how to create many templates with an increasing variable (counter) in each?

[vovans...@gmail.com]

Hi,

I need to create configuration files for php5-fpm and nginx for many domains. Each php5-fpm's worker should run on separate port starting from 127.0.0.1:9001 and so on.

I started with the following configuration:

   - role: webserver

     sites:
     - name: user
       site:
       - test.com
       - test.org
     - name: mike
       site:
       - domain.com
       - domain.org

tasks:

  - name: create nginx-domain.conf
    template: src=nginx-domain.conf.j2 dest=/etc/nginx/conf.d/{{ item.1 }}.conf backup=yes
    with_subelements:
    - sites
    - site
    notify: Reload nginx

  - name: create php5-fpm-domain.conf
    template: src=php5-fpm-domain.conf.j2 dest=/etc/php5/fpm/pool.d/{{ item.1 }}.conf backup=yes
    with_subelements:
    - sites
    - site
    notify: Reload php

nginx-domain.conf.j2:

server {

    listen         80;
    server_name    {{ item.1 }};
    error_log /home/{{ item.0.name }}/logs/{{ item.1 }}.error.log error;
    access_log /home/{{ item.0.name }}/logs/{{ item.1 }}.access.log combined buffer=16k flush=1m;

    root /www/{{ item.0.name }}/domains/{{ item.1 }}/public_html/;
    set $sock 127.0.0.1:{{ counter }}

    include fastcgi_params;
    fastcgi_index index.php;
    fastcgi_intercept_errors on;
    fastcgi_param DOCUMENT_ROOT /public_html;
    fastcgi_param SCRIPT_FILENAME /public_html$fastcgi_script_name;

    index index.html index.php;

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    location ~* \.php$ {
        try_files $fastcgi_script_name =404;
        fastcgi_pass $sock;
    }

}

so, i need to increase {{ counter }} starting from 9001 in a template for every domain to use it in line 'set $sock 127.0.0.1:{{ counter }}', but i don't know how to do that. i didn't find anything useful via google/stackoverflow.
Maybe you can give me a hint or even some examples in which way to dig?