Heroku上的Rails应用程序无法连接到RDS

Question

I'm trying to get a Rails app that's hosted on Heroku, and currently using Heroku-Postges, to instead use an instance of AWS/RDS as its datastore. The problem is that the rails app doesn't seem able get a connection and it just hangs every time it would talk to the DB.

I gather from reading a few articles about this that the way to point Heroku to it's DB is with a DATABASE_URL param in the form postgres://[dbuser]:[dbpass]@[subhost].amazonaws.com:5432/[dbname] .

Is that how it works? I'm confused about how it overrides the database.yml values.

I've also tried following instructions having to do with downloading a certificate and storing it in the config/ca folder and then appending ?sslca=config/ca/rds-ssl-ca-cert.pem&sslmode=require&encrypt=true .

I'm able to connect directly to the RDS instance using PGAdmin, so I know it's up, running and accessible.

Is there any other way I can get visibility into what's going on here?

Answer 1

You don't need to fiddle with your database.yml values on Heroku.

But I assume you've already seen this tutorial on Heroku: Authorizing to RDS ; you'll need to set up the security groups for the RDS to accept incoming traffic from -all- IPs.

After opening it up to all IPs, you should also limit the RDS to accept only SSL as the article suggests.

More information for each RDS type (Mysql, Postgres eg) can be found at the AWS docs .