本地测试结果如下
|- D:\mongodata\db1
|—— mongo.conf
|- D:\mongodata\db2
|—— mongo.conf

mongo.conf

storage:
  dbPath: D:\mongodata\db1
  journal:
    enabled: true

systemLog:
  destination: file
  logAppend: true
  path:  D:\mongodata\db1\mongod.log


net:
  port: 28017
  bindIp: 127.0.0.1


replication:
  replSetName: rs0