4:30 p.m.
There is some confusion about setting the WildFly node name (at least in the standalone
server case).
<tl;dr>
QUESTION: How does one change the server's cluster node name (say, for the JGroups
configuration). I thought both would be equivalent (either setting <server
name="a"> or setting -Djboss.node.name=a) but that does not seem to be the
case.
</tl;dr>
Suppose I start WildFly via standalone.sh (with its stock out of box standalone.xml) but
with the command line option:
-Djboss.node.name=wotgorilla
When I do this, I see the node-name (in the server-environment subsystem) set to
"wotgorilla" but the server's name is my normal hostname (in this case
"mazztower"):
/core-service=server-environment/:read-attribute(name=node-name)
{
"outcome" => "success",
"result" => "wotgorilla"
}
/:read-attribute(name=name)
{
"outcome" => "success",
"result" => "mazztower"
}
OK, but now suppose I edit standalone.xml - in the top-level root element <server> I
add the name attribute:
<server name="foobar">
and I start the server WITHOUT any commmand line options (just "standalone.sh").
I see that BOTH "name" and "node-name" match my new server name:
/core-service=server-environment/:read-attribute(name=node-name)
{
"outcome" => "success",
"result" => "foobar"
}
/:read-attribute(name=name)
{
"outcome" => "success",
"result" => "foobar"
}
QUESTION: Why the discrepency? Is this a bug or expected behavior? How does one change the
server's cluster node name (say, for the JGroups configuration). I thought both would
be equivalent (either setting <server name="a"> or setting
jboss.node.name) but that does not seem to be the case.
Thanks,
John Mazz
4:43 p.m.
Dear John,
Suppose you have two JBoss instances running on one (the same) host (using
e.g. port offset) identifying both would be done by explicitly setting the
jboss.node.name so this is expected behavior. Otherwise there would be a
conflict. (In our development stage we have over 30 JBoss servers running
on the same host, all being tied up to JGroups).
Regards Dennis
On Tue, Jun 28, 2016 at 11:30 PM, John Mazzitelli <mazz(a)redhat.com> wrote:
There is some confusion about setting the WildFly node name (at least
in
the standalone server case).
<tl;dr>
QUESTION: How does one change the server's cluster node name (say, for
the JGroups configuration). I thought both would be equivalent (either
setting <server name="a"> or setting -Djboss.node.name=a) but that does
not seem to be the case.
</tl;dr>
Suppose I start WildFly via standalone.sh (with its stock out of box
standalone.xml) but with the command line option:
-Djboss.node.name=wotgorilla
When I do this, I see the node-name (in the server-environment subsystem)
set to "wotgorilla" but the server's name is my normal hostname (in this
case "mazztower"):
/core-service=server-environment/:read-attribute(name=node-name)
{
"outcome" => "success",
"result" => "wotgorilla"
}
/:read-attribute(name=name)
{
"outcome" => "success",
"result" => "mazztower"
}
OK, but now suppose I edit standalone.xml - in the top-level root element
<server> I add the name attribute:
<server name="foobar">
and I start the server WITHOUT any commmand line options (just
"standalone.sh"). I see that BOTH "name" and "node-name"
match my new
server name:
/core-service=server-environment/:read-attribute(name=node-name)
{
"outcome" => "success",
"result" => "foobar"
}
/:read-attribute(name=name)
{
"outcome" => "success",
"result" => "foobar"
}
QUESTION: Why the discrepency? Is this a bug or expected behavior? How
does one change the server's cluster node name (say, for the JGroups
configuration). I thought both would be equivalent (either setting <server
name="a"> or setting jboss.node.name) but that does not seem to be the
case.
Thanks,
John Mazz
_______________________________________________
wildfly-dev mailing list
wildfly-dev(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/wildfly-dev
--
Best regards,
*Dennis Brouwer*
Extraordinary Goalkeeper
ZEEF - Kizitos B.V.
Amstelboulevard 184
1096 HM Amsterdam
www.ZEEF.com <http://www.zeef.com/>
US: +1 (415) 992-9409
NL: +31 (085) 888-3186
4:56 p.m.
Dear John,
Suppose you have two JBoss instances running on one (the same) host (using
e.g. port offset) identifying both would be done by explicitly setting the
jboss.node.name so this is expected behavior. Otherwise there would be a
conflict. (In our development stage we have over 30 JBoss servers running
on the same host, all being tied up to JGroups).
In that case, both of your servers would have identical "name" values (your
hostname). That seems "odd" in that the name for multiple servers are the same -
so their "name"s are not unique - but perhaps that is why WF 10 introduced the
UUID attribute?
Still, not sure why the discrepancy between jboss.node.name and <server name> - you
would think they both would behave the same, but do not.
Regards Dennis
On Tue, Jun 28, 2016 at 11:30 PM, John Mazzitelli <mazz(a)redhat.com> wrote:
> There is some confusion about setting the WildFly node name (at least in
> the standalone server case).
>
> <tl;dr>
> QUESTION: How does one change the server's cluster node name (say, for
> the JGroups configuration). I thought both would be equivalent (either
> setting <server name="a"> or setting -Djboss.node.name=a) but that
does
> not seem to be the case.
> </tl;dr>
>
> Suppose I start WildFly via standalone.sh (with its stock out of box
> standalone.xml) but with the command line option:
>
> -Djboss.node.name=wotgorilla
>
> When I do this, I see the node-name (in the server-environment subsystem)
> set to "wotgorilla" but the server's name is my normal hostname (in
this
> case "mazztower"):
>
> /core-service=server-environment/:read-attribute(name=node-name)
> {
> "outcome" => "success",
> "result" => "wotgorilla"
> }
>
> /:read-attribute(name=name)
> {
> "outcome" => "success",
> "result" => "mazztower"
> }
>
> OK, but now suppose I edit standalone.xml - in the top-level root element
> <server> I add the name attribute:
>
> <server name="foobar">
>
> and I start the server WITHOUT any commmand line options (just
> "standalone.sh"). I see that BOTH "name" and
"node-name" match my new
> server name:
>
> /core-service=server-environment/:read-attribute(name=node-name)
> {
> "outcome" => "success",
> "result" => "foobar"
> }
>
> /:read-attribute(name=name)
> {
> "outcome" => "success",
> "result" => "foobar"
> }
>
> QUESTION: Why the discrepency? Is this a bug or expected behavior? How
> does one change the server's cluster node name (say, for the JGroups
> configuration). I thought both would be equivalent (either setting <server
> name="a"> or setting jboss.node.name) but that does not seem to be the
> case.
>
> Thanks,
> John Mazz
> _______________________________________________
> wildfly-dev mailing list
> wildfly-dev(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/wildfly-dev
>
--
Best regards,
*Dennis Brouwer*
Extraordinary Goalkeeper
ZEEF - Kizitos B.V.
Amstelboulevard 184
1096 HM Amsterdam
www.ZEEF.com <http://www.zeef.com/>
US: +1 (415) 992-9409
NL: +31 (085) 888-3186
9:22 a.m.
The node name concept configured via -Djboss.node.name is a clustering concept not a
general managment one. You can set the node name by setting the server name, so that’s the
way to do it. Don’t try the other way around.
The server name can also be set via system property for standalone servers:
-Djboss.server.name
So there is no need to edit xml.
In a managed domain if a server process doesn’t have jboss.node.name set, the node name
will be <hc_name>:<server_name>. It needs to be a tuple like that as only that
tuple is required to be unique in a domain. Node name needs to be unique across a
cluster.
The discrepancy is because the jboss.node.name property is only used for some clustering
stuff and has never been part of AS 7+’s algorithm for establishing the server’s name for
management purposes. IIRC it was added to AS7 account for some use case previously not
handled in domain mode — but now handled better — or perhaps it was added in to be more
like AS < 7 where that property was long used in clustering. Probably both.
I don’t think the jboss.node.name property is even needed any more. But, we’re not going
to drop support of jboss.node.name as that may break some people. And I don’t think we’ll
add jboss.node.name to the algorithm for setting the server name, as that may break people
as well.
--
Brian Stansberry
Manager, Senior Principal Software Engineer
JBoss by Red Hat
On Jun 28, 2016, at 4:56 PM, John Mazzitelli <mazz(a)redhat.com>
wrote:
> Dear John,
>
> Suppose you have two JBoss instances running on one (the same) host (using
> e.g. port offset) identifying both would be done by explicitly setting the
> jboss.node.name so this is expected behavior. Otherwise there would be a
> conflict. (In our development stage we have over 30 JBoss servers running
> on the same host, all being tied up to JGroups).
In that case, both of your servers would have identical "name" values (your
hostname). That seems "odd" in that the name for multiple servers are the same -
so their "name"s are not unique - but perhaps that is why WF 10 introduced the
UUID attribute?
Still, not sure why the discrepancy between jboss.node.name and <server name> - you
would think they both would behave the same, but do not.
>
> Regards Dennis
>
> On Tue, Jun 28, 2016 at 11:30 PM, John Mazzitelli <mazz(a)redhat.com> wrote:
>
>> There is some confusion about setting the WildFly node name (at least in
>> the standalone server case).
>>
>> <tl;dr>
>> QUESTION: How does one change the server's cluster node name (say, for
>> the JGroups configuration). I thought both would be equivalent (either
>> setting <server name="a"> or setting -Djboss.node.name=a) but
that does
>> not seem to be the case.
>> </tl;dr>
>>
>> Suppose I start WildFly via standalone.sh (with its stock out of box
>> standalone.xml) but with the command line option:
>>
>> -Djboss.node.name=wotgorilla
>>
>> When I do this, I see the node-name (in the server-environment subsystem)
>> set to "wotgorilla" but the server's name is my normal hostname (in
this
>> case "mazztower"):
>>
>> /core-service=server-environment/:read-attribute(name=node-name)
>> {
>> "outcome" => "success",
>> "result" => "wotgorilla"
>> }
>>
>> /:read-attribute(name=name)
>> {
>> "outcome" => "success",
>> "result" => "mazztower"
>> }
>>
>> OK, but now suppose I edit standalone.xml - in the top-level root element
>> <server> I add the name attribute:
>>
>> <server name="foobar">
>>
>> and I start the server WITHOUT any commmand line options (just
>> "standalone.sh"). I see that BOTH "name" and
"node-name" match my new
>> server name:
>>
>> /core-service=server-environment/:read-attribute(name=node-name)
>> {
>> "outcome" => "success",
>> "result" => "foobar"
>> }
>>
>> /:read-attribute(name=name)
>> {
>> "outcome" => "success",
>> "result" => "foobar"
>> }
>>
>> QUESTION: Why the discrepency? Is this a bug or expected behavior? How
>> does one change the server's cluster node name (say, for the JGroups
>> configuration). I thought both would be equivalent (either setting <server
>> name="a"> or setting jboss.node.name) but that does not seem to be
the
>> case.
>>
>> Thanks,
>> John Mazz
>> _______________________________________________
>> wildfly-dev mailing list
>> wildfly-dev(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/wildfly-dev
>>
>
>
>
> --
> Best regards,
>
> *Dennis Brouwer*
> Extraordinary Goalkeeper
>
>
>
>
> ZEEF - Kizitos B.V.
> Amstelboulevard 184
> 1096 HM Amsterdam
> www.ZEEF.com <http://www.zeef.com/> <http://www.zeef.com/
<http://www.zeef.com/>>
> US: +1 (415) 992-9409
> NL: +31 (085) 888-3186
>
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3 comments
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participants (3)
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John Mazzitelli