What are the key points for setting Debian Hadoop permissions

When setting Hadoop permissions on Debian, you need to consider the following points:

1. User and user group management :

   • Create users and user groups for management in the cluster. Users and groupadd commands can be used to create users and user groups.
   • Set the user's home directory and login shell, and use the usermod command to modify user information.

2. File and directory permission settings :

   • Use the ls -l command to view permissions for files or directories.
   • Use the chmod command to modify permissions, you can use digital mode or symbolic mode. For example, chmod 755 file.txt gives owners read, write, and execute permissions, group and other users read and execute permissions.
   • Use the chown and chgrp commands to modify the owner and group of a file or directory.

3. Hadoop specific permission settings :

   • ServiceLevel Authorization : Configure the hadoop.security.authorization property in core-site.xml and enable ServiceLevel Authorization to control whether the user can access the specified service.
   • Access Control on Job Queues : Configure the mapred.acls.enabled property in mapred-site.xml and enable Access Control on Job Queues to control the permissions of mapred queues.
   • DFSPermission : Configure the dfs.permission property in hdfs-site.xml to enable file permission verification to control user access to data.

4. Authorization mechanism :

   • Edit the /etc/sudoers file, allowing specific users to execute specific root commands for passwordless login and administrator permissions.

5. Authentication and Authorization :

   • Use Kerberos authentication to ensure that only authenticated users can access the data.
   • Use Hadoop's Access Control Lists (ACLs) to control access to data.

Please note that when modifying the critical system configuration or performing sensitive operations, it is recommended to operate with caution and back up important data.

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