Error connecting Nodejs app to Redis on Heroku

Question

I have a Nodejs application that I was using Redis for to handle the sessions. I am using connect-redis npm package. Now, I deployed the same Nodejs app to heroku but I do not know if there is a way to get a Redis server going along side my Nodejs application in Heroku.

I get the following error on heroku logs --tail

2020-04-09T03:40:31.880266+00:00 app[web.1]: throw er; // Unhandled 'error' event 2020-04-09T03:40:31.880267+00:00 app[web.1]: ^ 2020-04-09T03:40:31.880267+00:00 app[web.1]: 2020-04-09T03:40:31.880267+00:00 app[web.1]: Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 127.0.0.1:6379 2020-04-09T03:40:31.880268+00:00 app[web.1]: at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1137:16) 2020-04-09T03:40:31.880268+00:00 app[web.1]: Emitted 'error' event on RedisClient instance at: 2020-04-09T03:40:31.880268+00:00 app[web.1]: at RedisClient.on_error (/app/node_modules/redis/index.js:341:14) 2020-04-09T03:40:31.880269+00:00 app[web.1]: at Socket. (/app/node_modules/redis/index.js:222:14) 2020-04-09T03:40:31.880269+00:00 app[web.1]: at Socket.emit (events.js:311:20) 2020-04-09T03:40:31.880269+00:00 app[web.1]: at emitErrorNT (internal/streams/destroy.js:92:8) 2020-04-09T03:40:31.880270+00:00 app[web.1]: at emitErrorAndCloseNT (internal/streams/destroy.js:60:3) 2020-04-09T03:40:31.880270+00:00 app[web.1]: at processTicksAndRejections (internal/process/task_queues.js:84:21) { 2020-04-09T03:40:31.880278+00:00 app[web.1]: errno: 'ECONNREFUSED', 2020-04-09T03:40:31.880279+00:00 app[web.1]: code: 'ECONNREFUSED', 2020-04-09T03:40:31.880279+00:00 app[web.1]: syscall: 'connect', 2020-04-09T03:40:31.880279+00:00 app[web.1]: address: '127.0.0.1', 2020-04-09T03:40:31.880280+00:00 app[web.1]: port: 6379 2020-04-09T03:40:31.880280+00:00 app[web.1]: }

I also added an addon called Heroku Redis but I get the same error message

ukaliko ukaliko · Accepted Answer · 2020-08-06T15:07:21

After three days looking for an answer to this error, I will share what worked for me, get the vision. I'm using this Heroku Redis add-on you can install via heroku-cli or directly on the dashboard on the heroku website: Resources> click Button "Find more add-ons" and search for Heroku Redis

Via heroku-cli:

heroku addons:create heroku-redis:hobby-dev

Create the BD Redis Get the variable data on the heroku page:

Resources> Add-ons> Heroku Redis> Settings
Create and configure as Redis environment variables in heroku:

REDIS_PASSWORD - provide a password generated by heroku:

REDIS_URL - provide a host created by heroku

REDIS_PORT - provide a port generated by heroku

Content of the Redis configuration file in the app:

redis.js

if (process.env.NODE_ENV === 'development') {
  export default {
   host: process.env.REDIS_URL,
   port: process.env.REDIS_PORT,
 };
} else {
  export default {
   host: process.env.REDIS_URL,
   port: process.env.REDIS_PORT,
   password: process.env.REDIS_PASSWORD,
  };
};

Reference: https://devcenter.heroku.com/articles

Error connecting Nodejs app to Redis on Heroku

2 Answers