Manage and query the mappings between users and user groups by running the UserGroupsMapping command - Object Storage Service

The UserGroupsMapping command is used to manage and query the mappings between users and user groups.

Prerequisites

A Hadoop environment, Hadoop cluster, or Hadoop client is created. For more information about how to install Hadoop, see Step 2: Create a Hadoop runtime environment.
OSS-HDFS is enabled for specific buckets. For more information, see Enable OSS-HDFS and grant access permissions.
JindoSDK 4.5.0 or later is installed and configured. For more information, see Connect non-EMR clusters to OSS-HDFS.

Step 1: Configure environment variables

Connect to an ECS instance. For more information, see Connect to an ECS instance.
Go to the bin directory of the installed JindoSDK JAR package.
```
cd jindosdk-x.x.x/bin/
```
Note
x.x.x indicates the version number of the JindoSDK JAR package.
Grant read and write permissions to the jindo-util file in the bin directory.
```
chmod 700 jindo-util
```
Rename the jindo-util file to jindo.
```
mv jindo-util jindo
```

Create a configuration file named jindosdk.cfg, and then add the following parameters to the configuration file.

[common] Retain the following default configurations. 
logger.dir = /tmp/jindo-util/
logger.sync = false
logger.consolelogger = false
logger.level = 0
logger.verbose = 0
logger.cleaner.enable = true
hadoopConf.enable = false

[jindosdk] Specify the following parameters. 
<!-- In this example, the China (Hangzhou) region is used. Specify your actual region.  -->
fs.oss.endpoint = cn-hangzhou.oss-dls.aliyuncs.com
<! -- Configure the AccessKey ID and AccessKey secret that is used to access OSS-HDFS.  -->
fs.oss.accessKeyId = LTAI********   
fs.oss.accessKeySecret = KZo1********

Configure environment variables.
```
export JINDOSDK_CONF_DIR=<JINDOSDK_CONF_DIR>
```
Set <JINDOSDK_CONF_DIR> to the absolute path of the jindosdk.cfg configuration file.

Step 2: Manage the mappings between users and user groups

Map users to user groups

Command syntax

./jindo admin -addUserGroupsMapping \
                [-dlsUri <uri>] \
                [-user <user>] \
                [-groups <group1,group2...>]

Example

You can run the following command to map user1 to group1 and group2:

./jindo admin -addUserGroupsMapping \
                -dlsUri oss://examplebucket.cn-shanghai.oss-dls.aliyuncs.com \
                -user user1 \
                -groups group1,group2

Query the user groups to which users are mapped

Command syntax

./jindo admin -listUserGroupsMappings \
                [-dlsUri <dlsUri>] \
                [-maxKeys <maxKeys>] \
                [-marker <marker>]

Example
You can run the following command to query the user groups to which 10 users whose names contain the test string in the path specified by <dlsUri> are mapped:
```
./jindo admin -listUserGroupsMappings \
                -dlsUri oss://examplebucket.cn-shanghai.oss-dls.aliyuncs.com \
                -maxKeys 10 \
                -marker test
```
The -maxKeys and-marker options are both optional.
- The -maxKeys option is used to specify the number of users that you want to query.
- The -marker option is used to filter users whose names contain a specific string.

Delete the mappings between users and user groups

Command syntax

./jindo admin -deleteUserGroupsMapping \
                 [-dlsUri <uri>] \
                 [-user <user>]

Example

You can run the following command to delete the mappings between user1 and the user groups to which user1 belongs:

./jindo ad -deleteUserGroupsMapping \
                -dlsUri oss://examplebucket.cn-shanghai.oss-dls.aliyuncs.com \
                -user user1