Error creating UDS listener: listen unix /opt/datadog/apm/inject/run/apm.socket

Context

• JElastic Cloud 8.4.1 (Infomaniak)
• Datadog agent Docker image version: 7.40.0

This occurred while configuring an agent to collect log information from other nodes in the environment.

Analysis

The Trace agent attempts to create a socket at /opt/datadog/apm/inject/run/apm.socket, but the path does not exist.

Running:

ls -ld /opt/datadog/apm/inject/run/

shows that the directory is missing.

Solution

I still don’t know why this directory was absent in this environment.

To fix the issue:

mkdir -p /opt/datadog/apm/inject/run/

Then restart the agent so it recreates the socket without error:

sudo systemctl restart datadog-agent