Having dedicated ip v4 address without opting it for it

[lubien]

Jerome shared a guide on how to have zero downtime migrating from dedicated to shared IPv4 in case you have certificates:

We are going to start charging for dedicated IPv4 in January 1st

An update: We now allow having both a shared IPv4 and dedicated IPv4. This change should make it possible to switch to a shared IPv4 without downtime. The produce looks like this: Add shared ipv4 via flyctl ips allocate-v4 --shared (Optional: add the shared ipv4 as an A record for your hostname if you don’t use a CNAME to .fly.dev) Confirm your app works via shared IP: curl -Iv http://<your-hostname> --resolve <your-hostname>:80:<shared ipv4 you got> (should respond with a 301 redirect) Wait …