Cloud Computing Foundations: AWS Regions & Availability Zones
පිටුව 10: Cloud Computing මූලිකාංග: AWS Regions සහ Availability Zones
Cloud එක කියන්නේ මොකක්ද? Amazon Global Infrastructure, Regions සහ Availability Zones (AZs) හරහා High Availability (HA) සහ Disaster Recovery සකසන හැටි.
Lab 10 of 20 · AWS Global Cloud · 5 hands-on activities · bilingual (English + සිංහල)
පිටුව 10: Cloud Computing මූලිකාංග: AWS Regions සහ Availability Zones
Cloud එක කියන්නේ මොකක්ද? Amazon Global Infrastructure, Regions සහ Availability Zones (AZs) හරහා High Availability (HA) සහ Disaster Recovery සකසන හැටි.
💡 සරල සිංහලෙන්: Cloud Computing, Regions සහ Availability Zones ඇයි?
Cloud එක කියන්නේ අහසේ තියෙන දෙයක් නෙවෙයි!
Amazon, Google වගේ ආයතන ලෝකය වටේම හදලා තියෙන දැවැන්ත පරිගණක මධ්‍යස්ථාන (Datacenters) වලින් අපිට අවශ්‍ය පරිගණක පැයකට සුළු මුදලකට කුලියට ගන්න එකයි Cloud Computing කියන්නේ.
Regions සහ Availability Zones (AZ) ඇයි?
එක Datacenter එකකට ගංවතුරක්, සුළි කුණාටුවක් හරි කරන්ට් කැපීමක් හරි වුණොත් වෙබ් සයිට් එක ඩවුන් වෙන්න පුළුවන්. ඒ නිසා Amazon එක එක රටක එකිනෙකට වෙනස් තැන් වල Datacenters 3ක් හරි 4ක් හරි හදනවා (Availability Zones). එකක් වැටුණත් අනිත් එකෙන් සයිට් එක බේරගන්නවා!
Architectural Foundation & Systems Diagram
Cloud computing is the on-demand delivery of IT resources over the Internet with pay-as-you-go pricing. AWS organizes its global infrastructure into hierarchical resilience zones:
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🌍 AWS Regions — A physical geographic location in the world containing multiple isolated datacenters (e.g.
us-east-1N. Virginia,ap-south-1Mumbai,eu-west-1Ireland). -
🏢 Availability Zones (AZs) — One or more discrete datacenters with redundant power, networking, and connectivity. Spaced miles apart to protect against single natural disasters!
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🛡️ Fault Tolerance & Multi-AZ — Never deploy all production workloads in a single AZ! Deploying across 2 or more AZs behind a Load Balancer ensures that if an entire datacenter floods, your site stays 100% online.
Step-by-step practical lab
Step 01: Query AWS Instance Metadata Service (IMDS)
සිංහලෙන් — AWS Cloud Server එකේ Public IP සහ Region විස්තර කියවීම.
Query the AWS EC2 instance metadata service (IMDS) to discover instance ID, availability zone, and private IP.
curl -s http://169.254.169.254/latest/meta-data/instance-id169.254.169.254: AWS link-local IP එක මඟින් Cloud Instance metadata ලබා දෙයි.
Expected output
i-0a1b2c3d4e5f67890SRE Tip: Automated provisioning scripts query IMDS at boot to determine which AWS Region and Availability Zone they are running in.
Hands-on practice activities
Work through these yourself — tick them off as you go.
- Activity 46: Understand Multi-AZ Architecture (Checkpoint) — Never deploy all production instances in a single AZ. Always spread across at least 2 Availability Zones behind an Application Load Balancer (ALB).
- Activity 47: Terminate Instances After Practice (Checkpoint) — Remember the instructor's critical warning: EC2 instances charge by the hour! Always STOP or TERMINATE your practice instances when you finish your lab.
- Activity 48: Region Selection Criteria (Checkpoint) — Evaluate data sovereignty laws (e.g. GDPR) and latency when choosing an AWS Region for customer data.
- Activity 49: Disaster Recovery (DR) RTO & RPO (Checkpoint) — Recovery Time Objective (RTO) = how fast you recover; Recovery Point Objective (RPO) = how much data loss is tolerable.
- Activity 50: AWS AZ Isolation Quiz (Quiz) — Why does a single AWS Region contain multiple Availability Zones? Answer: For high availability, fault tolerance, and disaster resilience.
Keep going: ← Lab 09 · Lab 11 → · Track your progress in the Self Guide
ExerciseKnowledge check
What AWS architectural concept represents physically isolated datacenters within a Region? / AWS Region එකක් තුළ ඇති isolated datacenters හඳුන්වන්නේ කුමක් ලෙසද?
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Part of Self Guide · Stage 11: SRE Labs II — cloud, containers and delivery. Progress is saved in this browser.
