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Error connecting Nodejs app to Redis on Heroku

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

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2

Answers


  1. 0

    On Heroku, your REDIS server is NO LONGER on 127.0.0.1

    I’d recommend finding out the IP address of the Redis server on Heroku.

    And change your Node.JS configuration for Redis server.

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  2. 0

    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

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