Micronaut configure logger appenders based of the enviroment

Question

I would like to configure logging appender based on the environment, for example while running in production I would like to configure an appender that would send log to elasticsearch but while on test or development mode this appender would not be enabled.

Answer 1

You can override the default logback config file by using logback.configurationFile system variable.

java -Dlogback.configurationFile=logback-prod.xml -jar your.jar

But, if what you need is the ability to use an env variable you can do this without to use a third-party library:

1. Override the logback system variable inside the main micronaut class before call main, like following

    @Singleton
    public class MyMicronautApplication  {
   
        public static void main(String[] args) {
            var env = System.getenv("MICRONAUT_ENVIRONMENTS");
   
            if (env != null && !env.isEmpty()) {
                System.setProperty(ContextInitializer.CONFIG_FILE_PROPERTY, "logback-" + env + ".xml");
            }
   
            Micronaut.run(MyMicronautApplication.class);
   
        }
    }
   

2. create you custom env based logback config file like: logback-dev.xml and put in resources dir.

3. then set env var MICRONAUT_ENVIRONMENTS=dev according to your deployment logic.

4. enjoy using logback-dev.xml, logback-prod.xml, logback-stagging.xml, etc