Add the Datadog Tracing Library

Docs > APM > Application Instrumentation > Add the Datadog Tracing Library

Overview

To automatically instrument your application with Datadog libraries:

Install and configure the Agent.
Add the Datadog tracing library to your code.

Install and configure the Agent

Install and configure the Datadog Agent to receive traces from your instrumented application. By default, the Datadog Agent is configured to receive traces in your datadog.yaml file under apm_config with enabled: true and listens for trace data at http://localhost:8126.

For containerized environments, follow the links below to enable trace collection within the Datadog Agent.

Containers

Set apm_non_local_traffic: true in the apm_config section of your main datadog.yaml configuration file.
See the specific setup instructions to ensure that the Agent is configured to receive traces in a containerized environment:

The trace client attempts to send traces to the Unix domain socket /var/run/datadog/apm.socket by default. If the socket does not exist, traces are sent to http://localhost:8126.
If a different socket, host, or port is required, use the DD_TRACE_AGENT_URL environment variable. For example:
```
DD_TRACE_AGENT_URL=http://custom-hostname:1234
DD_TRACE_AGENT_URL=unix:///var/run/datadog/apm.socket
```
Similarly, the trace client attempts to send stats to the /var/run/datadog/dsd.socket Unix domain socket. If the socket does not exist, then stats are sent to http://localhost:8125.