Instrumenting Apache HTTP Server
Datadog provides an HTTPd module to enhance Apache HTTP Server and IHS HTTP Server capabilities with APM Tracing.
Since IHS HTTP Server is essentially a wrapper of the Apache HTTP Server, the module can also be used with IHS without any modifications.
Note: Only Apache HTTP Server 2.4.x for x86_64 architecture is supported.
The module is provided as a shared library for dynamic loading by HTTPd. Each supported platform
and architecture has its own artifact hosted on httpd-datadog’s repository.
To install the module:
Run the following script to download the latest version of the module:
curl -s https://api.github.com/repos/DataDog/httpd-datadog/releases/latest \
| grep "mod_datadog-linux-x86_64.tar.gz" \
| cut -d : -f 2,3 \
| tr -d \" \
| wget -qi -
When unpacking the tarball, the resulting file is mod_datadog.so, the shared library that must
be loaded by the server.
Place the file in the directory where HTTPd searches for modules, typically /usr/local/apache2/modules.
Load the module by adding the following line in the configuration file:
LoadModule datadog_module modules/mod_datadog.so
To enable the module, make sure to restart or reload HTTPd.
By default, all requests are traced and sent to the Datadog Agent.
To change the module default behavior, use Datadog* directives described in the Datadog module’s API documentation.
For example, the following configuration sets the service name to my-service and the sampling rate to 10%:
LoadModule datadog_module modules/mod_datadog.so
DatadogServiceName my-app
DatadogSamplingRate 0.1
Additional helpful documentation, links, and articles:
