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Attempting to use ${HOSTNAME} in a config file does not work! According to the documentation, config files should resolve environment variables as mentioned in the docs:
substitutions fall back to environment variables if they don't resolve in the config itself, so ${HOME} would work as you expect. Also, most configs have system properties merged in so you could use ${user.home}.
Is there a way to get hostname into the config file?
Reproduction
Add host.name=${HOSTNAME} to an application.conf file, then try and access it from anywhere. For example try adding
Logger.info(s"Hostname is ${current.configuration.getString("host.name").getOrElse("NOT-FOUND")}")
to the Global.scala.
Environment
This was run on a RHEL6 environment where echo $HOSTNAME produces precise32 so the environment variable exists, this is not the program hostname.
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Typesafe Config allows you to store configuration into separated files and use include keyword to include configuration of those files.
Configurations from a file By default, the ConfigFactory looks for a configuration file called application. conf. If willing to use a different configuration file (e.g.: another. conf), we just need to indicate a different file name and path to load (e.g.: ConfigFactory.
class ConfigFactory The configuration object factory instantiates a Config object for each configuration object name that is accessed and returns it to callers. Each configuration object gets a storage object injected, which is used for reading and writing the configuration data.
The solution seems to be passing in the hostname via a system property as -Dhost.name=$HOSTNAME or -Dhost.name=$(hostname). I'd imagine in windows it would be something else, but this works for *NIX environments.
Unless anyone can come up with something cleaner this will be the accepted answer.
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