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7.4. Interactions with System Users for Agents and Resources

The agent runs as a specific system user, and so do servers such as JBoss and Apache which are managed by JBoss ON. The general assumption with many of the agent management tasks, including discovery, is that the agent user is the same as the resource user. If the users are different, then that can have an impact on how resources can be discovered and managed.
The common types of servers which JBoss ON manages are:
  • JBoss EAP servers
  • PostgreSQL databases
  • Tomcat servers
  • Apache servers
  • Generic JVMs
For some management operations initiated by the JBoss ON agent, the agent system user is never even involved. For example, the JBoss EAP plug-in connects to the EAP instance using authentication mechanisms managed by JBoss EAP itself, so no system ACLs or user permissions are required. As long as the user can access the JBoss EAP instance, everything works.
Expand
Table 17. Cheat Sheet for Agent and Resource Users
Resource User Information
PostgreSQL No effect for monitoring and discovery.
The agent user must have read/write permissions to the PostgreSQL configuration file for configuration viewing and editing.
Apache No effect for monitoring and discovery.
The agent user must have read/write permissions to the Apache configuration file for configuration viewing and editing.
Tomcat Must use the same user or can't be discovered
JMX server or JVM Different users are fine when using JMX remoting; cannot be discovered with different users and the attach API
JBoss AS/EAP Different users are all right, but requires read permissions on run.jar and execute and search permission on all ancestor directories for run.jar

7.4.1. The Agent User
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There is a general assumption that the agent runs as the same user as the managed resources, and this is the cleanest option for configuration.
When the JBoss ON agent is installed from the agent installer JAR file, the system user and group who own the agent installation files is the same user who installs the JAR. So, a special system user can be created or selected, and then the agent can be installed by that user.
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