Thanks for this!
I have a ton of problems with upstash redis and this feels like a good alternative.
I had to change one thing in Procfile.fly:
- web: bin/rails fly:server
+ web: bin/rails server -p 8080
Otherwise you get in a loop: Procfile calls fly:server which calls Procfile which calls fly:server…
No clue why the ENV[“PORT”] is not being picked up though 
The other problem popped up that sidekiq (which I run in a separate process) could now not connect to redis://localhost:6379/1.
So I added that to Procfile as well and it seems to be working well.
I also added a new redis disk with
fly vol create redis
and added
sed -i 's/^dir \/var\/lib\/redis/dir \/redis/' /etc/redis/redis.conf &&\
to use it.
Here’s the full diff: Run Redis internally · miharekar/decent-visualizer@4e4f7c5 · GitHub
I think I now have a working app? 