How to setup by Using MongoDB docker

[cn3c3p]

I meet some problem when i Using MongoDB docker to setup.

1. I try:
   docker run -d --name mongo-server -v $PWD/databases:/data/db -p 27017:27017 mongo
   docker run -d
   -p 5000:5000
   --name quokka
   --link mongo-server:mongo
   --env ME_CONFIG_MONGODB_ADMINUSERNAME='' \ ?
   --env ME_CONFIG_MONGODB_ADMINPASSWORD='' \ ?
   my-base

---

2. When make devserver, i change quokka.yml:DB to:
   quokka:
   DB:
   system: mongodb
   name: my_database
   host: 127.0.0.1
   port: 27017

3. After running quokka again:

while scanning a simple key
in "quokka.yml", line 533, column 6
could not find expected ':'
in "quokka.yml", line 534, column 6

4. how to change quokka.yml:DB ?