[Paraview] Apache Front-end not working: java.net.ConnectException: Connection refused

Sat Apr 19 02:11:35 EDT 2014

Hi Sebastien,

I think ParaViewWeb finally work on my local machine. It seems that I should not close my terminal after I run java -jar JettySessionManager-Server-1.1.jar pw-config.properties &  in the background. If I close the terminal, the http://localhost/apps/Visualizer does not work anymore. Is there anyway to solve this? 

I have apache 2.2 (From Lampstack, in etc/apache2 directory) and apache 2.4.9 (For ParaViewWeb, in /opt/apache2.4.9 directory). Is it possible for me to run ParaViewWeb on apache 2.2? If not, Is it possible to update apache 2.2 to apache 2.4.9 perhaps? I have searched through online, but I could not find anything helpful. 

I am almost ready to deploy ParaViewWeb to an Amazon EC2 Instance, and the server uses Ubuntu. On "How to set up an Amazon EC2 AMI instance to run ParaViewWeb" I believe some commands are based on RedHat Linux system. 

$ sudo yum install patch.x86_64
$ sudo yum install pcre-devel.x86_64
$ sudo yum install mesa-libGLU.x86_64
$ sudo yum install xorg*$ sudo nvidia-config

Do you know what are the Ubuntu commands for these packages? I tried sudo apt-get install XXXXX for all of these, but they don't seem to work. Thank you!

Kai

On Friday, April 18, 2014 10:58 AM, Sebastien Jourdain <sebastien.jourdain at kitware.com> wrote:

Hi Kai,

both apache and jetty are a web server, and you can only have one process using the port 80.
So if you want apache to be the web server, you need jetty to pick something else than port 80 (and it can be anything).
The only thing is that apache need to be aware on which port jetty is running so it could forward all the launch request to jetty which is in the config that you wrote for apache with port 8080...

Seb

On Thu, Apr 17, 2014 at 11:00 PM, kai liu <liuwukai at yahoo.com> wrote:

Hi Sebastien,
>
>
>I changed pw-config.properties file's pw.web.port=80 since I want to use Apache as front-end. I fixed pw.factory.session.url.generator.pattern=ws://viz.local/proxy?sessionId=SESSION_ID. When I run java -jar JettySessionManager-Server-1.1.jar pw-config.properties, I got the following errors:
>
>
>==== Starting ParaViewWeb multi-user front-end ====
>Configuration: /home/kai/Desktop/ParaViewWeb/pw-config.properties
>WebContent: /var/www/pvweb-deploy/www
>Port: 80
>===================================================
>
>
>2014-04-18 00:35:33.281:INFO:oejs.Server:jetty-8.y.z-SNAPSHOT
>2014-04-18 00:35:33.435:WARN:oejuc.AbstractLifeCycle:FAILED SelectChannelConnector at 0.0.0.0:80: java.net.SocketException: Permission denied
>java.net.SocketException: Permission denied
>
>
>at sun.nio.ch.Net.bind0(Native Method)
>at sun.nio.ch.Net.bind(Net.java:444)
>at sun.nio.ch.Net.bind(Net.java:436)
>at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
>
>
>
>
>If I set pw-config.properties file's pw.web.port=8080, the result for opt/apache-2.4.7/pv-mapping-file/mapping.txt:
>
>
>                      {"f6ac78f2-4c2c-4da2-ae33-a0b514a5ea1e":{"host":"localhost","port":9100}}
>
>
>
>
>
>
>
>and home/pvweb/ParaView/launcher/logs has the following output
>
>
>
>
>/home/kai/Desktop/ParaViewWeb/build/lib/site-packages/zope/__init__.py:3: UserWarning: Module twisted was already imported from /home/kai/Desktop/ParaViewWeb/build/lib/site-packages/twisted/__init__.pyc, but /usr/local/lib/python2.7/dist-packages/Twisted-13.1.0-py2.7-linux-i686.egg is being added to sys.path
>  import pkg_resources
>
>
>
>
>I believe  Jetty can write/create. When you said run as http://localhost/apps/Visualizer, shouldn't it be http://localhost:8080/apps/Visualizer if I have pw.web.port=8080. http://localhost/apps/Visualizer give me page cannot found. 
>
>
>I am so sorry if I misinterpret anything. Thank you for your patient ! 
>
>
>
>
>
>
>Kai 
>
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>
>
>------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
>On Thursday, April 17, 2014 1:11 AM, Sebastien Jourdain <sebastien.jourdain at kitware.com> wrote:
> 
>First of all, if you are using apache as a front-end, you should connect on port 80 not 9000. Otherwise, that means that you are using Jetty as your web server not apache.
>
>
>Moreover, you've asked Jetty to tell the client to connect to "viz.local" which is supposed to be the exact same URL that you are starting with and not http://localhost:9000/xxxx.
>
>
>On top of that, can Jetty write/create that file? /opt/apache-2.4.7/pv-mapping-file/mapping.txt
>And can apache read it?
>
>
>What you should try for your local test:
>
>
>1) Fix the pw-config.properties
>
>
>pw.factory.session.url.generator.pattern=ws://viz.local/proxy?sessionId=SESSION_ID
>
>==> pw.factory.session.url.generator.pattern=ws://localhost/proxy?sessionId=SESSION_ID
>
>
>(I'm assuming the rest of the path are OK and ParaView works on that machine.
>
>
>2) Connect with firefox and firebug open to http://localhost/apps/Visualizer
>
>
>3) Check what is happening in the console,  /opt/apache-2.4.7/pv-mapping-file/mapping.txt file and the content of the directory /home/pvweb/ParaView/launcher/logs
>
>
>Seb
>
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>
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>
>
>On Wed, Apr 16, 2014 at 9:54 PM, kai liu <liuwukai at yahoo.com> wrote:
>
>Hi
>>
>>
>>I complied offscreen OSMesa ParaViewWeb, but I do not know how to use Apache as front-end. I have followed both "How to use Apache as Frotn-end" and "How to set up an Amazon EC2 AMI instance to run ParaViewWeb" guides, but I could not get it to work. 
>>
>>
>>I run the command "java -jar JettySessionManager-Server-1.1.jar pw-config.properties", and then I input the link  http://localhost:9000/apps/Visualizer on the browser. I always got the following error:
>>
>>
>>2014-04-16 23:45:23.355:INFO:oejs.Server:jetty-8.y.z-SNAPSHOT
>>2014-04-16 23:45:23.487:INFO:oejs.AbstractConnector:Started SelectChannelConnector at 0.0.0.0:9000
>>Apr 16, 2014 11:45:37 PM com.kitware.paraviewweb.websocket.WebSocketForwarder onOpen INFO: null
>>java.util.concurrent.ExecutionException: java.net.ConnectException: Connection refused
>>at org.eclipse.jetty.websocket.WebSocketClient$WebSocketFuture.get(WebSocketClient.java:569)
>>at org.eclipse.jetty.websocket.WebSocketClient$WebSocketFuture.get(WebSocketClient.java:372)
>>at com.kitware.paraviewweb.websocket.WebSocketForwarder.onOpen(WebSocketForwarder.java:54)
>>..........................
>>..........................
>>
>>
>> 
>>  I feel I did not missed any steps while following the  "How to set up an Amazon EC2 AMI instance to run ParaViewWeb" guide, but I always get the above error when I run it. I use apache-2.4.9 since I could not find apache-2.4.7 online. I attached pw-config.properties.  I run everything on Localhost first because I do not want to screw up my Amazon EC2 instance. 
>>
>>
>>
>>
>>Is it okay to put ServerName 127.0.1.1 instead of my instance DNS name since I am running on localhost? Thank you!
>>
>>
>><VirtualHost*:80>ServerName ec2-XXX-XXX-XXX-XXX.compute-1.amazonaws.com ServerAdmin webmaster at example-host.example.com DocumentRoot "/var/www/pvweb-deploy/www" ErrorLog "logs/pv-error_log" CustomLog "logs/pv-access_log" common ProxyPass /paraview http://localhost:9000/paraview # Turn on the rewrite engine RewriteEngine On # This is the path the mapping file Jetty creates RewriteMap session-to-port txt:/opt/apache-2.4.7/pv-mapping-file/mapping.txt # This is the rewrite condition. Look for anything with a sessionId= in the query part of the URL and capture the value to use below. RewriteCond %{QUERY_STRING}     ^sessionId=(.*)$ [NC] # This does the rewrite using the mapping file and the sessionId RewriteRule    ^/proxy.*$  ws://${session-to-port:%1}/ws  [P] <Directory"/var/www/pvweb-deploy/www">Options Indexes FollowSymLinks Order allow,deny Allow from all AllowOverride None Require all granted </Directory></VirtualHost>
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