gistfile1.txt

#
# This is an example VCL file for Varnish.
#
# It does not do anything by default, delegating control to the
# builtin VCL. The builtin VCL is called when there is no explicit
# return statement.
#
# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/
# and http://varnish-cache.org/trac/wiki/VCLExamples for more examples.

# Marker to tell the VCL compiler that this VCL has been adapted to the
# new 4.0 format.
vcl 4.0;

import directors;
import std;

# Default backend definition. Set this to point to your content server.

# define our first nginx server
backend nginx01 {
  .host = "10.2.0.69";
  .port = "80";
  .probe = {
    .url = "/";
    .interval = 30s;
    .timeout = 1 s;
    .window = 5;
    .threshold = 3;
  }
}

# define our second nginx server
backend nginx02 {
  .host = "10.2.0.23";
  .port = "80";
  .probe = {
    .url = "/";
    .interval = 30s;
    .timeout = 1 s;
    .window = 5;
    .threshold = 3;
  }
}

# configure the load balancer
sub vcl_init {
  new rr = directors.round_robin();
  rr.add_backend(nginx01);
  rr.add_backend(nginx02);
}

# When a request is made set the backend to the round-robin director named nginx
sub vcl_recv {
  set req.backend_hint = rr.backend();

  if (req.restarts == 0) {
    if (req.http.x-forwarded-for) {
        set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip;
     } else {
        set req.http.X-Forwarded-For = client.ip;
     }
  }

  if (req.method != "GET" && req.method != "HEAD") {
     /* We only deal with GET and HEAD by default */
     return (pass);
   }
  # Remove all cookies that Drupal doesn't need to know about. ANY remaining
  # cookie will cause the request to pass-through to Apache. For the most part
  # we always set the NO_CACHE cookie after any POST request, disabling the
  # Varnish cache temporarily. The session cookie allows all authenticated users
  # to pass through as long as they're logged in.
  if (req.http.Cookie) {
     # Prepend semicolon for the regexes below to work.
    set req.http.Cookie = ";" + req.http.Cookie;

    # Remove spaces after the semicolons separating cookies.
    set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");

    # Put space folloing semicolon back for whitelisted cookies.
    set req.http.Cookie = regsuball(req.http.Cookie, ";(SESS[0-9a-f]+|NO_CACHE|csrftoken|sessionid|[a-z_]+session|sam_currency_country)=", "; \1=");

    set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|has_js)=[^;]*", "");

    # Remove cookies not preceeded by a space.
    set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");

    # Strip semicolons and spaces from the start and the end of the cookie string.
    set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");

    if (req.http.Cookie == "") {
      # If there are no remaining cookies, remove the cookie header. If there
      # aren't any cookie headers, Varnish's default behavior will be to cache
      # the page.
      unset req.http.Cookie;
    }
    else {
      # If there are any cookies left (a session or NO_CACHE cookie), do not
      # cache the page. Pass it on to Apache directly.
      return (pass);
    }
  }

  // Skip the Varnish cache for install, update, and cron
  if (req.url ~ "install\.php|update\.php|cron\.php") {
    return (pass);
  }

  return (hash);
}

sub vcl_deliver {
  set resp.http.grace = req.http.grace;
}

sub vcl_backend_response {
  if (bereq.url ~ "\.(png|gif|jpg|swf|css|js)$") {
    // For Varnish 2.0 or earlier, replace beresp with obj:
    // unset obj.http.set-cookie;
    unset beresp.http.set-cookie;
  }
}