Commands to create local mongo replica set (in PROD databases should be placed on different servers)

Run with MONGO_INITDB_ROOT_USERNAME and MONGO_INITDB_ROOT_PASSWORD

or add admin when database is running without authentication mode on

use admin

db.createUser({
    user: "admin",
     pwd: "password",
    roles:["root"]
 })

Connect to main db container

docker exec -it mongodb bash

Login as a admin

mongo --host mongodb:27017 -u admin -p <password> --authenticationDatabase admin

Check replica set status

rs.status() rs.conf()

Setup replica set config (add secondary database)

config = {
      "_id" : "rsMain",
      "members" : [
        {
          "_id" : 0,
          "host" : "mongodb:27017"
        },
        {
          "_id" : 1,
          "host" : "mongodb2:27017"
        },
      ]
      };

Initialize cluster

rs.initiate(config);

How to connect:

You must use directConnection=true connection option (only for test purpose)

mongodb://user:password@mongodb:27017/on_chain_data?replicaSet=rs0&authSource=on_chain_data&directConnection=true

Properly connection string

mongodb://user:password@<host>:27017/on_chain_data?replicaSet=rs0&authSource=on_chain_data