version: '2'
services:
 mongo:
  # restart: always
  image: mongo:3.2
  command: [--auth]
  ports:
   - "37017:27017"
  volumes:
   - /data/db

docker-compose up -d
#----------
# Result：
#----------
# Creating mongodb_mongo_1
docker-compose ps
#----------
# Result：
#----------
#   Name        Command     State      Ports
# --------------------------------------------------------------------------
# mongodb_mongo_1  /entrypoint.sh --auth  Up   0.0.0.0:37017->27017/tcp

docker exec -it mongodb_mongo_1 mongo admin
#----------
# Result：
#----------
# MongoDB shell version: 3.2.12
# connecting to: admin
# Welcome to the MongoDB shell.
# For interactive help, type "help".
# For more comprehensive documentation, see
#  http://docs.mongodb.org/
# Questions? Try the support group
#  http://groups.google.com/group/mongodb-user

db.createUser({ 
  user: 'mongo-admin', 
  pwd: 'admin-initial-password', 
  roles: [ { role: "userAdminAnyDatabase", db: "admin" } ] });
#----------
# Result：
#----------
Successfully added user: {
  "user" : "mongo-admin",
  "roles" : [
    {
      "role" : "userAdminAnyDatabase",
      "db" : "admin"
    }
  ]
}

docker exec -it mongodb_mongo_1 mongo admin
#----------
# Result：
#----------
MongoDB shell version: 3.2.12
connecting to: admin

db.auth("mongo-admin","admin-initial-password")

# Step1: switch to the specified database:
use octblog
# Step2: create a user
db.createUser(
 {
  user: "gevin",
  pwd: "gevin",
  roles: [ { role: "readWrite", db: "octblog" },
       { role: "readWrite", db: "octblog-log" } ]
 }
)
#----------
# Result：
#----------
#Successfully added user: {
#  "user" : "gevin",
#  "roles" : [
#    {
#      "role" : "readWrite",
#      "db" : "octblog"
#    },
#    {
#      "role" : "readWrite",
#      "db" : "octblog-log"
#    }
#  ]
#}