Federico,
503 would be due to a node being not responsive, you can configure your cluster
to disable a node after one or more failures with mod_cluster. now back to
mod_proxy_balancer and mod_proxy, if i understand correctly, you have a
scenario where you have one or more contexts served by all of the nodes in the
cluster, and another context served only by some nodes, i.e.:
Node1 => /foo,/bar
Node2 => /foo
Node3 => /foo,/bar
you want /foo to be served by all of the nodes, and /bar just by Node1, and
have Node3 as a hot standby (failover), if that is the case, you would probably
need multiple load balancers defined with two different location blocks, so
something like this:
<proxy balancer://foocluster>
BalancerMember http://node1:8080
BalancerMember http://node2:8080
BalancerMember http://node3:8080
</proxy>
<proxy balancer://barcluster>
BalancerMember http://node1:8080
# the hot standby on node3
BalancerMember http://node3:8080 status=+H
</proxy>
<location /foo>
ProxyPass balancer://foocluster
ProxyPassReverse http://node1:8080
ProxyPassReverse http://node2:8080
ProxyPassReverse http://node3:8080
</location>
<location /bar>
ProxyPass balancer://barcluster
ProxyPassReverse http://node1:8080
ProxyPassReverse http://node3:8080
</location>
i haven’t tested above configuration.
-Roman
On Jul 3, 2014, at 10:48 AM, Jeff Trawick <[email protected]> wrote:
> On Thu, Jul 3, 2014 at 9:57 AM, Federico Calì <[email protected]> wrote:
> Hi Roman,
> the mod_cluster is what we have actually in production.
> I want to change it, because the communication
> between Jboss and front-end sometimes fails with error 503.
> I would like to use ProxyPass in order to investigate if these kinds of
> errors will remain.
>
> It is very likely that you'll have the same problem, which is an issue,
> perhaps intermittent, with the backend server or application.
>
> Maybe one proxy implementation reacts a little better in your circumstance
> and/or can be configured to react better (e.g., recover more quickly), but
> you'll probably end up needing to diagnose the root cause either way.
>
>
> Federico
>
>
>
> Il 03/07/2014 15:15, Roman Jurkov ha scritto:
>> Federico,
>>
>> since you are using JBoss, i would suggest to look into mod_cluster instead.
>>
>> http://mod-cluster.jboss.org
>>
>> -Roman.
>>
>> On Jul 3, 2014, at 8:58 AM, Federico Calì <[email protected]> wrote:
>>
>>> Hi Eric,
>>>
>>> thanks for the hint but I think it's not what I need.
>>> Defining the standby node(s) in the balancer definition I might loss
>>> functionality for these reasons:
>>>
>>> - the JBoss cluster has both web applications deployed in HA Singleton that
>>> deployed in "statndard classic" [ie running on all nodes];
>>> For the second kinds of applications each request can be served by all
>>> back-end node.
>>>
>>> - I can't know which node is the HA Singleton Master;
>>>
>>> - I might need to extend the jboss cluster adding new nodes (2,3,..) but
>>> only one will be the master for HA Singleton web applications;
>>>
>>> Federico
>>>
>>>
>>> Il 03/07/2014 13:59, Eric Covener ha scritto:
>>>> On Thu, Jul 3, 2014 at 6:47 AM, Federico Calì <[email protected]> wrote:
>>>>> I'd like use Apache ProxyPass, with balancer directives, to refer these
>>>>> web
>>>>> applications,
>>>>> but I need that no requests are sent to the "stand-by" back-end node.
>>>> http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
>>>>
>>>> Search for "standby"
>>>>
>>>
>>> --
>>>
>>> .: Federico Calì
>>> .: TD Group S.p.A.
>>> .: Via del Fischione 19
>>> .: [Via Traversagna -Ingresso Zona C ]
>>> .: 56010 Migliarino Pisano (PI)
>>> .: 050-897406
>>> .: 348-2886628
>>
>> Nessun virus nel messaggio.
>> Controllato da AVG - www.avg.com
>> Versione: 2014.0.4592 / Database dei virus: 3986/7788 - Data di rilascio:
>> 03/07/2014
>>
>
> --
>
> .: Federico Calì
> .: TD Group S.p.A.
> .: Via del Fischione 19
> .: [Via Traversagna -Ingresso Zona C ]
> .: 56010 Migliarino Pisano (PI)
> .: 050-897406
> .: 348-2886628
>
>
>
> --
> Born in Roswell... married an alien...
> http://emptyhammock.com/
> http://edjective.org/
