We are still getting these errors on the external clients even when
useTopologyForLoadBalancing is disabled and using
(tcp://external-cluster-dns-1:61616,tcp://external-cluster-dns-2:61616)
org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnector: AMQ214033:
Cannot resolve host
java.net.UnknownHostException: internal-cluster-dns-1
The error is show 2 times every time the external consumer is started. The
connection works until we power down cluster-dns-1 machine. Then the consumer
just stops receiving messages and never reconnects to cluster-dns-2 node.
When using the same consumer internally everything works as expected.
--
Vilius
-----Original Message-----
From: Domenico Francesco Bruscino <[email protected]>
Sent: Tuesday, January 4, 2022 8:02 PM
To: [email protected]
Subject: Re: Artemis cluster topology and external clients
Hi Vilius,
the clients should disable topology for load balancing and use static
connectors, i.e.
(tcp://external-cluster-dns-1:61616,tcp://external-cluster-dns-2:61616)?ha=true&reconnectAttempts=30&useTopologyForLoadBalancing=false
Regards,
Domenico
On Mon, 3 Jan 2022 at 10:00, Vilius Šumskas <[email protected]>
wrote:
> Hello list,
>
> we are trying to use Artemis HA shared storage cluster which our SaaS
> application. In addition to consumers/producers internal to SaaS
> application itself, we also have thousands of external
> consumers/producers which are installed on client’s premises .
>
> As broadcast is not possible on Google Cloud we are using static
> discovery configuration with these connectors:
>
> <connectors>
> <!-- Connector used to be announced through cluster
> connections and notifications -->
> <connector
> name="artemis-master">tcp://internal-cluster-dns-1:61616</connector>
> <connector
> name="artemis-slave">tcp://internal-cluster-dns2:61616</connector>
> </connectors>
>
> Our acceptors are also configured to use internal DNS of the hosts on
> both cluster nodes:
>
> <acceptor
> name="artemis">tcp://internal-cluster-dns-1:61616?tcpSendBufferSize=10
> 48576;tcpReceiveBufferSize=1048576;amqpMinLargeMessageSize=102400;prot
> ocols=CORE,AMQP,STOMP,HORNETQ,MQTT,OPENWIRE;useEpoll=true;amqpCredits=
> 10
>
> 00;amqpLowCredits=300;amqpDuplicateDetection=true;supportAdvisory=fals
> e;suppressInternalManagementObjects=false</acceptor>
>
> We don’t have issues with internal consumers/producers, however when
> we try to connect external consumers (via external IP), they are
> trying to connect via internal DNS which is probably set in the
> cluster topology packet.
>
> This is probably expected and by design, but my question is how do we
> correctly handle such case? We obviously do not want internal clients
> to be served via external IP because external traffic is expensive in
> the cloud and the performance would decrease dramatically. Even with
> static discovery we would like to have a possibility to expand our
> cluster in the future, i.e. use the topology so that clients are configured
> automatically.
>
> Do we need to have a split-DNS server so that external and internal
> clients will see different IP addresses? Or maybe it is possible to
> have the same node serving different acceptors on different ports and
> different DNS names?
>
> Any pointers are much appreciated.
>
> --
> Best Regards,
>
> Vilius Šumskas
> Advantes technologies
> IT manager
> +370 614 75713
>
>
