默认情况下，mongodb没有启用访问控制，因此没有默认用户或密码.

By default mongodb has no enabled access control, so there is no default user or password.

要启用访问控制，请使用命令行选项--auth或security.authorization配置文件设置.

To enable access control, use either the command line option --auth or security.authorization configuration file setting.

您可以使用以下过程，或在网站上的启用身份验证中. MongoDB文档.

You can use the following procedure or refer to Enabling Auth in the MongoDB docs.

1. 在没有访问控制的情况下启动MongoDB.

1. Start MongoDB without access control.

mongod --port 27017 --dbpath /data/db1

mongo --port 27017

use admin
db.createUser(
  {
    user: "myUserAdmin",
    pwd: "abc123",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

mongod --auth --port 27017 --dbpath /data/db1

mongo --port 27017 -u "myUserAdmin" -p "abc123" \
  --authenticationDatabase "admin"