When attempting to restart the agent, you may encounter this error if the agent didn't shut down correctly:
* Starting Datadog Agent (using supervisord) datadog-agent
Error: Another program is already listening on a port that one of our HTTP servers is configured to use. Shut this program down first before starting supervisord.
To resolve this issue, please take the following steps:
- Stop the agent:
sudo /etc/init.d/datadog-agent stop
- Confirm that there are no processes running for the user dd-agent after stopping:
top -U dd-agent
- If you do find processes running under dd-agent, please kill them.
- After the above steps, please start the agent:
sudo /etc/init.d/datadog-agent start
If this doesn't solve your issue, please reach out to firstname.lastname@example.org.