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https://issues.apache.org/jira/browse/KARAF-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180243#comment-13180243
]
metatech commented on KARAF-1138:
---------------------------------
KARAF-1129 is about exposing the RMI registry on a chosen network interface.
KARAF-1138 is related, but complementary :
The RMI registry acts as a "UDDI" and allows clients to send lookup requests
for services and find their related IP and ports.
The RMI registry implementation has a too simplistic logic : a lookup response
can contain "localhost" instead of a real hostname.
> Hostname should be explicitly configured for RMI/JMX connections to work
> remotely with DHCP addresses
> -----------------------------------------------------------------------------------------------------
>
> Key: KARAF-1138
> URL: https://issues.apache.org/jira/browse/KARAF-1138
> Project: Karaf
> Issue Type: Improvement
> Environment: ServiceMix 4.3
> Reporter: metatech
> Priority: Minor
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> JVM RMI logic to auto-guess its own IP address does not work well with
> default hostname settings (IP obtained via DHCP, but defined in /etc/hosts as
> "localhost") on Linux. When trying to call JMX remotely from a different
> machine, the caller receives "127.0.0.1" as server address, with the error
> below.
> A workaround is to define the system property "java.rmi.server.hostname" to
> the real hostname.
> This can be easily automated by adding in the script bin/karaf the following
> lines :
> {code}
> IP_LOOKUP=`getent hosts \`hostname\` | wc -l`
> if [ $IP_LOOKUP -eq 0 ]; then
> JAVA_OPTS="$JAVA_OPTS -Djava.rmi.server.hostname=`hostname`"
> fi
> {code}
> Another solution is to define manually the property in
> $KARAF_HOME/etc/system.properties.
> A third possibility is to extend the hinted solution in
> ActiveMQCommandSupport.java
> {code}
> smx@root> activemq:list --jmxurl
> service:jmx:rmi:///jndi/rmi://172.16.159.1:1099/karaf-root --jmxuser smx
> --jmxpassword smx
> ERROR: java.lang.RuntimeException: Failed to execute list task. Reason:
> java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested
> exception is:
> java.net.ConnectException: Connection refused
> java.lang.RuntimeException: Failed to execute list task. Reason:
> java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested
> exception is:
> java.net.ConnectException: Connection refused
> at
> org.apache.activemq.console.command.ListCommand.runTask(ListCommand.java:53)
> at
> org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
> at
> org.apache.activemq.console.command.AbstractJmxCommand.execute(AbstractJmxCommand.java:316)
> at
> org.apache.activemq.karaf.commands.ActiveMQCommandSupport.doExecute(ActiveMQCommandSupport.java:46)
> at
> org.apache.karaf.shell.console.OsgiCommandSupport.execute(OsgiCommandSupport.java:38)
> at
> org.apache.felix.gogo.commands.basic.AbstractCommand.execute(AbstractCommand.java:35)
> at
> org.apache.felix.gogo.runtime.shell.CommandProxy.execute(CommandProxy.java:50)
> at org.apache.felix.gogo.runtime.shell.Closure.execute(Closure.java:229)
> at
> org.apache.felix.gogo.runtime.shell.Closure.executeStatement(Closure.java:162)
> at org.apache.felix.gogo.runtime.shell.Pipe.run(Pipe.java:101)
> at org.apache.felix.gogo.runtime.shell.Closure.execute(Closure.java:79)
> at
> org.apache.felix.gogo.runtime.shell.CommandSessionImpl.execute(CommandSessionImpl.java:71)
> at org.apache.karaf.shell.console.jline.Console.run(Console.java:170)
> at java.lang.Thread.run(Thread.java:662)
> Could not connect to JMX server. This command requires that the remote JMX
> server be enabled.
> This is typically done by adding the following JVM arguments:
> -Dcom.sun.management.jmxremote.port=1099
> -Dcom.sun.management.jmxremote.authenticate=false
> -Dcom.sun.management.jmxremote.ssl=false
> The connection error was: java.net.ConnectException: Connection refused
> {code}
> http://forum.springsource.org/showthread.php?64670-Why-do-I-need-to-define-java-rmi-server-hostname&s=cd088bea049ead95d2cb3ff186babaef&p=219304#post219304
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