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mongodb 安装完后默认是不开启 auth 模块的，普通用户和超级管理员均不通过认证就可操作。当然裸奔有风险，安全起见还是开启 auth 模块。
首先需要了解下面几点：
1、mongodb 是没有默认管理员账号，所以要先添加管理员账号，然后开启权限认证。
2、切换到 admin 数据库，添加的账号才是管理员账号。
3、用户只能在用户所在数据库登录，包括管理员账号。
4、管理员可以管理所有数据库，但是不能直接管理其他数据库，要先在 admin 数据库认证后才可以。这一点比较怪。
1. 用户权限角色说明
1.1 Database User Roles
read
允许用户读取指定数据库
Provides the ability to read data on allnon-system collections and on the following system collections: system.indexes,system.js, and system.namespaces collections.
拥有如下权限：
aggregate,checkShardingIndex,cloneCollectionAsCapped,collStats
count,dataSize,dbHash,dbStats,distinct,filemd5
geoNear,geoSearch,geoWalk,group
mapReduce (inline output only.),text (beta feature.)
readWrite
允许用户读写指定数据库
Provides all the privileges of the readrole and the ability to modify data on all non-system collections and thesystem.js collection.
除了具有 read 权限，还拥有以下权限：
cloneCollection (as the target database.),convertToCapped
create (and to create collections implicitly.)
drop(),dropIndexes,emptycapped,ensureIndex()
findAndModify,mapReduce (output to a collection.)
renameCollection (within the same database.)
read 和 readWrite 只要就是对库中表的操作权限
1.2 Database Administration Roles
dbAdmin
允许用户在指定数据库中执行管理函数，如索引创建、删除，查看统计或访问 system.profile
Provides the ability to performadministrative tasks such as schema-related tasks, indexing, gatheringstatistics. This role does not grant privileges for user and role management.
拥有如下权限：
clean,collMod,collStats,compact,convertToCapped
create,db.createCollection(),dbStats,drop(),dropIndexes,ensureIndex()
indexStats,profile,reIndex,renameCollection (within a single database.),validate
dbOwner
Provides the ability to perform anyadministrative action on the database. This role combines the privilegesgranted by the readWrite, dbAdmin and userAdmin roles.
userAdmin
允许用户向 system.users 集合写入，可以找指定数据库里创建、删除和管理用户
Provides the ability to create and modifyroles and users on the current database. Since the userAdmin role allows usersto grant any privilege to any user, including themselves, the role alsoindirectly provides superuser access to either the database or, if scoped tothe admin database, the cluster.
1.3 Cluster Administration Roles
clusterAdmin
只在 admin 数据库中可用，赋予用户所有分片和复制集相关函数的管理权限。
Provides the greatest cluster-managementaccess. This role combines the privileges granted by the clusterManager,clusterMonitor, and hostManager roles. Additionally, the role provides thedropDatabase action.
拥有如下权限：
addShard,closeAllDatabases,connPoolStats,connPoolSync,_cpuProfilerStart
_cpuProfilerStop,cursorInfo,diagLogging,dropDatabase
enableSharding,flushRouterConfig,fsync,db.fsyncUnlock()
getCmdLineOpts,getLog,getParameter,getShardMap,getShardVersion
hostInfo,db.currentOp(),db.killOp(),listDatabases,listShards
logRotate,moveChunk,movePrimary,netstat,removeShard,unsetSharding
repairDatabase,replSetFreeze,replSetGetStatus,replSetInitiate
replSetMaintenance,replSetReconfig,replSetStepDown,replSetSyncFrom
resync,serverStatus,setParameter,setShardVersion,shardCollection
shardingState,shutdown,splitChunk,splitVector,split,top,touch
clusterManager
Provides management and monitoring actionson the cluster. A user with this role can access the config and localdatabases, which are used in sharding and replication, respectively.
clusterMonitor
Provides read-only access to monitoringtools, such as the MongoDB Cloud Manager and Ops Manager monitoring agent.
hostManager
Provides the ability to monitor and manageservers.
1.4 Backup and Restoration Roles
backup
Provides privileges needed to back up data.This role provides sufficient privileges to use the MongoDB Cloud Managerbackup agent, Ops Manager backup agent, or to use mongodump.
restore
Provides privileges needed to restore datawith mongorestore without the –oplogReplay option or without system.profilecollection data.
1.5 All-Database Roles
readAnyDatabase
只在 admin 数据库中可用，赋予用户所有数据库的读权限
Provides the same read-only permissions asread, except it applies to all but the local and config databases in thecluster. The role also provides the listDatabases action on the cluster as awhole.
readWriteAnyDatabase
只在 admin 数据库中可用，赋予用户所有数据库的读写权限
Provides the same read and writepermissions as readWrite, except it applies to all but the local and configdatabases in the cluster. The role also provides the listDatabases action onthe cluster as a whole.
userAdminAnyDatabase
只在 admin 数据库中可用，赋予用户所有数据库的 userAdmin 权限
Provides the same access to useradministration operations as userAdmin, except it applies to all but the localand config databases in the cluster.
Since the userAdminAnyDatabase role allowsusers to grant any privilege to any user, including themselves, the role alsoindirectly provides superuser access.
dbAdminAnyDatabase
只在 admin 数据库中可用，赋予用户所有数据库的 dbAdmin 权限。
Provides the same access to databaseadministration operations as dbAdmin, except it applies to all but the localand config databases in the cluster. The role also provides the listDatabasesaction on the cluster as a whole.
1.6 Superuser Roles
root
只在 admin 数据库中可用。超级账号，超级权限
Provides access to the operations and allthe resources of the readWriteAnyDatabase, dbAdminAnyDatabase,userAdminAnyDatabase, clusterAdmin, restore, and backup combined.
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