Reverse proxy (nginx) + Apache

Dear,

I have nginx frontend and apache backend (I'm using Vestacp), now drupal 7.50 doesn't see external IP and log only server IP where I have installed drupal. I have controlled apache log and external IP are logged, but drupal can't read, my nginx.conf an apache2.conf where I have replaced mi internl IP with "x.x.x.x" and my domain with "mydomain.com"

nginx.conf

server {
    listen      x.x.x.x:80;
    server_name mydomain.com www.mydomain.com;
    error_log  /var/log/apache2/domains/mydomain.com.error.log error;

    location / {
        proxy_pass      http://x.x.x.x:8080;
        location ~* ^.+\.(jpeg|jpg|png|gif|bmp|ico|svg|tif|tiff|css|js|htm|html|ttf|otf|webp|woff|txt|csv|rtf|doc|docx|xls|xlsx|ppt|pptx|odf|odp|ods|odt|pdf|psd|ai|eot|eps|ps|z$
            root           /home/admin/web/mydomain.com/public_html;
            access_log     /var/log/apache2/domains/mydomain.com.log combined;
            access_log     /var/log/apache2/domains/mydomain.com.bytes bytes;
            expires        max;
            try_files      $uri @fallback;
        }
    }

    location /error/ {
        alias   /home/admin/web/mydomain.com/document_errors/;
    }

    location @fallback {
        proxy_pass      http://x.x.x.x:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Real-IP $remote_addr;

    }

    location ~ /\.ht    {return 404;}
    location ~ /\.svn/  {return 404;}
    location ~ /\.git/  {return 404;}
    location ~ /\.hg/   {return 404;}
    location ~ /\.bzr/  {return 404;}

    disable_symlinks if_not_owner from=/home/admin/web/mydomain.com/public_html;

    include /home/admin/conf/web/nginx.mydomain.com.conf*;
}

apache2.conf

<VirtualHost x.x.x.x:8080>

    ServerName mydomain.com
    ServerAlias www.mydomain.com
    ServerAdmin info@mydomain.com
    DocumentRoot /home/admin/web/mydomain.com/public_html
    ScriptAlias /cgi-bin/ /home/admin/web/mydomain.com/cgi-bin/
    Alias /vstats/ /home/admin/web/mydomain.com/stats/
    Alias /error/ /home/admin/web/mydomain.com/document_errors/
    #SuexecUserGroup admin admin
    CustomLog /var/log/apache2/domains/mydomain.com.bytes bytes
    CustomLog /var/log/apache2/domains/mydomain.com.log combined
    ErrorLog /var/log/apache2/domains/mydomain.com.error.log
    <Directory /home/admin/web/mydomain.com/public_html>
        AllowOverride All
        Options +Includes -Indexes +ExecCGI
    </Directory>
    <Directory /home/admin/web/mydomain.com/stats>
        AllowOverride All
    </Directory>

    <IfModule mod_ruid2.c>
        RMode config
        RUidGid admin admin
        RGroups www-data
    </IfModule>
    <IfModule itk.c>
        AssignUserID admin admin
    </IfModule>
    IncludeOptional /home/admin/conf/web/apache2.mydomain.com.conf*

</VirtualHost>

I can uderstand where is my error, and how configure drupal 7.50 for read external IP passed from apache.

I hope in little help.

Regards