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Why is the Machine Agent not reporting?

Updated  ‎6/13/18

 

Users who are troubleshooting scenarios where the AppDynamics Standalone Machine Agent is not reporting metrics as expected will find causes and solutions here. The following solutions apply to versions 4.4 and higher.

 

Contents:

 

Problem: Installation issues

 

If both an App Server Agent and the Machine Agent are unzipped into the same directory, important files will be overwritten, such as the log4j.xml file.

 

Solution:

 

When unzipping the App Agent or Machine Agent zip files, make sure to use different directories.

 

 

 

Problem: Host ID for App Server Agent and Machine Agent do not match 

 

Both the App Server Agent and the Machine Agent use the Java API to get the host ID. The results from the API can be inconsistent and the same JVM can sometimes return a different value for the same machine each time the Machine Agent is restarted. 

 

When the host ID is then registered with the Controller the app server agent and the machine agent can be assigned different host IDs even though they are running on the same machine.

 

Solution:

 

Reset the hostname for the Machine Agent by running the agent with the

-Dappdynamics.agent.uniqueHostId JVM parameter. Set the host ID to be the same as the one the App Server Agent is using. 

 

 

Problem: Difficulty with machine hostname resolution

 

If the following error is seen in the Machine Agent log file, the cause is hostname resolution which affects Machine Agent startup and registration.

 

.ERROR XMLConfigManager - Error in Default Host Identifier Resolver resolving host name
java.net.UnknownHostException: log-aggregate01: log-aggregate01
 

Solution:

 

1. Verify a valid hostname in the /etc/hosts file.
  • Example:
localhost    log-aggregate01
127.0.0.1         log-aggregate01
2. Save the changes.
3. Restart the Machine Agent.
 
 
 
 
Originally published on 2/10/2015
Updated for version 4.4 on 6/8/2017
Version history
Revision #:
23 of 23
Last update:
‎07-31-2018 09:37 AM
Updated by:
 
Labels (1)
Comments
John.Aronson

I'm seeing mixed messages about the default machine agent metric limit in newer versions. I think it's 450 in version 4.2.4 and latrer. Can this be clarified?

Doug.Bothwell

Hi john.aronson, I've updated this article to clarify that the default maximum limit for Standalone machine Agents in 4.2.4 and higher. Are there other areas where you're seeing mixed messages? I updated the product 4.2, 4.3, and 4.4 docs a few weeks ago to ensure this default max is correct. 

Erin

I have updated this article to remove the old outdated information and keep everything applicable to 4.4 and higher.