If you haven’t deployed your app yet then you can do so with fly launch
I believe. Starter guides are here: Language & Framework Guides · Fly Docs
Otherwise, if you can’t do fly ssh console
because your app instance is failing, there’s not much I can really suggest other than checking logs + related posts.
Also for the 4th step, do I understand it right that Fly will handle the “replacing”? Can we also use the
internal.postgres_app_name
address all along or are there some limits?
Fly won’t handle the replacing, you’ll need to manually copy the DATABASE_URL
and manually replace the IPv6 address with YOUR_POSTGRES_APP_NAME.internal