Help Center > > User Guide> Managing an Existing Cluster> MRS Multi-User Permission Management> Default Users of Clusters with Kerberos Authentication Enabled

Default Users of Clusters with Kerberos Authentication Enabled

Updated at: Mar 25, 2021 GMT+08:00

User Classification

The MRS cluster provides the following three types of users. Users are advised to periodically change the passwords. It is not recommended to use the default passwords.

User Type

Description

System user

  • User created on Manager for MRS cluster O&M and service scenarios. There are two types of users:
    • Human-machine user: used for Manager O&M scenarios and component client operation scenarios.
    • Machine-machine user: used for MRS cluster application development scenarios.
  • User who runs OMS processes.

Internal system user

Internal user who performs process communications, saves user group information, and associates user permissions.

Database user

  • User who manages OMS database and accesses data.
  • User who runs the database of service components (Hive, Hue, Loader, and DBService).

System User

  • User Idap of the OS is required in the MRS cluster. Do not delete this account. Otherwise, the cluster may not work properly. Password management policies are maintained by the operation users.
  • Reset the passwords when you change the passwords of user ommdba and user omm for the first time. Change the passwords periodically after retrieving them.

Type

Username

Initial Password

Description

System administrator of the MRS cluster

admin

Specified by the user during the cluster creation.

Manager administrator

with the following permissions:

  • Common HDFS and ZooKeeper user permissions.
  • Permissions to submit and query MapReduce and Yarn tasks, manage Yarn queues, and access the Yarn web UI.
  • Permissions to submit, query, activate, deactivate, reassign, delete topologies, and operate all topologies of the Storm service.
  • Permissions to create, delete, authorize, reassign, consume, write, and query topics of the Kafka service.

MRS cluster node OS user

omm

Randomly generated by the system.

Internal running user of the MRS cluster system. This user is an OS user generated on all nodes and does not require a unified password.

MRS cluster node OS user

root

Set by the user.

User for logging in to the node in the MRS cluster. This user is an OS user generated on all nodes.

Internal System Users

Do not delete the following internal system users. Otherwise, the cluster or components may not work properly.

Type

Default User

Initial Password

Description

Component running user

hdfs

Hdfs@123

This user is the HDFS system administrator and has the following permissions:

  1. File system operation permissions:
    • Views, modifies, and creates files.
    • Views and creates directories.
    • Views and modifies the groups where files belong.
    • Views and sets disk quotas for users.
  2. HDFS management operation permissions:
    • Views the web UI status.
    • Views and sets the active and standby HDFS status.
    • Enters and exits the HDFS in security mode.
    • Checks the HDFS file system.

hbase

Hbase@123

This user is the HBase system administrator and has the following permissions:

  • Cluster management permission: Enable and Disable operations on tables to trigger MajorCompact and ACL operations.
  • Grants and revokes permissions, and shuts down the cluster.
  • Table management permission: Creates, modifies, and deletes tables.
  • Data management permission: Reads and writes data in tables, column families, and columns.
  • Accesses the HBase web UI.

mapred

Mapred@123

This user is the MapReduce system administrator and has the following permissions:

  • Submits, stops, and views the MapReduce tasks.
  • Modifies the Yarn configuration parameters.
  • Accesses the Yarn and MapReduce web UI.

spark

Spark@123

This user is the Spark system administrator and has the following permissions:

  • Accesses the Spark web UI.
  • Submits Spark tasks.

User Group Information

Default User Group

Description

hadoop

Users added to this user group have the permission to submit tasks to all Yarn queues.

hbase

Common user group. Users added to this user group will not have any additional permission.

hive

Users added to this user group can use Hive.

spark

Common user group. Users added to this user group will not have any additional permission.

supergroup

Users added to this user group can have the administrator permission of HBase, HDFS, and Yarn and can use Hive.

check_sec_ldap

Used to test whether the active LDAP works properly. This user group is generated randomly in a test and automatically deleted after the test is complete. This is an internal system user group used only between components.

Manager_tenant

Tenant system user group, which is an internal system user group used only between components.

System_administrator

MRS cluster system administrator group, which is an internal system user group used only between components.

Manager_viewer

MRS Manager system viewer group, which is an internal system user group used only between components.

Manager_operator

MRS Manager system operator group, which is an internal system user group used only between components.

Manager_auditor

MRS Manager system auditor group, which is an internal system user group used only between components.

Manager_administrator

MRS Manager system administrator group, which is an internal system user group used only between components.

compcommon

Internal system group for accessing public resources in a cluster. All system users and system running users are added to this user group by default.

default_1000

User group created for tenants, which is an internal system user group used only between components.

kafka

Kafka common user group. Users added to this group need to be granted with read and write permission by users in the kafkaadmin group before accessing the desired topics.

kafkasuperuser

Users added to this group have permissions to read data from and write data to all topics.

kafkaadmin

Kafka administrator group. Users added to this group have the permissions to create, delete, authorize, as well as read from and write data to all topics.

storm

Storm common user group. Users added to this group have the permissions to submit topologies and manage their own topologies.

stormadmin

Storm administrator user group. Users added to this group have the permissions to submit topologies and manage their own topologies.

opentsdb

Common user group. Users added to this user group will not have any additional permission.

presto

Common user group. Users added to this user group will not have any additional permission.

flume

Common user group. Users added to this user group will not have any additional permission.

launcher-job

MRS internal group, which is used to submit jobs using V2 APIs.

OS User Group

Description

wheel

Primary group of MRS internal running user omm.

ficommon

MRS cluster common group that corresponds to compcommon for accessing public resource files stored in the OS of the cluster.

Database User

MRS cluster system database users include OMS database users and DBService database users.

Do not delete database users. Otherwise, the cluster or components may not work properly.

Type

Default User

Initial Password

Description

OMS database

ommdba

dbChangeMe@123456

OMS database administrator who performs maintenance operations, such as creating, starting, and stopping applications.

omm

ChangeMe@123456

User for accessing OMS database data.

DBService database

omm

dbserverAdmin@123

Administrator of the GaussDB database in the DBService component.

hive

HiveUser@

User for Hive to connect to the DBService database.

hue

HueUser@123

User for Hue to connect to the DBService database.

sqoop

SqoopUser@

User for Loader to connect to the DBService database.

ranger

RangerUser@

User for Ranger to connect to the DBService database.

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