# Create a Configuration File

You can optionally create a configuration file to hold Central Administration server options, and pass this file to the server at startup.

The properties that can be specified in the configuration file correspond to the startup options, and are described in Central Administration Server Options.

The configuration file takes the form of a typical Java properties file and must use the `.properties` file extension. In a text-based file, specify one property on each line, using the format:

    property=value

For example:

    com.tibco.emsca.data.dir=/emsca_data
    com.tibco.emsca.http.hostport=*:8080
    com.tibco.emsca.jaas=/emsca_security/emsca.jaas

By default, the Central Administration server looks for a file named

    emsca.properties

in the current directory. However, you can direct the server to a different file using the `--config` command line option.
Note: If an argument is passed to the Central Administration executable that is also configured in the file, the value provided in the command line overrides the value in the configuration file.
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