How to pass Ip/Port info of all runing services to the Akka node dynamically.

[Nitin Jadon]

We are running Akka with Docker image and want to pass all the running Akka Docker's IP/Port info in case of addition on new Docker image.

our application.conf file is defined as per below

 

akka
 {


 actor
  {
    provider = "akka.cluster.ClusterActorRefProvider"
 
 debug {
              receive = on
              autoreceive = on
              lifecycle = on
              fsm = on
              event-stream = on
              unhandled = on
              router-misconfiguration = on
            }
  }
 
  remote
  {
    log-remote-lifecycle-events = off
    netty.tcp {
      hostname = "127.0.0.1"
      port = 2551
    }
  }
}

 

We have defined our Java code where we are loading config file using 

 

ActorSystem system = ActorSystem.create("ClusterSystem", config);

 

 

As per current configuration, we are listening to TCP Port. please help to figure out how to pass new docker image IP/Port information to all the current running docker images.  

 

[Akka Team]

The typesafe config library allows you to override config settings by setting the corresponding system property when you start the JVM, so something like "java my.App -Dakka.remote.netty.tcp.hostname=example.com -cp myjar.jar" but you can also use environment variables if defined in the config. 

See the typesafe config library docs for more info: https://github.com/typesafehub/config#uses-of-substitutions

Note that you will likely have to define the internal ip and port separately from the public ip and port as described here for it to work in Docker: http://doc.akka.io/docs/akka/2.4.14/scala/remoting.html#Remote_Configuration

--

Johan Andrén 

Akka Team

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