Varnish Cache v3 configuration for subdomains

default.vcl

# Customizing Varnish Cache for subdomains

backend default {
  .host = "127.0.0.1";
  .port = "8080";
}

sub vcl_recv {
  # If exists any trouble, disable the cookie
  if (!req.backend.healthy) {
    unset req.http.Cookie;
  }

  # No-Cache: "nocache.domain.com"
  if (req.http.host ~ "nocache\.domain\.com") {
    return(pass);
  }

  # Cache: "domain.com", "cache.domain.com" and "cdn.domain.com"
  if (req.http.host ~ "(^((cache|cdn)\.)?domain\.com)$") {
    if (req.url ~ "\.(png|gif|jpg|swf|css|js|svg|eot|ttf|otf|ttc|webm|woff|woff2|mp3|mp4|ogg|flv|ogv|m4v|oga|pdf|csv|xls|xlsx|doc|docx|ppt|pptx|txt)$") {
      unset req.http.Cookie;
      return(lookup);
    }
  }
}

sub vcl_fetch {
  # Unset cookie: "domain.com", "cache.domain.com" and "cdn.domain.com"
  if (req.http.host ~ "(^((cache|cdn)\.)?domain\.com)$") {
    if (req.url ~ "\.(png|gif|jpg|swf|css|js|svg|eot|ttf|otf|ttc|webm|woff|woff2|mp3|mp4|ogg|flv|ogv|m4v|oga|pdf|csv|xls|xlsx|doc|docx|ppt|pptx|txt)$") {
      unset beresp.http.set-cookie;
    }
  }
}