Docker image: (example-mongodb) the rs.initiate command in init-inventory.sh is wrong.

If my understanding is not wrong.
In replica set mode, the mongodb connector will lookup all node host in rs.conf().
This means: we must make sure the host that added by commnad `rs.add('host:port')` can be accessed by the connector.

However, in the init-inventory.sh, used the `hostname` as primary host （see attached hostname.jpg）.

In addition, why must we make sure all the host can be accessed by the connector ?