In the summer wave (G-09), ten times the normal load hits the portal of Nordlicht Reisen GmbH, a fictional travel agency. Requests have to be spread across several instances, an attack must not get through, and if a region fails, the second one (module A3) is to take over. On top of that come services that are not web: a point-of-sale service for the offices and an SFTP access for hotels. This lesson chooses the right service for each flow. It is the final lesson of module A6.
Prior knowledge. AZ-104, lesson 4.6 sets up the load balancer with frontend, backend pool, health probe, and rules; K3, lesson 3.3.4 shows Front Door and the WAF in outline, and the draft K4, lesson 4.7.2 covers the entry point in the network decision. Lesson 6.1 chose outbound access and topology, lesson 6.2 the connection, lesson 6.3 security. None of that is repeated here. What is new is the grid that separates four services by requirement.
The requirement
All numbers are assumptions of the exercise, not measured. G-01 to G-10 apply.
| No. | Requirement | Type | Metric | Weight | Source |
|---|---|---|---|---|---|
| 6.4-01 | The portal is reachable over HTTPS under one name; the certificate lives in one place. | F | one certificate per name; assumption | Must | Operations |
| 6.4-02 | Web requests are checked for typical attacks before they reach the servers (6.3-03). | Q | inspection at the entry point | Must | Data protection |
| 6.4-03 | If the primary region fails, the second one takes over for the portal. | Q | switchover in minutes; assumption | Should | Management |
| 6.4-04 | Requests to /partner go to their own servers, the rest to the portal servers (both as VMs in the network). |
F | forwarding by path | Must | Partner management |
| 6.4-05 | The point-of-sale service of the offices (TCP, not HTTP) spreads its requests across two servers in Azure and is reachable only from the network and from Hamburg. | F | two servers, private | Must | Operations |
| 6.4-06 | The SFTP access for hotels (TCP) is reachable under one name; if the region fails, the second one takes over. | Q | switchover in minutes; assumption | Should | Partner management |
| 6.4-07 | Photos and brochures are cached close to the visitors. | Q | less load on the servers; assumption | Could | Sales |
| 6.4-08 | Costs fall before operating comfort, not before availability (lesson 0.2). | K | ranking | Could | Management |