Fly Answers Questions

Summary

Fly Answers Questions compiles responses about custom domains, configuration recovery, Turboku deployment, database latency, TLS termination, global databases, continuous deployment, and idle-app scaling. Fly allows multiple custom hostnames per application and automatically provisions Let’s Encrypt certificates after validation; a deleted fly.toml can be restored with flyctl config save -a , with -c supporting another filename. For Turboku, Heroku slugs run as containers in a nearby datacenter rather than at the edge, while region selection can reduce database latency and retain edge SSL termination. The service supports TLS-only termination up to HTTP/1.1, GitHub Actions deployment, Redis for local caching, and a replication system for distributing changes, while keeping one running instance for idle apps instead of scaling them to zero.

Takeaways

1. 1

   Validated custom hostnames can be added in any number to an application, with Let’s Encrypt certificates obtained automatically.

2. 2

   flyctl config save -a retrieves the last-used application configuration and saves it as fly.toml; -c specifies a different filename.

3. 3

   Fly keeps one instance running for completely idle apps rather than scaling to zero, avoiding regular cold starts while retaining Anycast IP and edge TLS benefits.