As an alternative to using system properties or controller-info.xml to configure the application name, tier name, and so on, you can configure the agent based on environment variables. Environment variables give you another mechanism for configuring the agent based on dynamically set values.
About Environment Variables
To configure the agent with environment variables, simply set the value of the appropriate environment variable in the environment in which the monitored application runs.
There are environment variables defined most of the agent settings you can configure in the controller-info.xml file. For example, there are variables for the application name, node name, Controller connection settings, and more.
For example, to set the node name for the agent using an environment variable, use the APPDYNAMICS_AGENT_NODE_NAME variable. The following command sets the variable to node23. When the agent subsequently starts up, it automatically takes node23 as its node name:
Since an agent setting can be specified in several places, the agent applies the following order of priority in taking a value for the setting:
- Environment variable
- System property
For each setting, the agent checks each of these sources. For the value, the agent uses the value from the first source that contains a non-empty value (based on the order shown).
Environment Variables Used by the Agent
The Java Agent takes configuration settings from the following environment variables, when set:
|Environment Variable||Equivalent property|
|APPDYNAMICS_AGENT_UNIQUE_HOST_ID_ENV_VAR||Unique host name|
Note that there are additional agent properties that are not configurable through environment variables. The list above comprises the complete set of environment variables used by the Java Agent.