Upstash prodived Redis URL not reachable from buildpack?

[kitplummer]

Trying to connect an Elixir app to a provided Redis URL from upstash.io. But I get an :nxdomain error when I try to deploy (and connect to it). Any ideas, maybe missing config in the fly.toml?

[jsierles]

The Redis URL resolves to an internal IPv6 address, so your app and Redis client need to be configured to support that. Check our this thread for more info: nxdomain for Elixir app

[kitplummer]

Found it here:

[SOLVED] Elixir/Phoenix -> Redis Instance - Unknown Host

Hmm. Strange. First thing: [experimental] private_network=true … is no longer needed. That’s confirmed by Fly e.g Hence that makes no difference. So yep, you can remove that. Next, is the app in the same organization as the Redis app? They need to be in order to be able to resolve each other’s internal hostnames. Next, if you are using Fly’s Redis, based on their guide, I recall that needs a password … Are you providing one from your app? Else that would explain why it can’t connect if …

[jsierles]

Great! Was the problem that Redis was deployed in a different organization?

[kitplummer]

No, they were in the same org. But somehow having two regions allowed the second deploy to connect and the canary to pass and roll it.