<p>Trying to move from Flink 1.3.2 to 1.5 We have cluster deployed with kubernetes. Everything works fine with 1.3.2 but I can not submit job with 1.5. When I am trying to do that I just see spinner spin around infinitely, same via REST api. I even can't submit wordcount example job.
Seems my taskmanagers can not connect to jobmanager, I can see them in flink UI, but in logs I see</p>

<blockquote>
  <p>level=WARN   akka.remote.transport.netty.NettyTransport - Remote connection to [null] failed with
  org.apache.flink.shaded.akka.org.jboss.netty.channel.ConnectTimeoutException:
  connection timed out:
  flink-jobmanager-nonprod-2.rpds.svc.cluster.local/25.0.84.226:6123</p>
  
  <p>level=WARN   akka.remote.ReliableDeliverySupervisor - Association with remote system
  [akka.tcp://flink@flink-jobmanager-nonprod-2.rpds.svc.cluster.local:6123]
  has failed, address is now gated for [50] ms. Reason: [Association
  failed with
  [akka.tcp://flink@flink-jobmanager-nonprod-2.rpds.svc.cluster.local:6123]]
  Caused by: [No response from remote for outbound association.
  Associate timed out after [20000 ms].]</p>
  
  <p>level=WARN   akka.remote.transport.netty.NettyTransport - Remote
  connection to [null] failed with
  org.apache.flink.shaded.akka.org.jboss.netty.channel.ConnectTimeoutException:
  connection timed out:
  flink-jobmanager-nonprod-2.rpds.svc.cluster.local/25.0.84.226:6123</p>
</blockquote>

<p>But I can do telnet from taskmanager to jobmanager </p>

<p>Moreover everything works on my local if I start flink in cluster mode (jobmanager + taskmanager). 
In 1.5 documentation I found <strong>mode</strong> option which flip mode between flip6 and legacy (default flip6), but If I set mode: legacy I don't see my taskmanagers registered at all.</p>

<p>Is this something specific about k8s deployment and 1.5 I need to do? I checked 1.5 k8s config and it looks pretty same as we have, but we using customized docker image for flink (Security, HA, checkpointing)</p>

<p>Thank you.</p>

Georgy Gobozov
<p>The issue with jobmanage connectivity. Jobmanager docker image cannot connect to "flink-jobmanager" (${JOB_MANAGER_RPC_ADDRESS}) address.</p>

<p><strong>Just use afilichkin/flink-k8s Docker instead of flink:latest</strong></p>

<p>I've fixed it by adding new host to jobmanager docker. You can see it in my github project</p>

<p><a href="https://github.com/Aleksandr-Filichkin/flink-k8s/tree/master" rel="nofollow noreferrer">https://github.com/Aleksandr-Filichkin/flink-k8s/tree/master</a></p>
