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Nginx + R-T 3.8.10 + static FastCGI on CentOS 6.2: Can't start FastCGI service
 

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Chris.Doherty at ca

May 1, 2012, 8:32 AM


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Nginx + R-T 3.8.10 + static FastCGI on CentOS 6.2: Can't start FastCGI service

Hello, all. Having some difficulty with a FastCGI setup.

Summary: When I attempt to start the R-T FastCGI service, it does not
start. If I manually execute 'perl /usr/sbin/mason_handler.fcgi', it
*does* run correctly and emits the html for the R-T login page.

Detail:

It is a site standard that web apps must be fronted by nginx and run as
a FastCGI process on a socket. Our site standard Linux is CentOS 6.2
x64. RT-3.8.10 is packaged for CentOS by the EPEL group, but starts
with the assumption that you'll be running under apache and using
PostgreSQL for the back end DB (neither of which are true here).

I have been trying to set up an nginx+FastCGI stack for R-T, but
although there's documentation around the 'net, it's either extremely
out of date or is Ubuntu-specific. I have tried modifying things to
match CentOS without success.

What I have done so far:

Disabled SELinux (off by standard on internal servers).

Installed the following packages (mix of EPEL and CentOS) and their
prereqs: mysql-server perl-FCGI perl-CPAN make rt3 rt3-mailgate

Disabled the httpd service.

Created MySQL database for R-T, assigned privileges, and preloaded with
data from a testing R-T instance (running successfully on Ubuntu).

Installed the CommandByMail extension (this requires make and
perl-CPAN).

Setup the /etc/rt3/RT_SiteConfig.pm:
------------8<---------8<-----------------
# dynamically find out the current timezone
my $zone = "UTC";
$zone=`/bin/cat /etc/timezone`
if -f "/etc/timezone";
chomp $zone;
Set($Timezone, $zone);

# THE BASICS:
Set($rtname, 'tt.our.site');
Set($Organization, 'our.site');

Set($CorrespondAddress , 'helpdesk [at] our');
Set($CommentAddress , 'helpdesk-comment [at] our');

# THE WEBSERVER:

Set($WebPath , "/");
Set($WebBaseURL , "http://tt.our.site");

# THE DATABASE:

# map from dbconfig-common database types to their names as known by RT
my %typemap = (
mysql => 'mysql',
pgsql => 'Pg',
sqlite3 => 'SQLite',
);

Set($DatabaseType, $typemap{mysql} || "UNKNOWN");

Set($DatabaseHost, 'localhost');
Set($DatabasePort, '');

Set($DatabaseUser , 'rt');
Set($DatabasePassword , 'Password');

# SQLite needs a special case, since $DatabaseName must be a full
pathname
my $dbc_dbname = 'rtdb'; if ( "mysql" eq "sqlite3" ) { Set
($DatabaseName, '' . '/' . $dbc_dbname); } else { Set ($DatabaseName,
$dbc_dbname); }

# EXTENSIONS
# CommandByEmail
Set(@MailPlugins, qw(Auth::MailFrom Filter::TakeAction));
Set(@Plugins,(qw(RT::Extension::CommandByMail)));
Set($CommandByMailGroup, 9804);

1;
--------------8<------------------------8<-------------------

Set up the /etc/nginx/conf.d/tt.our.site.conf file:

--------------8<------------------------8<-------------------
server {
listen 80;
server_name tt.our.site;
root /usr/share/rt3/html;

location / {
index index.html;
fastcgi_pass unix:/var/run/rt/rt.sock;
include /etc/nginx/fastcgi.conf;
fastcgi_param PATH_INFO $fastcgi_script_name;
}

location ~* .+\.(html|js|css)$ {
index index.html;
fastcgi_pass unix:/var/run/rt/rt.sock;
include /etc/nginx/fastcgi.conf;
fastcgi_param PATH_INFO $fastcgi_script_name;
}

location /NoAuth/images/ {
alias /usr/share/rt3/html/NoAuth/images/;
}
}
---------------8<-----------------8<-----------------

Created an initrc file for the rt3 service, /etc/init.d/rt3:

---------------8<-----------------8<-----------------
#!/bin/sh

# rt3 - this script starts and stops the perl-FCGI RT3 daemon
#
# chkconfig: - 85 15
# description: RT3 is a request/issue handling system written in perl
served as a FastCGI module.


RTPATH=/usr/share/rt3/
RTUSER=nginx
FCGI_SOCKET_PATH=/var/run/rt3/rt3.sock

case $1 in
start)
echo -n "Starting RT: mason_handler.fcgi"
cd $RTPATH
export FCGI_SOCKET_PATH
su $RTUSER -c perl /usr/sbin/mason_handler.fcgi &
echo
;;

stop)
echo -n "Stopping RT: "
PIDS=`ps axww | awk '/[m]ason_handler.fcgi/ { print $1}'`
if [ -n "$PIDS" ]
then
echo -n kill -TERM $PIDS
kill $PIDS
echo
else
echo RT not running
fi
;;

restart|force-reload)
$0 stop
$0 start
;;

*)
echo "Usage: /etc/init.d/rt3 { stop | start | restart }"
exit 1
;;
esac
------------------------8<-----------------------8<------------------

Permissions on /usr/share/rt3 are 755 nginx:nginx all the way down
Permissions on /var/run/rt3 are 755 nginx:nginx


As I mentioned, if I run 'chkconfig rt3 on; service rt3 start' then the
process doesn't actually start (possibly it's starting and then
immediately exiting, but I'm having trouble trapping that).

If I run perl /usr/sbin/mason_handler.fcgi, then I get a non-fatal
warning followed by the Login page HTML:
-----------------------8<------------------------8<-----------------
[Tue May 1 15:25:12 2012] [warning]: Use of uninitialized value $method
in string ne at /usr/share/perl5/HTML/Mason/Utils.pm line 40.
(/usr/share/perl5/HTML/Mason/Utils.pm:40)
Set-Cookie: RT_SID_tt.our.site=08ca69d885bfb72426c13aa4b80fc95f; path=/
Date: Tue, 01 May 2012 15:25:12 GMT
Pragma: no-cache
Cache-control: no-cache
Content-Type: text/html; charset=utf-8

<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
[...]
----------------------8<---------------------------8<------------------

One thing I notice is that the socket file is not getting created; most
of the other FastCGI programs I work with (php-fpm, thin) will create
the socket file if it doesn't exist and they have the correct
permissions to do so.

Any ideas?


--
Chris Doherty
Software Engineer
Advanced Systems Engineering
FLEXComputing

chris.doherty [at] ca
www.flextronics.com
Ph +1 289 288 1509
Fax +1 289 288 1549



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Subject User Time
Nginx + R-T 3.8.10 + static FastCGI on CentOS 6.2: Can't start FastCGI service Chris.Doherty at ca May 1, 2012, 8:32 AM
    Re: Nginx + R-T 3.8.10 + static FastCGI on CentOS 6.2: Can't start FastCGI service ruz at bestpractical May 1, 2012, 9:40 AM

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