Is it possible to create a new connection pool if the servers are offline

[bbigras]

My application create a pool at startup to connect to one API and right now this API is down so my application can't start. I don't really need the API to be up when I start my application, only when I get a request for it.

Is there a way to do that?

[sfackler]

Yep, just set initialization_fail_fast to false.

[bbigras]

initialization_fail_fast(false) works and if I use min_idle(Some(0)) my application will only try to connect if needed. Nice.

If r2d2 is not able to connect, pool.get() will return an error but will still try to connect. It seems to ignore the min_idle set to 0. Is it normal behavior?

[sfackler]

I'm not sure it's explicitly intentional, more that it falls out from the implementation and generally feels like a reasonable thing to do - if you're trying to get a connection now, you'll probably be trying to get a connection again in the future.