[wildfly-dev] 2 instance cluster in master/slave

Richard Achmatowicz rachmato at redhat.com
Wed May 28 09:29:57 EDT 2014 

Hi Arun

It's a Linux command and applies to a Linux OS only. You need to do it 
via root in order to use it.
Disabling firewalls and configuring multicast communication is 
unfortunately OS dependent.
I'm not a Mac user, but from a quick Google, it looks as through it is 
disabled/enabled from System Preferences.
If Raspbian is based on Debian, then the iptables command may be 
similarly available from root.

If none of this works, then there is the option of further debugging 
with some JGroups tools, or simply configuring JGroups to use a 
TCP-based stack.

By the way, when you have started two nodes which you are expecting to 
connect, you should see group membership messages appearing in the 
console logs, near the end of the startup. You should see both hosts (IP 
addresses) listed in the group membership - that will confirm that 
JGroups communication is working correctly. If you only see one IP 
address on each machine, the messages are not getting through.


Richard

On 28/05/14 09:11 AM, Arun Gupta wrote:
> Richard,
>
> Is this a command or this entry needs to be commented in a file somewhere ?
>
> Does it matter if the master is on Mac and slave is on Raspbian ?
>
> Arun
>
> On Wed, May 28, 2014 at 6:00 AM, Richard Achmatowicz
> <rachmato at redhat.com> wrote:
>> Arun
>>
>> The usual suspect in such a problem (updates to sessions not getting
>> replicated between nodes) is JGroups not being able to send replication
>> messages from one host to another. For example, if you are using the default
>> udp stack of JGroups, you need to ensure that multicast communication is set
>> up correctly on the machines you are using. On Linux boxes, the default
>> firewall settings usually block multicast the JGroups messages from arriving
>> successfully. If you are working on Linux, you can disable the firewall
>> with:
>>
>> # iptables -F
>>
>> This will remove all firewall rules until the next reboot and allow the
>> JGroups multicast messages to get through. Give that a shot. Configuring the
>> JGroups transport is about the only additional configuration that is
>> required for clustering to work.
>>
>> Richard
>>
>>
>> On 28/05/14 04:39 AM, Kabir Khan wrote:
>>> On 28 May 2014, at 03:49, Arun Gupta <arun.gupta at gmail.com> wrote:
>>>
>>>> I think master/slave is now configured on two nodes, Domain Controller
>>>> shows the following message:
>>>>
>>>> [Host Controller] 16:34:18,888 INFO  [org.jboss.as.domain] (Host
>>>> Controller Service Threads - 32) JBAS010918: Registered remote slave
>>>> host "slave", WildFly 8.1.0.CR2 "Kenny"
>>>>
>>>> Deployed/enabled a simple app and assigned to other-server-group and
>>>> saw the log message:
>>>>
>>>> [Host Controller] 18:57:19,508 INFO  [org.jboss.as.repository] (XNIO-1
>>>> task-9) JBAS014900: Content added at location
>>>>
>>>> /Users/arungupta/tools/wildfly-8.1.0.CR2/domain/data/content/c4/f73f651f03c68d3a7b29686519e6142bccdfa4/content
>>>>
>>>> The app is now accessible on master and slave on :8330.
>>>>
>>>> By default, if an app is deployed to other-server-group on Domain
>>>> Controller, does it get deployed to all servers in that server-group ?
>>> Yes, and if you bring up more hosts with servers in that server group, or
>>> more servers in that group on an existing host, the app gets deployed to
>>> those as well.
>>>> If the two nodes are on the same host then session replication work.
>>>> This is the first time I've configured nodes on two different hosts
>>>> and can't get session replication to work. That is, session attributes
>>>> added to the application on one node (master) are not visible on the
>>>> other node (slave). What configuration am I missing ?
>>> I’m not so familiar with clustering so I am not sure. Richard?
>>>> Arun
>>>>
>>>> On Tue, May 27, 2014 at 5:02 PM, Arun Gupta <arun.gupta at gmail.com> wrote:
>>>>> On Tue, May 27, 2014 at 4:13 PM, Kabir Khan <kabir.khan at jboss.com>
>>>>> wrote:
>>>>>> On 27 May 2014, at 23:39, Arun Gupta <arun.gupta at gmail.com> wrote:
>>>>>>
>>>>>>> Trying to following the instructions at:
>>>>>>>
>>>>>>> https://docs.jboss.org/author/display/WFLY8/WildFly+8+Cluster+Howto
>>>>>>>
>>>>>>> This shows how to setup a 2-instance cluster in master/slave where
>>>>>>> master is on my laptop and slave is on a Raspi. Couple of questions
>>>>>>> ...
>>>>>>>
>>>>>>> 1). Why the following entry is still referring to 9999 ? Shouldn't it
>>>>>>> be 9990 ?
>>>>>>>
>>>>>>> <domain-controller>
>>>>>>>    <remote host="10.211.55.7" port="9999"/>
>>>>>>> </domain-controller>
>>>>>>>
>>>>>>> FTR it only works with 9999, not with 9990.
>>>>>>>
>>>>>>> Domain Controller shows the message:
>>>>>>>
>>>>>>> [Host Controller] 15:36:22,811 INFO  [org.jboss.as.domain] (Host
>>>>>>> Controller Service Threads - 28) JBAS010918: Registered remote slave
>>>>>>> host "slave", WildFly 8.1.0.CR2 “Kenny”
>>>>>> It looks like we hardcode the old “remote://“ protocol in
>>>>>> RemoteDomainConnectionService rather than the new http-remoting protocol, so
>>>>>> it is a bug. I am not sure if that is something we should attempt to
>>>>>> negotiate explicitly, or to make the <remote> element take a ‘protocol’
>>>>>> attribute?
>>>>>>>
>>>>> Filed https://issues.jboss.org/browse/WFLY-3410 for tracking.
>>>>>
>>>>>>> 2). Master is throwing the following exception:
>>>>>>>
>>>>>>> 22:15:25,094 INFO  [org.jboss.as.process.Server:server-one.status]
>>>>>>> (ProcessController-threads - 3) JBAS012017: Starting process
>>>>>>> 'Server:server-one'
>>>>>>> [Server:server-one] Error occurred during initialization of VM
>>>>>>> [Server:server-one] Server VM is only supported on ARMv7+ VFP
>>>>>> This ^^ seems to be the real error. Try removing “-server” in the
>>>>>> jvm-options.
>>>>> I removed -server from domain.sh, didn't realize its hardcoded in
>>>>> host.xml. It worked after commenting in host.xml. Is that a bug as
>>>>> well ?
>>>>>
>>>>> Arun
>>>>>
>>>>>>> 22:15:25,557 INFO  [org.jboss.as.process.Server:server-one.status]
>>>>>>> (reaper for Server:server-one) JBAS012010: Process 'Server:server-one'
>>>>>>> finished with an exit status of 1
>>>>>>> [Host Controller] 22:15:26,408 INFO  [org.jboss.as.host.controller]
>>>>>>> (ProcessControllerConnection-thread - 2) JBAS010926: Unregistering
>>>>>>> server server-one
>>>>>>> [Host Controller] 22:15:26,495 INFO  [org.jboss.as.host.controller]
>>>>>>> (Controller Boot Thread) JBAS010922: Starting server server-two
>>>>>>> 22:15:26,417 ERROR [org.jboss.as.process.Server:server-one.status]
>>>>>>> (ProcessController-threads - 3) JBAS012006: Failed to send data bytes
>>>>>>> to process 'Server:server-one' input stream: java.io.IOException:
>>>>>>> Stream closed
>>>>>>> at
>>>>>>> java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:434)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.OutputStream.write(OutputStream.java:116) [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.FilterOutputStream.flush(FilterOutputStream.java:140)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.flush(BaseNCodecOutputStream.java:125)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.flush(BaseNCodecOutputStream.java:137)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.Base64OutputStream.flush(Base64OutputStream.java:44)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.close(BaseNCodecOutputStream.java:154)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.Base64OutputStream.close(Base64OutputStream.java:44)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ManagedProcess.sendStdin(ManagedProcess.java:164)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ProcessController.sendStdin(ProcessController.java:207)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ProcessControllerServerHandler$InitMessageHandler$ConnectedMessageHandler.handleMessage(ProcessControllerServerHandler.java:140)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.protocol.ConnectionImpl.safeHandleMessage(ConnectionImpl.java:269)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.protocol.ConnectionImpl$1$1.run(ConnectionImpl.java:223)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_40]
>>>>>>> at org.jboss.threads.JBossThread.run(JBossThread.java:122)
>>>>>>> [jboss-threads-2.1.1.Final.jar:2.1.1.Final]
>>>>>>> 22:15:26,573 ERROR [org.jboss.as.protocol.connection]
>>>>>>> (ProcessController-threads - 3) JBAS016610: Failed to read a message:
>>>>>>> java.io.IOException: Stream closed
>>>>>>> at
>>>>>>> java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:434)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.OutputStream.write(OutputStream.java:116) [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.io.FilterOutputStream.flush(FilterOutputStream.java:140)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.flush(BaseNCodecOutputStream.java:125)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.flush(BaseNCodecOutputStream.java:137)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.Base64OutputStream.flush(Base64OutputStream.java:44)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.BaseNCodecOutputStream.close(BaseNCodecOutputStream.java:154)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.stdin.Base64OutputStream.close(Base64OutputStream.java:44)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ManagedProcess.sendStdin(ManagedProcess.java:164)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ProcessController.sendStdin(ProcessController.java:207)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.ProcessControllerServerHandler$InitMessageHandler$ConnectedMessageHandler.handleMessage(ProcessControllerServerHandler.java:140)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.protocol.ConnectionImpl.safeHandleMessage(ConnectionImpl.java:269)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> org.jboss.as.process.protocol.ConnectionImpl$1$1.run(ConnectionImpl.java:223)
>>>>>>> [wildfly-process-controller-8.1.0.CR2.jar:8.1.0.CR2]
>>>>>>> at
>>>>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at
>>>>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>>>>>>> [rt.jar:1.7.0_40]
>>>>>>> at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_40]
>>>>>>> at org.jboss.threads.JBossThread.run(JBossThread.java:122)
>>>>>>> [jboss-threads-2.1.1.Final.jar:2.1.1.Final]
>>>>>>>
>>>>>>> Same error for server-two as well.
>>>>>>>
>>>>>>> Trying to explicitly start server-three on slave gives the same error.
>>>>>>>
>>>>>>> This is all using 8.1 CR2.
>>>>>>>
>>>>>>> Any idea what might be wrong ?
>>>>>>>
>>>>>>> Thanks
>>>>>>> Aru
>>>>>>>
>>>>>>> --
>>>>>>> http://blog.arungupta.me
>>>>>>> http://twitter.com/arungupta
>>>>>>> _______________________________________________
>>>>>>> wildfly-dev mailing list
>>>>>>> wildfly-dev at lists.jboss.org
>>>>>>> https://lists.jboss.org/mailman/listinfo/wildfly-dev
>>>>>
>>>>>
>>>>> --
>>>>> http://blog.arungupta.me
>>>>> http://twitter.com/arungupta
>>>>
>>>>
>>>> --
>>>> http://blog.arungupta.me
>>>> http://twitter.com/arungupta
>>
>
>

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