Connection to Mongodb fails from Strapi on Heroku

Question

I deployed Strapi CMS to Heroku, but I get this error

Error connecting to the Mongo database. Server selection timed out after 30000 ms

Log:

2020-05-27T17:43:55.398256+00:00 heroku[web.1]: Starting process with command `npm start`
2020-05-27T17:43:58.724121+00:00 app[web.1]: 
2020-05-27T17:43:58.724143+00:00 app[web.1]: > strapi-oskogen-mongodb@0.1.0 start /app
2020-05-27T17:43:58.724143+00:00 app[web.1]: > strapi start
2020-05-27T17:43:58.724143+00:00 app[web.1]: 
2020-05-27T17:44:02.234160+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'count' of module exports inside circular dependency
2020-05-27T17:44:02.234179+00:00 app[web.1]: (Use `node --trace-warnings ...` to show where the warning was created)
2020-05-27T17:44:02.234732+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency
2020-05-27T17:44:02.234879+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency
2020-05-27T17:44:02.235021+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'updateOne' of module exports inside circular dependency
2020-05-27T17:44:32.238852+00:00 app[web.1]: [2020-05-27T17:44:32.238Z] debug ⛔️ Server wasn't able to start properly.
2020-05-27T17:44:32.253150+00:00 app[web.1]: [2020-05-27T17:44:32.253Z] error Error connecting to the Mongo database. Server selection timed out after 30000 ms

My environments settings:

database.js

** server.js **

** response.js **

** config vars **

Site works well on localhost with both dev and prod environment. So it connects to MongoDB on Atlas and no problem with that.

I do not have any addons installed on Heroku.

** packages.json **

On Atlas side I opened all IPs in white list.

Any idea? Thank you! :)

Answer 1

My configuration for deployment of Strapi 3.0.1 on Heroku, both for develop and production environments:

module.exports = ({ env }) => ({
  defaultConnection: "default",
  connections: {
    default: {
      connector: "mongoose",
      settings: {
        uri: env("DATABASE_URI"),
        ssl: { rejectUnauthorized: false }
      },
      options: {
        ssl: true,
        authenticationDatabase: "",
        useUnifiedTopology: true,
        pool: {
          min: 0,
          max: 10,
          idleTimeoutMillis: 30000,
          createTimeoutMillis: 30000,
          acquireTimeoutMillis: 30000
        }
      },
    },
  },
});

server.js

module.exports = ({ env }) => ({
  host: env('HOST', '0.0.0.0'),
  port: env.int('PORT', 443), <-- 443 was critical to make it work on production
});

.env - local file

DATABASE_URI="mongodb+srv://OdegXXXXXUser:OXXXX20@odXXXXcluster-h9o2e.mongodb.net/odeXXXXXndb?retryWrites=true&w=majority"
HOST="0.0.0.0"
PORT="1337"

Vars on Heroku:

DATABASE_URI er identical as on localhost, the same database.

I hope it will help to anybody :-)