AWS Migration and Modernization Strategies

AWS Cloud & DevOps Engineering · Lesson 57 · Advanced Platforms and Networking

Lesson Overview

TechLearningPro did not begin as a pure AWS-native platform. Acquisitions bring on-prem LMSs, colo databases, brittle file shares of lecture videos, and “temporary” VPN tunnels that become permanent. Migration and modernization is how those estates move—safely—onto the landing zones, networking, data platforms, and operational practices you built in lessons 48–56. This lesson covers discovery, dependency mapping, the 7 Rs (rehost, relocate, replatform, refactor/re-architect, repurchase, retain, retire), tooling concepts for AWS Application Migration Service (MGN) and AWS Database Migration Service (DMS), wave planning, cutover risk, dual-running cost, and modernization sequencing so “lift-and-shift everything” is not the default religion.

Migration without landing-zone readiness creates shadow accounts and public databases. Modernization without product outcomes creates expensive Kubernetes museums. Tag Project=tlp-lesson57. Budgets must cover dual-running (source + AWS) and data transfer; clean up abandoned pilot replications. Verify current MGN/DMS feature docs—do not invent connector flags.

Learning Objectives

1. Explain discovery and inventory as prerequisites to strategy.
2. Build dependency maps for apps, data, identity, and network.
3. Apply the 7 Rs with TechLearningPro examples for each R.
4. Contrast rehost vs replatform vs refactor trade-offs.
5. Describe Application Migration Service (MGN) concepts for lift-and-shift.
6. Describe DMS concepts for database migration and CDC-style ongoing replication.
7. Plan migration waves by business risk and coupling.
8. Design cutover runbooks with rollback criteria.
9. Quantify dual-running FinOps impact (illustrative only).
10. Sequence networking (DX/VPN/TGW) before chatty cutovers.
11. Align migrations to Organizations/Control Tower readiness (lesson 48).
12. Identify when to retain or retire instead of migrating.
13. Address identity cutover (IAM Identity Center, directories).
14. Test performance and security baselines before DNS flip.
15. Document ADRs per wave decision.
16. Avoid big-bang cutovers for tightly coupled monoliths without rehearsal.
17. Integrate backup/DR so mid-migration disasters are recoverable.
18. Prepare interview answers on 7 Rs and cutover risk.
19. Map to Well-Architected migration lenses / readiness thinking.
20. Clean up pilot agents, replication instances, and test environments.

Prerequisites

• Multi-account and networking lessons 48–52; databases lesson 53; data lessons 54–56.
• FinOps budgets; change-management willingness.
• No production cutovers in class—tabletops and sandbox pilots only.

Detailed Core Concepts

Discovery

You cannot migrate what you cannot name. Inventory compute, OS, databases, file shares, certificates, scheduled jobs, firewall rules, and business owners. Tools such as AWS Application Discovery Service / Migration Hub concepts (verify current portfolio) help, but CMDB honesty and interviews matter more than scanners alone. TechLearningPro acquisition brand “Northline Learn” needs a named owner per system.

Dependency mapping

An exam service that still calls an on-prem license server will fail after rehost if the license path dies. Map sync/async dependencies, data flows, authentication, and batch windows. Draw Mermaid before waves.

The 7 Rs

Choosing R is a business decision informed by risk, value, and skills—not a logo preference.

Application Migration Service (MGN)

MGN continuously replicates source servers to AWS staging areas, then cut over with tested launch settings (instance type, subnet, SG). Ideal for rehost waves. Agents, replication bandwidth, and test launches matter. Continuity with hybrid connectivity lesson 51 for bandwidth planning.

Database Migration Service (DMS)

DMS migrates and can continuously replicate databases (CDC concepts) to AWS targets (RDS/Aurora/Redshift/S3, etc., per support matrices). Tasks, endpoints, replication instances, and schema conversion tooling (AWS SCT concepts) appear in real programs. Validate LOBs, unsupported types, and cutover freeze windows. Do not treat DMS as “click and forget schema redesign.”

Waves and governance

Wave 1: low-risk internal tools. Wave 2: content store with CRR. Wave 3: learner-facing exam with rehearsal. Each wave has entry/exit criteria, security review, and FinOps estimate. Migration Hub / portfolio tracking concepts keep executives honest.

Cutover risk

DNS TTL, session stickiness, data lag, certificate swaps, and rollback clocks. Define “go / no-go” metrics: replication lag under threshold, smoke tests green, on-call staffing present, budget for dual-run remaining. Rollback may mean DNS back + data reconciliation plan—not optimism.

Modernization sequencing

Prefer stabilizing on AWS (rehost) only when deadline-driven; otherwise replatform/refactor where unit economics or operability demand it. Landing zones, observability, and IAM must exist first—migrations onto snowflake accounts recreate on-prem chaos in the cloud.

Architecture and Design Diagrams

mermaidCopy
flowchart TB
  Disc[Discovery / inventory]
  Dep[Dependency maps]
  Rs[7 Rs decisions]
  Waves[Wave plan]
  Land[Landing zone ready]
  Pilot[Pilot replicate / test launch]
  Dual[Dual run + validate]
  Cut[Cutover / DNS]
  Decom[Decommission source]
  Mod[Modernize backlog]

  Disc --> Dep --> Rs --> Waves
  Land --> Pilot --> Dual --> Cut --> Decom --> Mod
  Waves --> Pilot

mermaidCopy
flowchart LR
  SrcDB[Source DB]
  DMS[DMS task]
  Aurora[Aurora target]
  SrcVM[Source VM]
  MGN[MGN replication]
  EC2[EC2 / launch template]
  SrcDB --> DMS --> Aurora
  SrcVM --> MGN --> EC2

Technical Explanation

Why discovery fails in practice

Shadow IT, undocumented cron, and “the Excel bot” that Finance runs monthly. Interview Finance and Support, not only Engineering. TechLearningPro’s certificate PDF generator might live on a forgotten Windows box—Object Lock targets in lesson 54 depend on knowing that box exists.

Rehost success criteria

Test launch boots, agents healthy, app smoke tests pass, CloudWatch logs flowing, IAM roles replace instance credentials where possible, backup plan exists, SG not copied as 0.0.0.0/0 blindly. Rehost is not “done” at first ping.

DMS lag and cutover

CDC lag must be near-zero before freeze. Application write stop → final sync → cut connections → validate checksums/row counts → open app on AWS. If lag never drains, investigate LOB mode, network, or task sizing—using current DMS troubleshooting docs.

Dual-running cost

Illustrative pattern: three months of EC2+RDS plus on-prem burn can exceed the “savings” narrative if decommission stalls. FinOps tracks dual-run as a first-class project cost; executives approve end dates.

Network cutover

Chatty apps need DX/VPN capacity (lesson 51) and possibly TGW (lesson 52). DNS via Route 53 with low TTL before event; raise TTL after stability. Hybrid identity must authenticate learners during the window.

Security during migration

Replication traffic encrypted; staging accounts isolated; do not widen security groups “temporarily forever”; Secrets Manager for new DB creds; CloudTrail on; GuardDuty on landing accounts before waves land.

Modernization backlog

Every rehost creates a ticket: move to Aurora, containers, S3 for videos, retire NFS. Lesson 58 ADRs and Well-Architected reviews prioritize that backlog.

Practical Implementation or Design Walkthrough

Problem

Create a phased migration plan for a legacy TechLearningPro-acquired LMS: web VM, MySQL, video NAS, and nightly batch.

Steps

1. Budget for pilot replication + dual-run estimate; tag Project=tlp-lesson57.
2. Inventory + dependency Mermaid.
3. Assign 7 Rs: e.g., videos→S3 (replatform storage), MySQL→Aurora via DMS (replatform), web→MGN rehost then ECS backlog (rehost now / refactor later), batch→retire if redundant.
4. Confirm landing zone OU/account and network path.
5. Design MGN pilot for non-prod twin; design DMS task to staging Aurora.
6. Wave plan with dates, owners, go/no-go.
7. Cutover tabletop with rollback.
8. ADR pack per major R decision.
9. Cleanup pilot agents/replication instances.
10. Evidence: plan doc + diagrams.

Enterprise Real-World Scenarios

Big-bang Friday night

All systems move; license server missed; Monday outage. Fix: dependency map + wave; license path tested.

DMS without schema review

Unsupported types fail mid-cutover. Fix: SCT assessment + pilot full load earlier.

Forever dual-run

On-prem never decommissioned; Finance furious. Fix: decommission gate in wave exit criteria.

Lift-and-shift public SG

Copied firewall rules open RDP to world. Fix: security rebuild as part of launch templates; Config rules.

Refactor during mandatory exit

Data center contract ends in 60 days; team rewrites to microservices. Fix: rehost first, refactor after—survive then improve.

Best Practices

1. Discover and map before choosing Rs.
2. Landing zone before waves.
3. Prefer waves over big-bang.
4. Pilot MGN/DMS on non-prod twins.
5. Rehearse cutover and rollback.
6. Track dual-run cost weekly.
7. Encrypt replication paths.
8. Rebuild SG/IAM—do not clone badness.
9. Set decommission deadlines.
10. Separate urgent rehost from strategic refactor.
11. Include identity and DNS in runbooks.
12. Measure lag and smoke tests as go/no-go.
13. Write ADRs per wave.
14. Keep DR viable mid-migration.
15. Verify tooling docs the week of cutover.

Common Mistakes and Anti-Patterns

1. 7 Rs as posters without decisions.
2. Migrating into unmanaged accounts.
3. Ignoring data gravity and transfer time.
4. No rollback clock.
5. Copying allow any firewall rules.
6. DMS as schema redesign tool.
7. Forever pilots never cut over.
8. Inventing MGN API flags in runbooks.
9. Forgetting batch jobs and DNS TTLs.
10. Celebrating rehost while retiring nothing.

Troubleshooting and Design Review

Interview Questions and Answers

Q1: 7 Rs? A: Rehost, relocate, replatform, refactor, repurchase, retain, retire.
Q2: Rehost vs refactor? A: Speed vs long-term design—sequence by deadline and value.
Q3: MGN? A: Block-level replication and cutover for server rehost.
Q4: DMS? A: Managed DB migration/replication service with CDC options.
Q5: Why discovery? A: Unknown deps cause cutover failure.
Q6: Wave planning? A: Risk-ordered batches with exit criteria.
Q7: Cutover risk? A: Lag, DNS, auth, rollback, staffing.
Q8: Dual-run? A: Paying source + target until decommission.
Q9: When retain? A: Low value / high risk / contract constraints.
Q10: When retire? A: No users/value—best ROI.
Q11: Landing zone first? A: Guardrails before workload sprawl.
Q12: SCT? A: Schema conversion assessment concepts for heterogeneous moves.
Q13: Success metric? A: Business outcomes + decommission, not merely “servers in AWS.”
Q14: Security trap? A: Cloning open firewall rules into SG.
Q15: FinOps trap? A: Endless dual-run without end date.

Hands-On Exercises

Exercise: Phased migration plan

Deliverable: inventory table, dependency diagram, 7 Rs assignments, wave plan, cutover/rollback tabletop notes, dual-run FinOps sketch (illustrative), ADRs, cleanup of any pilots.

Challenge ADR

Choose rehost-now/refactor-later for exam service under a 90-day colo exit; justify against full rewrite risk.

Lab evidence checklist

Budget; diagrams; wave plan; tabletop attendance; pilot cleanup.

Narrative: forgotten license server

Cutover succeeds technically; exams fail license check. War room maps dependency; temporary VPN path; permanent cloud license redesign queued.

Continuity

Prior analytics platform lessons feed data migration choices (DMS to Redshift/S3). Next: Well-Architected Reviews and Architecture Decision Records to institutionalize decisions from each wave.

Deep dive: Migration Hub / portfolio

Track applications, waves, and progress in a single portfolio view—verify current Migration Hub features.

Deep dive: VMware and relocate paths

If VMware estates exist, evaluate relocate offerings via current AWS docs—do not invent product names.

Deep dive: Data transfer mechanisms

Snow Family, DX, VPN, S3 Transfer Acceleration—choose by volume/timeline; verify pricing and suitability.

Extended enterprise scenario: regulated exam content

Data residency constraints limit Region choice; landing zone in approved Regions only; legal sign-off gate.

Extended enterprise scenario: partner SSO

Cutover breaks university SSO. Identity rehearsal mandatory; rollback DNS if IdP metadata wrong.

Extended practice scenario 1 — 57 aws migration and modernization strategies

Confirm AWS Budgets alerts exist for the sandbox; tag every resource Project=tlp-lesson57. Do not proceed without a budget subscriber.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 2 — 57 aws migration and modernization strategies

Document the lesson's primary architecture decision in a ten-line ADR: context, decision, status, consequences.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 3 — 57 aws migration and modernization strategies

Map identity paths: who can create/modify the resources in this lesson; which IAM roles are least privilege.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 4 — 57 aws migration and modernization strategies

Design observability: CloudWatch metrics/alarms or equivalent signals that prove the control works.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 5 — 57 aws migration and modernization strategies

Run or design a negative test: denied access, misconfiguration, or failed dependency—capture evidence.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 6 — 57 aws migration and modernization strategies

Estimate cost dimensions for this lesson's activities (migration tooling, dual-running environments, data transfer). Label figures illustrative; verify pricing pages with dates.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 7 — 57 aws migration and modernization strategies

Produce a cleanup checklist and execute destroy for any billable lab resources created for lesson 57.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 8 — 57 aws migration and modernization strategies

Cross-link prior course lessons that this design depends on; list two failure modes inherited from those layers.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 9 — 57 aws migration and modernization strategies

Security review: encryption at rest/in transit, public exposure checks, CloudTrail visibility for management events.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 10 — 57 aws migration and modernization strategies

Reliability review: cutover rollback, dual-run risk, how detection and recovery work.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 11 — 57 aws migration and modernization strategies

Performance review: bandwidth, replication lag, or cutover windows relevant to AWS migration and modernization (7 Rs, MGN/DMS, cutover).

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 12 — 57 aws migration and modernization strategies

Write a runbook section for on-call during migration cutover: symptoms, first three diagnostic steps, escalation, rollback.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 13 — 57 aws migration and modernization strategies

Config/compliance angle: which controls must be true before production cutover.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 14 — 57 aws migration and modernization strategies

Multi-account consideration: landing zone readiness from lessons 48–49 before migrating workloads.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 15 — 57 aws migration and modernization strategies

Interview drill: explain AWS migration and modernization (7 Rs, MGN/DMS, cutover) to a hiring manager in three minutes without inventing APIs.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 16 — 57 aws migration and modernization strategies

Pair review: partner stops any invented CLI flags, hardcoded secrets, or fake current prices.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 17 — 57 aws migration and modernization strategies

FinOps continuity from lesson 47: dual-running cost and when to decommission source.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 18 — 57 aws migration and modernization strategies

DR continuity from lesson 45: migration must not destroy recoverability mid-cutover.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 19 — 57 aws migration and modernization strategies

Produce evidence pack: diagrams, wave plans, test results, cleanup proof.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 20 — 57 aws migration and modernization strategies

Challenge constraint: tighter monthly budget—what do you sequence differently?

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 21 — 57 aws migration and modernization strategies

Challenge constraint: stricter compliance—what evidence gates cutover?

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 22 — 57 aws migration and modernization strategies

Challenge constraint: shorter maintenance window—what pre-staging changes?

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 23 — 57 aws migration and modernization strategies

Teach-back: recite the Lesson Overview paragraph, then check against the text; flashcard gaps.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 24 — 57 aws migration and modernization strategies

Dress rehearsal: cutover tabletop under a timer with observer notes.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Extended practice scenario 25 — 57 aws migration and modernization strategies

Final synthesis note: one paragraph connecting AWS migration and modernization (7 Rs, MGN/DMS, cutover) to TechLearningPro production ownership.

In a timed drill for AWS migration and modernization (7 Rs, MGN/DMS, cutover), implement or design the core lab with a partner observing. The observer's job is to stop any step that invents API flags, hardcodes secrets, invents pricing numbers presented as current quotes, or skips budget and cleanup. After the drill, rewrite your ADR in ten lines: context, decision, consequences. Attach evidence: wave plan, 7 Rs table, dependency Mermaid, cutover checklist, dual-run cost sketch, and destroy confirmation for any lab resources.

Discuss how migration depends on landing zones (48), networking (50–52), databases (53), data platform (54–56), FinOps (47), and DR (45). List two cutover failure modes you tabletopped, including detection and rollback.

Finally, teach back the lesson overview paragraph from memory, then check against the text. Gaps become flashcards. Premium courses finish when you can operate under time pressure without treating 7 Rs and cutover risk as a mystery.

Compliance evidence pack for auditors / platform leads

Budget configs, tagging proof (Project=tlp-lesson57), architecture diagram, ADR, negative-test evidence, encryption settings notes, CloudTrail/Config references where applicable, pricing-page retrieval dates for any dollar claims, cleanup confirmation.

Glossary drill

Review every bold term introduced in Detailed Core Concepts and Interview Q&A. Write one sentence definitions from memory; correct against the lesson. Unfamiliar AWS console navigation becomes a lab note, not a guess.

Budget and cleanup sworn statement

I verified budgets remain enabled with alert subscribers. I deleted or scheduled deletion for orphan lab resources from lesson 57 named ____. I labeled every savings or cost figure with pricing-page retrieval dates or marked it illustrative. Signed ________ date ________.

Interview story to memorize

Craft a 60-second story: TechLearningPro needed AWS migration and modernization (7 Rs, MGN/DMS, cutover); you chose a design with explicit trade-offs; you proved it with tests; you governed cost with budgets and tags; you left an ADR so the next engineer does not reverse the decision blindly.

Self-assessment rubric

Final synthesis before summary

Mastery of AWS migration and modernization (7 Rs, MGN/DMS, cutover) is not logo recognition—it is owning failure modes, cost meters, identity boundaries, and the written decision that keeps TechLearningPro coherent under change.

Lesson Summary

Migration success for TechLearningPro is discovery, dependency honesty, deliberate 7 Rs choices, MGN/DMS pilots, wave-based cutovers with rollback clocks, dual-run FinOps, and decommission—not merely “VMs in EC2.” Modernize on purpose after you can operate. Tag Project=tlp-lesson57; budget dual-run; clean up pilots.

Next: Well-Architected Reviews and Architecture Decision Records—how those choices get recorded and reviewed.

Further Reading

• AWS Migration Hub
• Application Migration Service (MGN)
• AWS Database Migration Service
• AWS Prescriptive Guidance — Migration
• 7 Rs overview (AWS migration strategy materials)
• Schema Conversion Tool
• AWS pricing — verify migration-related services
• Landing zone continuity — Organizations lesson
• Hybrid connectivity
• FinOps lesson