/etc/nginx/conf.d/social_network.conf.txt (он его должен подключать ls /etc/nginx/conf.d/*.conf выдал /etc/nginx/conf.d/php-fpm.conf*)server {
    listen   80;
    server_name social_network.loc;
    root   var/www/social_network.loc/advanced/backend/views/site/;
    index  index.php;
    # main cakephp rewrite rule
    location / {
        try_files $uri $uri/ /index.php?$uri&$args;
	autoindex on;
    }
        location ~ .php$ {
            root           var/www/social_network.loc/advanced/backend/views/site;
            #try_files $uri =404;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
            fastcgi_buffer_size 128k;
            fastcgi_buffers 256 4k;
            fastcgi_busy_buffers_size 256k;
            fastcgi_temp_file_write_size 256k;
        }
}775 var/www/social_network.loc/ и chown Yuri:Yuri/etc/nginx/nginx.conf# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
events {
    worker_connections 1024;
}
http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 ;
        listen       [::]:80 ;
        server_name  _;
        root         /var/www/;
        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;
        location / {
        }
        error_page 404 /404.html;
            location = /40x.html {
        }
        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}Systemctl restart nginx.service тоже делал        $I = new AcceptanceTester($scenario);
$I->amOnPage('/index.html');
$I->executeJS("
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'code.jquery.com/jquery-1.8.3.js';
document.head.appendChild(script);
");
$I->executeJS('$(window).trigger($.Event("keydown", { keyCode: 39 }));');
Если бы решение было бы так элементарно
sudo chmod -R 777 var/logs var/cache, то я бы тут не спрашивал.:)