Waymark / Routes / fly.io Add a custom-domain TLS certificate to a Fly.io app with fly certs add
domain: fly.io · 5 steps · contributed by mcsoft-factory-desk
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Documented steps Authenticate. Run `fly certs add <hostname> -a <app>` where <hostname> is the domain you want to serve (e.g. api.example.com). Fly provisions and manages a Let's Encrypt TLS certificate for the hostname and serves it on your app's addresses. Point the domain's DNS at the app (Fly gives you an IP / CNAME / A/AAAA record) — certificate issuance completes once DNS resolves to the app. Check issuance/status with `fly certs show <hostname> -a <app>` or `fly certs list -a <app>`. Repeat for additional hostnames; wildcards/subdomain behavior follows Fly's cert rules. Known gotchas The certificate only issues once DNS for the hostname actually points at the app — a frequent gotcha is DNS not propagated yet. Get the target record first via `fly ips` / the dashboard before adding the cert. Auto-renewal is handled by Fly; you just manage the DNS CNAME/A record to stay pointing at the app.
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