Hello All, 

We have a akka application running in production in a non clustered mode ( 
doesn't akka clustering ). 
We are trying to dockerize this application and running into an issue. We 
are using docker host networking and for various other reasons we are not 
yet ready to use other types of networking.

Application binds to 0.0.0.0 interface on port 9080 and does a simple http 
healthcheck on itself. 
This healthcheck is failing because we are seeing a connection reset error. 
We are seeing this only inside docker container.

During startup time application gets bound to 0:0:0:0:0:0:0:0:9080. 
2018-04-13T08:29:54.921-0700 [INFO ] - Bound to /0:0:0:0:0:0:0:0:9080

Any help is appreciated. 

akka logs:
2018-04-13T08:34:25.311-0700 [DEBUG] akka.io.TcpListener            [15:34:
25.311UTC] - New connection accepted
2018-04-13T08:34:25.312-0700 [DEBUG] akka.io.SelectionHandler       [15:34:
25.312UTC] - now supervising Actor[akka:
//appname/system/IO-TCP/selectors/$d/12#394551476]
2018-04-13T08:34:25.312-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
25.312UTC] - started (akka.io.TcpIncomingConnection@1dafecc7)
2018-04-13T08:34:25.312-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
25.312UTC] - now watched by Actor[akka:
//appname/system/IO-TCP/selectors/$d#992175932]
2018-04-13T08:34:25.312-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
25.312UTC] - now watched by Actor[akka:
//appname/user/IO-HTTP/listener-0/88#-1187840999]
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.SelectionHandler       [15:34:
25.313UTC] - now supervising Actor[akka:
//appname/system/IO-TCP/selectors/$h/11#789402148]
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
25.313UTC] - started (akka.io.TcpOutgoingConnection@62c77639)
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
25.313UTC] - now watched by Actor[akka:
//appname/system/IO-TCP/selectors/$h#227381172]
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
25.313UTC] - Attempting connection to [/0.0.0.0:9080]
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.TcpListener            [15:34:
25.313UTC] - New connection accepted
2018-04-13T08:34:25.313-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
25.313UTC] - Connection established to [/0.0.0.0:9080]
2018-04-13T08:34:25.314-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
25.314UTC] - now watched by Actor[akka:
//appname/user/IO-HTTP/group-0/52#1518564728]
2018-04-13T08:34:25.314-0700 [DEBUG] akka.io.SelectionHandler       [15:34:
25.314UTC] - now supervising Actor[akka:
//appname/system/IO-TCP/selectors/$h/12#1641348988]
2018-04-13T08:34:25.314-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
25.314UTC] - started (akka.io.TcpIncomingConnection@65bac45)
2018-04-13T08:34:25.314-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
25.314UTC] - now watched by Actor[akka:
//appname/system/IO-TCP/selectors/$h#227381172]
2018-04-13T08:34:26.327-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
26.327UTC] - now watched by Actor[akka:
//appname/user/IO-HTTP/listener-0/89#-1079090421]
2018-04-13T08:34:26.327-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
26.327UTC] - stopped
2018-04-13T08:34:26.327-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
26.327UTC] - Closing connection due to IO error java.io.IOException: 
Connection reset by peer
2018-04-13T08:34:26.327-0700 [DEBUG] akka.io.TcpOutgoingConnection  [15:34:
26.327UTC] - stopped
2018-04-13T08:34:26.328-0700 [DEBUG] akka.io.TcpIncomingConnection  [15:34:
26.328UTC] - stopped




Spray logs:
2018-04-13T08:35:39.168-0700 - Dispatching GET request to 
http://10.4.4.178:9080/admin/health 
to handler Actor[akka://appname/system/IO-TCP/selectors/$b/20#-595408603]
2018-04-13T08:35:45.296-0700 - Dispatching GET request to 
http://10.4.4.178:9080/admin/health 
to handler Actor[akka://appname/system/IO-TCP/selectors/$d/19#721242322]
2018-04-13T08:35:51.372-0700 - Dispatching GET request to 
http://10.4.4.178:9080/admin/health 
to handler Actor[akka://appname/system/IO-TCP/selectors/$c/16#1510321611]
2018-04-13T08:35:57.436-0700 - Dispatching GET request to 
http://10.4.4.178:9080/admin/health 
to handler Actor[akka://appname/system/IO-TCP/selectors/$g/22#1994752981]
2018-04-13T08:36:03.622-0700 - Dispatching GET request to 
http://10.4.4.178:9080/admin/health 
to handler Actor[akka://appname/system/IO-TCP/selectors/$f/20#-1450294853]




Healthcheck logs:
2018-04-13T08:32:53.356-0700 [INFO ] - [BEGIN] Health check
2018-04-13T08:32:53.356-0700 [DEBUG] - Memory    : SUCCESS
2018-04-13T08:32:54.378-0700 [DEBUG] - HTTP      : FAILURE, spray.can.
Http$ConnectionException: ErrorClosed(Connection reset by peer)
2018-04-13T08:32:54.378-0700 [ERROR] - spray.can.Http$ConnectionException: 
ErrorClosed(Connection reset by peer)
 at spray.can.client.HttpHostConnectionSlot.reportDisconnection(
HttpHostConnectionSlot.scala:228)
 at spray.can.client.HttpHostConnectionSlot$$anonfun$connected$1.applyOrElse
(HttpHostConnectionSlot.scala:161)
 at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
 at spray.can.client.HttpHostConnectionSlot.aroundReceive(
HttpHostConnectionSlot.scala:33)
 at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
 at akka.actor.ActorCell.invoke_aroundBody0(ActorCell.scala:487)
 at akka.actor.ActorCell$AjcClosure1.run(ActorCell.scala:1)
 at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149
)
 at akka.instrumentation.ActorCellInstrumentation.aroundBehaviourInvoke(
ActorCellInstrumentation.scala:66)
 at akka.actor.ActorCell.invoke(ActorCell.scala:483)
 at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
 at akka.dispatch.Mailbox.run(Mailbox.scala:220)
 at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(
AbstractDispatcher.scala:393)
 at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
 at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.
java:1339)
 at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
 at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.
java:107)

2018-04-13T08:32:54.378-0700 [INFO ] - [END  ] Status: Failed (1022 ms)



Versions: 
akka - 2.3.0
spray - 1.3.2
running on alpine linux inside a docker container. 

Any pointers would help. Thanks in advance.

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