FastCGI on Apache¶
You'll need to enable mod_fastcgi first for Apache. In most cases, this is done by linking the module's configuration file
mods-enabled (this can be done with
a2enmod on Debian and Ubuntu).
Next you need to modify the configuation file:
<IfModule mod_fastcgi.c> AddHandler fastcgi-script .wt FastCgiIpcDir /var/lib/apache2/fastcgi FastCgiConfig -idle-timeout 100 -maxClassProcesses 1 -initial-env WT_APP_ROOT=/tmp </IfModule>
This will automatically start any file ending with
.wt as a FastCGI executable. You can also use "external CGIs", which allow you to control in more detail how a single application gets started (and restarted):
FastCgiExternalServer /var/www/wt-examples/simplechat/simplechat.wt -host localhost:9091 -idle-timeout 200
For this latter deployment option, you need to use the FastCGI utility
cgi-fcgi to run the Wt application independent of the web server. When a request for the application is received by the web server, it is forwarded to your FastCGI application using the FastCGI protocol over the given TCP connection.
The only thing left to do is enable CGI execution in your Apache configuration (see below).
You'll need to enable mod_fcgid first for Apache. In most cases, this is done by linking the module's configuration file
mods-enabled (this can be done by running
Next you need to modify the configuration file:
<IfModule mod_fcgid.c> AddHandler fcgid-script .wt SocketPath /var/lib/apache2/fcgid/sock IdleTimeout -1 ProcessLifeTime -1 MaxProcessCount 10 DefaultMaxClassProcessCount 10 DefaultMinClassProcessCount 1 </IfModule>
and then do this command:
chown www-data:www-data /var/run/wt -R
Enabling CGI in Apache¶
Next, we create a new "site" configuration file for Wt applications:
/etc/apache2/sites-available/wt which we will install in
/var/www/wt (this must be a directory within your docroot):
<Directory /var/www/wt/> #Order Deny,Allow Allow from all # Enable CGIs to be executed Options ExecCGI </Directory>
Then, we need to create folder /var/run/wt and to give the Apache server write permissions to that directory.
Next I enable the site and reload Apache:
a2ensite wt /etc/init.d/apache2 reload
If it does not work¶
You may need to create a run directory with the proper permissions:
sudo mkdir /var/run/wt sudo chown www-data:www-data /var/run/wt -R
Verify that you have at least two threads configured in /etc/wt/wt_config.xml:
Ensure yourself that your wt application is linked against libwtfcgi instead of libwthttpd. E.g. in your own CMakeLists.txt, write
target_link_libraries(hello.wt wt wtfcgi .......)
or for the examples included with Wt, set EXAMPLES_CONNECTOR to wtfcgi:
Look for errors in your apache error log. Especially if you see wt complaining about 'stat' and 'docroot not being set', this means that your executable is linked to wthttpd instead of wtfastcgi; in this case you need to fix your linker options first.