Hi all,
I have written a Scala web application using Akka+Spray, and am now trying
to run it inside a Docker container - but am really struggling to get it to
work.
It looks like the problem is that Akka messages are not being delivered. I
have read some info about needing to set akka.remote.netty.tcp.bind-hostname
and akka.remote.netty.tcp.bind-port settings IF using remote actors,
however I am not using remote actors... at the moment I just have a
standalone actor system inside a single docker container. So I have not set
these properties.
The logs and errors that I'm seeing are:
2015-05-19 16:01:18 INFO
[myservice-akka.actor.default-dispatcher-6:a.e.s.Slf4jLogger$$anonfun$receive$1$$anonfun$applyOrElse$3@74]
- Message [akka.dispatch.sysmsg.DeathWatchNotification] from
Actor[akka://myservice/user/IO-HTTP/listener-0#-697002067] to
Actor[akka://myservice/user/IO-HTTP/listener-0#-697002067] was not
delivered. [1] dead letters encountered. This logging can be turned off or
adjusted with configuration settings 'akka.log-dead-letters' and
'akka.log-dead-letters-during-shutdown'.
2015-05-19 16:01:18 ERROR
[myservice-akka.actor.default-dispatcher-4:a.e.s.Slf4jLogger$$anonfun$receive$1$$anonfun$applyOrElse$1@66]
- Error during selector management task:
[java.nio.channels.ClosedChannelException]
java.nio.channels.ClosedChannelException: null
at
java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:194)
~[na:1.7.0_75]
at
akka.io.SelectionHandler$ChannelRegistryImpl$$anon$4.tryRun(SelectionHandler.scala:157)
~[akka-actor_2.11-2.3.9.jar:na]
at
akka.io.SelectionHandler$ChannelRegistryImpl$Task.run(SelectionHandler.scala:215)
~[akka-actor_2.11-2.3.9.jar:na]
I think this exception is caused when I try to bind to a port for HTTP:
IO(Http) ! Http.Bind(service, interface = "0.0.0.0", port = 8080)
I have exposed port 8080 and ran the container with a port mapping, -p
8080:8080 ... and I have also tried using different a different port than 8080,
so I don't think the problem is related to the binding itself, but rather I
think perhaps the Akka message is not being delivered.
Does anyone have any idea what the problem might be? Have been trying to get
this to work all day!
Thanks for any help,
Josh
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