
  18. How to manage hidden files?
  19. How to set default permissions using umask?
  20. How to mount and unmount file systems?

3. Process Management

  1. How to list running processes using ps and top?
  2. How to kill a process using kill and killall?
  3. How to change process priority using nice and renice?
  4. What are foreground and background processes?
  5. How to manage jobs using jobs, fg, bg commands?
  6. How to monitor CPU and memory usage per process?
  7. How to handle zombie processes?
  8. How to handle orphan processes?
  9. How to use systemctl to manage services?
  10. How to automate process monitoring using scripts?
  11. What is a PID and how to find it?
  12. How to track process resource usage using pidstat?
  13. How to manage threads in Linux processes?
  14. How to use pgrep to find processes?
  15. How to use top and htop effectively?
  16. How to monitor real-time processes with watch command?
  17. How to manage system services with service command?
  18. How to limit process resources using ulimit?
  19. How to analyze CPU-bound processes?
  20. How to analyze memory-bound processes?

4. Users & Groups

  1. How to add and remove users?
  2. How to add and remove groups?
  3. How to modify user properties?
  4. How to assign users to groups?
  5. How to switch users using su and sudo?
  6. What is the difference between su and sudo?
  7. How to configure password policies?
  8. How to check user login history using last command?
  9. How to restrict user access?
  10. How to implement sudoers configuration?
  11. How to lock and unlock user accounts?
  12. How to delete users and remove home directories?
  13. How to check current logged-in users?
  14. How to list all users and groups?
  15. How to manage SSH access for users?
  16. How to configure user quotas?
  17. How to monitor user activity?
  18. How to set default shell for a user?
  19. How to create system users?
  20. How to manage user environment variables?

5. Package Management

  1. What are different package managers in Linux?
  2. How to install packages using apt?
  3. How to install packages using yum?
  4. How to remove packages using rpm?
  5. How to update all packages in a system?
  6. How to check installed packages?
  7. How to search for packages?
  8. How to manage repositories?
  9. How to resolve package dependencies?
  10. How to clean package cache?
  11. How to verify installed packages?
  12. How to downgrade a package?
  13. How to install packages from source?
  14. How to use dpkg to manage packages?
  15. How to use snap packages?
  16. How to check package versions?
  17. How to configure third-party repositories?
  18. How to manage kernel updates?
  19. How to handle broken packages?
  20. How to automate package updates?

6. Shell Scripting

  1. What are shell scripts?
  2. How to create and execute a shell script?
  3. How to define variables in shell scripts?
  4. How to use command-line arguments in scripts?
  5. How to use loops in shell scripting?
  6. How to use conditional statements?
  7. How to define functions in shell scripts?
  8. How to debug shell scripts?
  9. How to use exit codes?
  10. How to read user input in shell scripts?
  11. How to schedule scripts using cron jobs?
  12. How to redirect input and output?
  13. How to use pipes in shell scripting?
  14. How to handle errors in scripts?
  15. How to implement logging in scripts?
  16. How to use arrays in shell scripts?
  17. How to use case statements?
  18. How to use traps for signals?
  19. How to pass environment variables to scripts?
  20. How to implement reusable scripts?

7. Networking

  1. How to check network interfaces?
  2. How to check IP address using ifconfig/ip?
  3. How to check open ports using netstat/ss?
  4. How to test connectivity using ping?
  5. How to trace route using traceroute?
  6. How to monitor network traffic using tcpdump?
  7. How to configure firewall using iptables/firewalld?
  8. How to configure routing tables?
  9. How to check DNS resolution?
  10. How to troubleshoot network issues?
  11. How to use curl and wget for testing connections?
  12. How to check MAC address of network interface?
  13. How to configure static IP address?
  14. How to configure DHCP client?
  15. How to manage network services?
  16. How to monitor bandwidth usage?
  17. How to test port connectivity using telnet?
  18. How to analyze packet loss?
  19. How to implement NAT and port forwarding?
  20. How to configure VPN connections?

8. Disk & Storage

  1. How to check disk usage using df and du?
  2. How to mount and unmount file systems?
  3. How to create partitions using fdisk or parted?
  4. How to format partitions?
  5. How to create and manage LVM?
  6. How to extend or shrink logical volumes?
  7. How to configure RAID levels?
  8. How to check disk health using smartctl?
  9. How to monitor I/O performance using iostat?
  10. How to implement disk quotas?
  11. How to create swap space?
  12. How to enable or disable swap?
  13. How to configure automatic mounting?
  14. How to handle disk failures?
  15. How to backup and restore data?
  16. How to use rsync for file transfer?
  17. How to encrypt disk partitions?
  18. How to monitor disk latency?
  19. How to check inode usage?
  20. How to use tmpfs for temporary storage?

9. System Monitoring

  1. How to monitor CPU usage using top or htop?
  2. How to monitor memory usage using free and vmstat?
  3. How to monitor I/O using iostat and sar?
  4. How to check uptime and load average?
  5. How to monitor running processes?
  6. How to check swap usage?
  7. How to monitor logs for system issues?
  8. How to use dstat for real-time monitoring?
  9. How to monitor network traffic?
  10. How to use glances for system overview?
  11. How to monitor disk usage and inode usage?
  12. How to track process resource usage?
  13. How to monitor system boot time?
  14. How to monitor cron job execution?
  15. How to monitor system performance over time?
  16. How to use atop for performance analysis?
  17. How to monitor system limits using ulimit?
  18. How to monitor hardware temperature?
  19. How to monitor CPU frequency and scaling?
  20. How to monitor kernel logs?

10. Logging & Troubleshooting

  1. How to check system logs using /var/log?
  2. How to use journalctl for systemd logs?
  3. How to monitor real-time logs using tail -f?
  4. How to analyze dmesg output?
  5. How to rotate logs using logrotate?
  6. How to debug boot issues?
  7. How to troubleshoot service failures?
  8. How to find failed login attempts?
  9. How to analyze application logs?
  10. How to configure logging for custom applications?
  11. How to debug network issues?
  12. How to check file system errors?
  13. How to handle kernel panics?
  14. How to recover from crashed services?
  15. How to monitor disk space warnings?
  16. How to check SELinux audit logs?
  17. How to check firewall logs?
  18. How to debug package installation issues?
  19. How to monitor cron job errors?
  20. How to configure centralized logging?

11. Security & Permissions

  1. How to use chmod to change file permissions?
  2. How to use chown and chgrp for ownership?
  3. What is the difference between su and sudo?
  4. How to configure sudoers file?
  5. How to enable and configure SELinux?
  6. How to use AppArmor for security?
  7. How to configure firewall rules?
  8. How to implement file access control lists (ACLs)?
  9. How to monitor failed login attempts?
  10. How to secure SSH access?
  11. How to configure key-based authentication for SSH?
  12. How to disable root login over SSH?
  13. How to implement password policies?
  14. How to encrypt files and directories?
  15. How to monitor system for security breaches?
  16. How to manage user permissions and roles?
  17. How to apply security patches?
  18. How to configure auditd for auditing?
  19. How to implement network security monitoring?
  20. How to secure cron jobs and scheduled tasks?

12. Advanced Topics

  1. How to use containers (Docker) in Linux?
  2. How to use virtualization with KVM or VirtualBox?
  3. How to manage services using systemd?
  4. How to automate tasks using Ansible?
  5. How to configure kernel parameters with sysctl?
  6. How to tune CPU and memory for performance?
  7. How to implement monitoring with Prometheus and Grafana?
  8. How to configure advanced networking (VLANs, bridges)?
  9. How to use cgroups for resource control?
  10. How to debug performance issues using strace?
  11. How to use lsof to list open files?
  12. How to handle large log files efficiently?
  13. How to implement software RAID?
  14. How to set up NFS and Samba file sharing?
  15. How to use iptables and nftables for advanced firewalling?
  16. How to analyze kernel performance using perf?
  17. How to configure system for high availability?
  18. How to implement load balancing?
  19. How to use cron and at for scheduling?
  20. How to integrate Linux with cloud platforms (AWS, Azure, GCP)?

13. Troubleshooting & Best Practices

  1. How to troubleshoot boot issues?
  2. How to recover from a crashed service?
  3. How to debug memory leaks?
  4. How to identify CPU bottlenecks?
  5. How to handle disk full issues?
  6. How to analyze slow network performance?
  7. How to recover deleted files?
  8. How to implement system backup strategies?
  9. How to apply patch management effectively?
  10. What are the best practices for Linux system administration?

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