1. Use the following command to open the RabbitMQ console:

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sudo rabbitmqctl add_user <username> <password>

For example, to add a user named guest, the command would be:

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sudo rabbitmqctl add_user guest guest_password

2. To add the user to the administrator group, run:
   rabbitmqctl set_user_tags guest administrator

Permissions and Groups

Permissions in RabbitMQ are tied to user roles. RabbitMQ has four default user roles: administrator, monitoring, policymaker, and management. Each role can be granted different access permissions.

The specific meanings of these four roles are as follows:

• administrator: Has full operational privileges, including managing users, virtual hosts, policies, connectors, and more.
• monitoring: Only allowed to view RabbitMQ status and statistics.
• policymaker: Has the authority to define and manage policies but cannot change user, virtual host, or plugin settings.
• management: Has the permission to view and manage RabbitMQ and its objects through the management interface.

Additionally, you can create custom permission groups by defining custom roles. To create a custom role, run the following commands:

1. sudo rabbitmqctl add_vhost <virtual_host>
2. sudo rabbitmqctl add_user <username> <password>
3. sudo rabbitmqctl set_permissions -p <virtual_host> <username> ".*" ".*" ".*"
4. sudo rabbitmqctl set_user_tags <username> <tag_list>

Where <tag_list> is a comma-separated list of tags, each representing a role. For example, to create a custom role for a user named myuser, the commands would be:

1. sudo rabbitmqctl add_vhost /myvhost
2. sudo rabbitmqctl add_user myuser mypassword
3. sudo rabbitmqctl set_permissions -p /myvhost myuser ".*" ".*" ".*"
4. sudo rabbitmqctl set_user_tags myuser mytag

You can then allocate access permissions for the new role by adding custom permissions in the RabbitMQ management interface or by defining them in a JSON configuration file.

It is important to note that granting full permissions may pose security risks, so it is advisable to impose appropriate restrictions based on actual needs.