Quick Notes123 words
Minimising downtime — quick notes
Minimising downtime — quick notes
| Mechanism | Level |
|---|---|
| Load balancing | Network — drain before update |
| Rolling deployment | Fleet — batches via maxParallel |
| Deployment slots + swap | App Service — warm then swap |
| Fact | Detail |
|---|---|
| Swap benefit | Instance is already warm; no cold start for users |
| Rollback | Swap back — reversible |
| Slot settings | Sticky to the slot; do not move during a swap |
Lower maxParallel | Less capacity lost, longer deployment |
Trap: a connection string that is not a slot setting follows the app across a swap — production ends up pointing at the staging database.