10:53 p.m.
Hi,
I've tried to play AS7 with clustering mode and seems failed on last step. Here's
what I did:
1. Prepare two hosts: one is 'master' (10.0.2.3), the other one is
'slave' (10.0.2.2)
2. 'master' is domain controller
3. deploy a 'hello-world' web app into domain. The project is extremely simple:
just a index.jsp and web.xml. In web.xml there is a <distributable/>.
4. The contents in index.jsp:
<% System.out.println( "Evaluating date now" ); java.util.Date date = new
java.util.Date(); %>
5. Start two hosts, the domain seems run correctly, and the web-app is deployed correctly
in domain. From log from both 'master' and 'slave', they are all fine:
slave log: [Server:server-three-slave] 12:25:18,673 INFO [stdout] (MSC service thread
1-2) GMS: address=server-three-slave/web, cluster=web, physical address=10.0.2.2:55450
master log: [Server:server-three] 12:25:12,885 INFO [stdout] (MSC service thread 1-1)
GMS: address=server-three/web, cluster=web, physical address=10.0.2.3:55450
6. Start apache httpd with mod_cluster setup, and seeing from the log everything is
fine:
httpd log: [Wed Jan 18 12:13:25 2012] [notice] Digest: done
[Wed Jan 18 12:13:25 2012] [notice] Advertise initialized for process 11716
[Wed Jan 18 12:13:25 2012] [notice] Apache/2.2.15 (Unix) DAV/2 mod_cluster/1.1.x
configured -- resuming normal operations
master log: [Server:server-three] 12:25:21,339 INFO
[org.jboss.modcluster.ModClusterService]
(ContainerBackgroundProcessor[StandardEngine[jboss.web]]) Engine [jboss.web] will use
jvmRoute: b5c2598e-49fb-3c4b-996c-f3451747f44a
7. the httpd is run on 10.0.2.3
8. try to access cluster from http://10.0.2.3/demo, it redirects me to:
http://10.0.2.3:8330/demo, and I could see the 'hello world' projects page. Seems
everything is fine, domain works, cluster works, and web project in jboss domain can be
accessed correctly via mod_cluster. BUT here is the problem:
There's some communication problem between mod_cluster on 'master' (10.0.2.3)
and the host on 'slave' (10.0.2.2), if the jboss host on 'slave' is run
and registered into domain controller, mod_cluster begins to throw error:
% tail -f /etc/httpd/logs/error_log
[Wed Jan 18 01:21:59 2012] [error] (111)Connection refused: proxy: http: attempt to
connect to 127.0.0.1:8330 (localhost) failed
[Wed Jan 18 01:21:59 2012] [error] ap_proxy_connect_backend disabling worker for
(localhost)
[Wed Jan 18 01:22:00 2012] [error] proxy: http: disabled connection for (localhost)
So the result becomes that only 'master' is serving the request from
http://10.0.2.3/demo
This could be seen when we access the index.jsp in demo project, because in jsp we have:
<% System.out.println( "Evaluating date now" ); java.util.Date date = new
java.util.Date(); %>
We can only see the log output in 'master':
[Server:server-three] 12:15:33,041 INFO [stdout] (http--10.0.2.3-9138-1) Evaluating date
now
And I've tried to use multiple web browsers / different computers to access the
cluster, all I can see is that only 'master' is serving the requests,
'slave' is idle all the time.
I'm using jboss-as-7.1.0.CR1b in my environment (there are bugs in previous version
in infinispan/as7 integration on clustering). And I'm using
mod_cluster-1.1.3.Final-linux2-x86-so.tar.gz for httpd part.
And here's my mod_cluster conf:
Listen 10.0.2.3:6666
<VirtualHost 10.0.2.3:6666>
<Directory />
Order deny,allow
Deny from all
Allow from 10.0.2.
</Directory>
KeepAliveTimeout 60
MaxKeepAliveRequests 0
ManagerBalancerName other-server-group
AdvertiseFrequency 5
</VirtualHost>
I can ensure that domain are set correctly. So I believe the problem should be in
mod_cluster/as7 integration part. But I cannot find what I'm doing wrong on my
configurations, can anyone help?
Cheers,
- Weinan Li
JBoss, Redhat