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To authenticate a client in MongoDB, you must add a corresponding user to MongoDB.
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要在MongoDB中认证客户端，必须向MongoDB数据库中添加相应的用户。
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When adding a user, you create the user in a specific database. This database is the authentication database for the user.
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IMPORTANT
To create a shard local administrative user, connect directly to the shard and create the user. MongoDB stores shard local users in the admin database of the shard itself.
The localhost exception applies only when there are no users created in the MongoDB instance.
Create an administrative user, or
创建一个管理用户，或
译者：管祥青
To add a user, MongoDB provides the method. When adding a user, you can assign to the user in order to grant privileges.
The first user created in the database should be a user administrator who has the privileges to manage other users. See .
You can also update existing users, such as to change password and grant or revoke roles. For a full list of user management methods, see .
A user is uniquely identified by the user’s name and associated authentication database. Starting in MongoDB 4.0.9, a users managed by MongoDB are assigned a unique userId.
添加一个用户，MongoDB提供 方法，当添加一个用户，同时需要分配角色 来向用户授予特权。
注意 创建第一个用户，需要具有管理其他用户特权的管理员用户。请参见 。 你还可以更新现有用户，例如更改密码和授予或撤销角色。有关用户管理方法的完整列表，请参见 。 用户是由用户名和关联的身份验证数据库唯一标识的。从MongoDB 4.0.9开始，MongoDB管理的用户被分配一个唯一的 userId。
A user can have privileges across different databases; that is, a user’s privileges are not limited to their authentication database. By assigning to the user roles in other databases, a user created in one database can have permissions to act on other databases. For more information on roles, see .
The user’s name and authentication database serve as a unique identifier for that user. That is, if two users have the same name but are created in different databases, they are two separate users. If you intend to have a single user with permissions on multiple databases, create a single user with roles in the applicable databases instead of creating the user multiple times in different databases.
( , _)_Starting in version 4.0.9, MongoDB associates a user with a unique userId upon creation in MongoDB. created on the LDAP server do not have an associated document in the collection, and hence, do not have a field associated with them.
添加用户时，在特定数据库中创建用户。这个数据库是该用户的身份验证数据库。 一个用户可以拥有跨不同数据库进行授权；也就是说，用户的授权并不局限于他们的身份验证数据库。 通过将用户角色分配给其他数据库中的用户，在一个数据库中创建的用户可以拥有对其他数据库进行操作的权限。有关角色的更多信息，请参见 。 用户名和身份验证数据库作为该用户的唯一标识符。 ，也就是说，如果两个用户具有相同的名称，但在不同的数据库中创建，那么他们是两个独立的用户。如果您打算拥有一个对多个数据库具有权限的用户，请创建一个具有适用数据库中的角色的用户，而不是在不同的数据库中多次创建该用户。
To authenticate as a user, you must provide a username, password, and the associated with that user.
To authenticate using the shell, either:
Use the command-line authentication options (, , and ) when connecting to the or instance, or
Connect first to the or instance, and then run the command or the method against the .
Authenticating multiple times as different users does not drop the credentials of previously-authenticated users. This may lead to a connection having more permissions than intended by the user, and causes operations within a to raise an error.
For examples of authenticating using a MongoDB driver, see the .
作为用户进行身份验证，您必须提供与该用户相关联的用户名、密码。详情请看 。 使用 Shell命令进行认证:
使用 命令进行身份验证，选项为( , , 和 ),之后连接到 或 实例,或
首先连接到 或 实例，然后运行 命令或 方法,详情请参考 。
重要的 不同用户多次身份验证，因为后面的用户不会删除之前经过身份验证的用户的凭据。这可能导致连接时，拥有比用户预期更多的权限，并导致 中的操作引发错误。
有关使用MongoDB驱动程序进行身份验证的示例，请参阅 。
For users created in MongoDB, MongoDB stores all user information, including , , and the , in the collection in the admin database.
Do not access this collection directly but instead use the .
在MongoDB创建的用户, MongoDB存储所有用户信息,包括 , ,和 , 在 集合的admin数据库中。 不要直接访问集合，而是使用 。
To create users for a sharded cluster, connect to the instance and add the users. Clients then authenticate these users through the instances. In sharded clusters, MongoDB stores user configuration data in the admin database of the .
为分片集群创建用户，先连接到 实例并添加用户。然后客户端通过 实例对这些用户进行身份验证。在分片集群中，MongoDB将用户配置数据存储在 的admin 数据库中。
However, some maintenance operations, such as , , , require direct connections to specific shards in a sharded cluster. To perform these operations, you must connect directly to the shard and authenticate as a shard local administrative user.
These shard local users are completely independent from the users added to the sharded cluster via . Shard local users are local to the shard and are inaccessible by .
Direct connections to a shard should only be for shard-specific maintenance and configuration. In general, clients should connect to the sharded cluster through the .
一些维护操作,如 , , ,在分片集群中，需要直接连接到特定的分片。要执行这些操作，您必须直接连接到特定分片，并作为_本地分片_管理员用户进行身份验证。 创建一个_本地分片_管理员用户，请直接连接到该分片并创建该用户。MongoDB将_本地分片_用户存储在分片本身的 admin 数据库中。 这些_本地分片_用户完全独立于通过 添加到分片集群的用户。_本地分片_用户是分片的本地用户，并通过命令 无法访问。 与分片直接连接应该仅用于分片特定的维护和配置。通常，客户端应该通过 连接到分片集群。
The localhost exception allows you to enable access control and then create the first user in the system. With the localhost exception, after you enable access control, connect to the localhost interface and create the first user in the admin database. The first user must have privileges to create other users, such as a user with the or role. Connections using the localhost exception only have access to create the first user on the admin database.
Changed in version 3.4: MongoDB 3.4 extended the localhost exception to permit execution of the method. This method allows users authorizing via LDAP to create a role inside of MongoDB that maps to a role defined in LDAP. See for more information.
In the case of a sharded cluster, the localhost exception applies to each shard individually as well as to the cluster as a whole. Once you create a sharded cluster and add a user administrator through the instance, you must still prevent unauthorized access to the individual shards. Follow one of the following steps for each shard in your cluster:
Disable the localhost exception at startup. To disable the localhost exception, set the parameter to 0.
本地主机异常允许您启用访问控制，然后在系统中创建第一个用户。对于本地主机异常，在启用访问控制后，连接到本地主机接口并在 admin 数据库中创建第一个用户。第一个用户必须拥有创建其他用户的特权，例如具有 或 角色的用户。使用本地异常连接可以在 admin 数据库上创建第一个用户。 在3.4版本中: MongoDB 3.4扩展了本地主机异常，允许执行 方法。该方法允许通过LDAP授权的用户在MongoDB中创建一个映射到LDAP中自定义的角色的角色。有关更多信息，请参见 。 本地主机异常仅在MongoDB实例中没有创建用户时的场景。 在分片集群的情况下，本地主机异常分别应用于每个分片，也应用于整个集群。一旦您创建了一个分片集群并通过 实例添加了一个管理员用户，您仍然不能访问单个分片。要访问集群中单个分片，对集群中的每个分片执行操作步骤如下:
在启动时禁用localhost异常。要禁用本地异常，请将 参数设置为0。
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