Re: HTTP requests on a servicemix cluster

Wed, 10 Mar 2010 05:27:58 -0800 

Hi,
in fact, the ProxyPass is important and should match your service context root. 

For example, you should make
[...]
ServerName lbhost
[...]
<Proxy balancer://smx_bridge>
        BalancerMember http://host1:8192/bridge
        BalancerMember http://host2:8192/bridge
</Proxy>
ProxyPass /bridge balancer://smx_bridge

<Proxy balancer://smx_s2>
        BalancerMember http://host1:8192/s2
        BalancerMember http://host2:8192/s2
</Proxy>
ProxyPass /s2 balancer://smx_s2


In that case, http://lbhost/bridge will load balance to bridge service 
and http://lbhost/s2 will load balance to s2 service.

Like this you can "control" what services you want to load balance

Another way is to load balance all requests, like this:

<Proxy balancer://smx>
        BalancerMember http://host1:8192/
        BalancerMember http://host2:8192/
</Proxy>
ProxyPass / balancer://smx


Like this, you can use http://lbhost/bridge and http://lbhost/s2 and all 
new services deployed in ServiceMix instances will available to the load 
balancer.


Regards
JB

Deepika wrote:

Thanks for the quick response JB. My question was about accessing multiple
Services deployed on the servicemix instances from the mod_proxy_balancer.
For example if service1 is available through 'http://hostname:8192/bridge',
I would enter below lines in httpd.conf:
        <Proxy balancer://servicemixcluster>
        BalancerMember http://host1:8192/bridge
        BalancerMember http://host2:8192/bridge
        </Proxy>
        ProxyPass /servicemix balancer://servicemixcluster
lbmethod=byrequests

Now I deploy service2 on host1 and host2 which is available through
'http://hostname:8192/s2', should I be adding the below lines to http.conf?
or is there another way out to avoid adding the stanza everytime a new
service is deployed?
        <Proxy balancer://servicemixcluster1>
        BalancerMember http://host1:8192/s2
        BalancerMember http://host2:8192/s2
        </Proxy>
        ProxyPass /servicemix1 balancer://servicemixcluster1
lbmethod=byrequests

Thanks in advance for your time,
Deepika

-----Original Message-----

From: Jean-Baptiste Onofré [mailto:[email protected]] 
Sent: Wednesday, March 10, 2010 6:26 PM

To: Deepika
Cc: [email protected]
Subject: Re: HTTP requests on a servicemix cluster

Hi Deepika,


The mod_proxy_balancer can support more than two balancer members. It 
depends on the scheduler algorithm that you use.
You can use request counting, weighted traffic counting and pending 
request counting.

You can choose it using the lbmethod.


For example, if you use lbmethod=byrequests (request counting), the 
requests are distributed among the various workers to ensure that each 
gets their configured share of the number of requests. It works as follows:

- lbfactor is "worker's work quota" (the share of amount work to be done)
- lbstatus is "how urgent has to work to fulfill its quota of work".

You can have more information here:
http://httpd.apache.org/docs/2.1/mod/mod_proxy_balancer.html

Regards
JB

Deepika wrote:

Thanks for your response JB. I implemented the mod_proxy_balancer and am

now

able to load balance the HTTP requests.
1 quick question: If I have multiple HTTP Services(say 3) deployed in both
servicemix1 and servicemix2, should I specify three <Proxy balancer:> sets
in httpd.conf or should the httpd.conf have the generic urls pointing to
servicemix instances and the service configuration be done somewhere else?

Thanks for your time on this,
Deepika

-----Original Message-----

From: Jean-Baptiste Onofré [mailto:[email protected]] 
Sent: Friday, February 26, 2010 8:50 PM

To: [email protected]
Subject: Re: HTTP requests on a servicemix cluster

Hi Deepika,

I guess that you point http://servicemix1:port/...

In that case, only the servicemix1 node will manage your request.


It's not ServiceMix which manage this. You need to add a kind of load 
balancer in front on ServiceMix.

This load balancer could be hardware (F5, Cisco) or software.

For example, using Apache mod_proxy_balancer, you can use something like:

<Proxy balancer://servicemixcluster>
BalancerMember http://servicemix1:8181
BalancerMember http://servicemix2:8181
</Proxy>
ProxyPass /servicemix balancer://servicemixcluster

Regards
JB

Deepika wrote:

Hi All,

I am using SMX 3.3.1 on Windows XP and am learning on the cluster
functionality available.
I have two servicemix instances in cluster. I have tested clustering
functionality in the following way:
Deployed a file poller,sender service assembly on both the instances.

Both

instances are polling on the same directory(a shared folder). When I put
sample xmls in the poller directory, I see that some files are processed

by

servicemix1 and others by the instance servicemix2.

But when I deployed a HTTP example on both instances, I observed that all
the HTTP requests are being processed only by servicemix1. What
configuration is required for the HTTP requests to be processed by both

the

servicemix instances? Is it possible with the SMX 3.3.1 install alone?

Thanks in Advance,
Deepika

























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