Bug 822218

Summary:	Investigate dropping -Djava.net.preferIPv4Stack=true from agent options
Product:	[Other] RHQ Project	Reporter:	Heiko W. Rupp <hrupp>
Component:	Agent	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	4.4	CC:	hrupp
Target Milestone:	---
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	809125, 919199

Description Heiko W. Rupp 2012-05-16 16:26:38 UTC

We should investigate dropping that flag - how will connections to jmx servers and the agent/server communication work?

This flag prevents simultaneous usage of IPv6 and IPv4 :

See Bug 809721 and Bug 809125

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from rhq-devel:

Interestingly enough, this bug itself may have been solved, but we may be running into a different one:

the -Djava.net.preferIPv4Stack=true property now looks like the bad guy:

snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04-415-11M3635)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01-415, mixed mode)
snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ echo $RHQ_AGENT_JAVA_OPTS 
-Xmx320m -agentlib:jdwp=transport=dt_socket,address=8788,server=y,suspend=n
snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ bin/standalone.sh 
Listening for transport dt_socket at address: 8788

Starting the plugin container.
Loading plugins
...Loaded plugin: JBossAS7
...Loaded plugin: JMX
...Loaded plugin: Platforms

Ready.
[0]:0 > disc s
Discovery took: 1021ms
[Resource[id=-3, uuid=a7d94d2d-944d-4c12-881a-73bef576a3c7, type={JBossAS7}JBossAS7 Standalone Server, key=/devel/jboss-eap-6.0/standalone, name=EAP (::1:9990), parent=snert, version=EAP 6.0.0.Beta2]]
[1]:0 > avail -3
EAP (::1:9990)( -3 ):UP
[2]:0 > quit
Terminating ..
Shutting down ...
snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ export RHQ_AGENT_JAVA_OPTS="$RHQ_AGENT_JAVA_OPTS -Djava.net.preferIPv4Stack=true"
snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ echo $RHQ_AGENT_JAVA_OPTS -Xmx320m -agentlib:jdwp=transport=dt_socket,address=8788,server=y,suspend=n -Djava.net.preferIPv4Stack=true
snert:/im/rhq/modules/enterprise/agent/target/rhq-agent hrupp$ bin/standalone.sh Listening for transport dt_socket at address: 8788

Starting the plugin container.
Loading plugins
dis...Loaded plugin: JBossAS7
...Loaded plugin: JMX
...Loaded plugin: Platforms

Ready.
[0]:0 >  disc s
Discovery took: 1172ms
[Resource[id=-3, uuid=5a2f33c7-62a3-434a-95cc-c24aa319725f, type={JBossAS7}JBossAS7 Standalone Server, key=/devel/jboss-eap-6.0/standalone, name=EAP (::1:9990), parent=snert, version=EAP 6.0]]
[1]:0 > avail -3
EAP (::1:9990)( -3 ):DOWN