IMPORTANT:

• setups should have aligned authorization settings, we should add a keyFile to the security and share these between server to maintain security

docker-compose up -d

Temporarily disable mongo authorization in the web01_mongo.conf file and

security:
    #authorization: enabled
    #keyFile: /keyfile
    authorization: disabled

Create root user:

docker-compose restart
use admin
rs.initiate()
db.createUser(
  {
    user: "webdev",
    pwd: "abc",
    roles: [ { role: "root", db: "admin" } ]
  }
)

Re-enable authorization (also keyFile) in web01_mongo.conf and restart docker containers

docker-compose restart

Auth as admin:

db.auth('webdev', 'abc')

Create data:

use profile2connect
db.profiles.insert({"_id": "test", "username": "Kevin"})

NOTE: Make sure all database files of secondary are removed to prepare it to become secondary

Add secondary member to rs:

rs.add( { host: "mongo_ded01", priority: 0, votes: 0 } )

Check rs status:

rs.status()

Set slaveOk=true to perform queries on secondary:

rs.slaveOk()

Remove the secondary as member of the replicaset

rs.remove("mongo_ded01:27017")

The secondary now becomes "OTHER" and becomes unavailable, now change the rs config there to set itself as primary:

cfg = rs.conf()
cfg.members[0].host = 'mongo_ded01:27017'
rs.reconfig(cfg, {force : true})