Successfully deployed the redis app, set my password, then set the REDIS_URL secret in my main application, receiving: Error: could not find an instance to route to
It looks like I accidentally overwrote some configurations in fly.toml when I launched.
Also looks like I need to expose internal_port = 6379 under [[services]].
update
Still experiencing the internal connection issue mentioned above.
update 2
Forgot to switch the process value in my app toml from process=["app"] to process=["web"]
update 3
It worked! 
Thanks @sosedoff !!
I didnt specify internal_port since i didnt want to expose services over at *.fly.dev. You can still connect to it via wireguard app (i just keep that on all the time) and your rails app can use the same exact .internal address.
1 Like
Not work for me… could not make HTTP request to instance: connection error: timed out