How to connect to redis with dokku and flask? - flask

Question

I wanted to use redis with dokku and flask. First issue was installing current version of dokku, i am using latest version from repo now.
Second problem is showing in Flask debugger:
redis.exceptions.ConnectionError
ConnectionError: Error 111 connecting to None:6379. Connection refused.
I set redis url and port in Flask:
app.config['REDIS_URL'] = 'IP:32768'
-----> Checking status of Redis
remote: Found image redis/landing
remote: Checking status...stopped.
remote: Launching redis/landing...COMMAND: docker run -v /home/dokku/.redis/volume-landing:/var/lib/redis -p 6379 -d redis/landing /bin/start_redis.sh
-----> Setting config vars
REDIS_URL: redis://IP:6379
REDIS_IP: IP
REDIS_PORT: 6379
Any idea? REDIS_URL should be set in different way?
This code works ok in localhost:
https://github.com/kwikiel/bounce
(with ['REDIS_IP'] = '172.17.0.13' set to 127.0.0.1)
Problem appears when i try to connect with redis dokku.

Answer 1

Steps to use redis with flask and dokku:
Install redis plugin:
cd /var/lib/dokku/plugins
git clone https://github.com/ohardy/dokku-redis redis
dokku plugins-install
Link your redis container to application container
dokku redis:create [name of app container]
You will receive info about environmental variables that you will have to set - for example:
Host: 172.17.0.91
Public port: 32771
Then set these settings in Flask (or other framework)
app.config['REDIS_URL'] = 'redis://172.17.0.91:6379'
app.config['REDIS_IP'] = '172.17.0.91'
app.config['REDIS_PORT'] = '6379'
Complete example of redis database used with Flask app (A/B testing in Flask):
https://github.com/kwikiel/bounce