FCGID notes

You need mod_fcgid and suexec enabled.

<VirtualHost *:80>
  ServerName drupal
  DocumentRoot /home/steph/webapps/drupal/
  <Directory "/home/steph/webapps/drupal/">
    Order allow,deny
    Allow from all
    AllowOverride All
    Options ExecCGI FollowSymLinks
  SuexecUserGroup steph steph
  AddHandler fcgid-script .php
  FCGIWrapper /home/steph/webapps/drupal/php5-fcgi .php

The important config is:

  • Options … which must be in the Directory block if the Directory block exists (though it seems to work on a server of mine where there’s no Directory block).
  • SuexecUserGroup …
  • AddHandler …
  • FCGIWrapper …

I’ve also seen it achieved with the following two lines instead of the AddHandler and FCGIWrapper given above:

AddHandler php-fcgi .php
Action php-fcgi /home/steph/webapps/drupal/php5-fcgi

Where /home/steph/webapps/drupal/php5-fcgi is the following:

export PHPRC
# See http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html
exec /usr/bin/php-cgi

Where /etc/php/cgi-php5/ holds the php config (presumably in php.ini) and /usr/bin/php-cgi is your PHP CGI executable.

/home/steph/webapps/drupal/php5-fcgi must be executable by the user steph, as given by the SuexecUserGroup line in the vhost config.


error reading data

Without suexec running, mod_fastcgi shows errors like the following in apache error log:

[Thu Oct 21 15:53:02 2010] [debug] fcgid_proc_unix.c(354): mod_fcgid: call /home/steph/webapps/drupal/index.php with wrapper /home/steph/webapps/drupal/php5-fcgi
[Thu Oct 21 15:53:02 2010] [info] mod_fcgid: server drupal:/home/steph/webapps/drupal/index.php(10270) started
[Thu Oct 21 15:53:02 2010] [warn] [client] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Thu Oct 21 15:53:02 2010] [error] [client] Premature end of script headers: index.php
[Thu Oct 21 15:53:05 2010] [info] mod_fcgid: process /home/steph/webapps/drupal/php5-fcgi(10270) exit(communication error), terminated by calling exit(), return code: 255

This could be due to file permissions.

target uid/gid mismatch

If you get an error like the following, make sure the directory that contains php5-fcgi has the correct ownership. That includes symlinks.

[2011-10-09 15:44:06]: uid: (1004/f3) gid: (1004/f3) cmd: php5-fcgi
[2011-10-09 15:44:06]: target uid/gid (1004/1004) mismatch with directory (1004/0) or program (1004/1004)

Increase timeout

If you get an error message in the apache error log similar to the following…

mod_fcgid: read data timeout in 40 seconds

…you can increase the timeout.

For gentoo, add the following to /etc/apache2/modules.d/20_mod_fcgid.conf:

IPCConnectTimeout 20
IPCCommTimeout 300

Or put them in your general apache config.

Note: I’m not sure of the best values to use.

Last modified: 21/10/2011 Tags: , ,

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