Auto replace machine when deployment (outbound IP changes)

[StevenNguyen]

Hi all, I would greatly appreciate your assistance in clarifying the following points:

1, Is machine replacement during deployment considered normal behavior in this case?
2, Under what conditions can a machine’s IP address change automatically?
3, What is the recommended approach to ensure a stable outbound IP address for production systems that require IP whitelisting?

This issue is currently impacting live payment operations, and we would greatly appreciate your support.

[mayailurus]

@StevenNguyen

Under what conditions can a machine’s IP address change automatically?

Hi… For egress, they basically can change at any time:

By default, outbound (egress) IPs from Fly Machines are unstable and may change.

The only way to avoid that is with the special static egress IPs described in the above official doc.

@StevenNguyen

Is machine replacement during deployment considered normal behavior in this case?

This is normal if you’ve opted in to the blue-green deployment mode, but otherwise the Machines themselves should have a stable identity (even though their apparent IPs for outgoing requests may wobble, as above).

Hope this helps!