http://blog.nomadscafe.jp/2013/01/plackapachenagios.html

install.sh

#!/bin/bash
sudo yum install nagios
sudo install -o nagios -g nagios -d /usr/local/nagios/plack
cd /usr/local/nagios/plack
curl -kL http://cpanmin.us/ | /usr/bin/perl - -n -lextlib Plack \
  Plack::App::PHPCGI Plack::Builder::Conditionals \
  Plack::Middleware::ReverseProxy CGI::Compile Starlet

nagios-web.conf

[program:nagios-web]
process_name=%(program_name)s
command=/usr/bin/perl -Mlib=/usr/local/nagios/plack/extlib/lib/perl5 /usr/local/nagios/plack/extlib/bin/plackup -s Starlet -p 5000 /usr/local/nagios/plack/nagios_web.psgi
autostart=true
autorestart=true
user=nagios
redirect_stderr=true
stdout_logfile=/var/log/nagios/%(program_name)s.log
stdout_logfile_maxbytes=5MB

nagios_web.psgi

use Plack::App::CGIBin;
use Plack::App::PHPCGIFile;
use Plack::Builder;
use Plack::Builder::Conditionals;

my $cgibin = Plack::App::CGIBin->new(
    root => "/usr/lib64/nagios/cgi-bin",
    exec_cb => sub { my $file = shift; $file =~ m!\.cgi$! and -x $file },
)->to_app;
my $htdocs = Plack::App::PHPCGIFile->new(
    root => '/usr/share/nagios/html'
)->to_app;

builder {
    enable match_if addr([qw!127.0.0.1!]), 'ReverseProxy';
    enable sub {
        my $apps = shift;
        sub {
            my $env = shift;
            return [302,[Location=>'http://'.$env->{HTTP_HOST}.'/nagios/'],['moved']] if $env->{PATH_INFO} =~ m!^/(nagios)?$!;
            $env->{REMOTE_USER} = 'nagiosadmin';
            $env->{PATH_INFO} .= 'index.php'
                if $env->{PATH_INFO} =~ m!^/nagios/([^\.]+/)*$!;
            $apps->($env);
        };
    };
    mount '/nagios/cgi-bin' => $cgibin,
    mount '/nagios' => $htdocs,
}

nginx.conf

location /nagios {
    proxy_pass                 http://127.0.0.1:5000/nagios;
    proxy_redirect             off;
    proxy_set_header           Host               $host;
    proxy_set_header           X-Real-IP          $remote_addr;
    proxy_set_header           X-Forwarded-Host   $host;
    proxy_set_header           X-Forwarded-Server $host;
    proxy_set_header           X-Forwarded-For    $proxy_add_x_forwarded_for;
    proxy_connect_timeout      10;
    proxy_send_timeout         60;
    proxy_read_timeout         60;
}

permission.sh

#!/bin/bash
sudo chown root.nagios /usr/share/nagios/html/config.inc.php