1+ #
2+ # Customized VCL file for serving up a Drupal site with multiple back-ends.
3+ #
4+ # For more information on this VCL, visit the Lullabot article:
5+ # http://www.lullabot.com/articles/varnish-multiple-web-servers-drupal
6+ #
7+
8+ # Define the internal network subnet.
9+ # These are used below to allow internal access to certain files while not
10+ # allowing access from the public internet.
11+ acl internal {
12+ " 127.0.0.1"
13+ }
14+
15+ # Define the list of backends (web servers).
16+ # Port 80 Backend Servers
17+ backend web1 { .host = " 127.0.0.1" .probe = { .url = " /status.php" .interval = 5s ; .timeout = 1s ; .window = 5 ;.threshold = 3 ; }}
18+
19+ # Define the director that determines how to distribute incoming requests.
20+ director default_director round-robin {
21+ { .backend = web1; }
22+ }
23+
24+ # Respond to incoming requests.
25+ sub vcl_recv {
26+ set req.backend = default_director;
27+
28+ # Use anonymous, cached pages if all backends are down.
29+ if (!req.backend.healthy ) {
30+ unset req.http.Cookie ;
31+ }
32+
33+ # Allow the backend to serve up stale content if it is responding slowly.
34+ set req.grace = 6h ;
35+
36+ # Do not cache these paths.
37+ if (req.url ~ " ^/status\.php$"
38+ req.url ~ " ^/update\.php$"
39+ req.url ~ " ^/ooyala/ping$"
40+ req.url ~ " ^/admin/build/features"
41+ req.url ~ " ^/info/.*$"
42+ req.url ~ " ^/flag/.*$"
43+ req.url ~ " ^.*/ajax/.*$"
44+ req.url ~ " ^.*/ahah/.*$"
45+ return (pass );
46+ }
47+
48+ # Pipe these paths directly to Apache for streaming.
49+ if (req.url ~ " ^/admin/content/backup_migrate/export"
50+ return (pipe );
51+ }
52+
53+ # Do not allow outside access to cron.php or install.php.
54+ if (req.url ~ " ^/(cron|install)\.php$" client.ip ~ internal) {
55+ # Have Varnish throw the error directly.
56+ error 404 " Page not found."
57+ # Use a custom error page that you've defined in Drupal at the path "404".
58+ # set req.url = "/404";
59+ }
60+
61+ # Handle compression correctly. Different browsers send different
62+ # "Accept-Encoding" headers, even though they mostly all support the same
63+ # compression mechanisms. By consolidating these compression headers into
64+ # a consistent format, we can reduce the size of the cache and get more hits.=
65+ # @see: http:// varnish.projects.linpro.no/wiki/FAQ/Compression
66+ if (req.http.Accept-Encoding ) {
67+ if (req.http.Accept-Encoding ~ " gzip"
68+ # If the browser supports it, we'll use gzip.
69+ set req.http.Accept-Encoding = " gzip"
70+ }
71+ else if (req.http.Accept-Encoding ~ " deflate"
72+ # Next, try deflate if it is supported.
73+ set req.http.Accept-Encoding = " deflate"
74+ }
75+ else {
76+ # Unknown algorithm. Remove it and send unencoded.
77+ unset req.http.Accept-Encoding ;
78+ }
79+ }
80+
81+ # Always cache the following file types for all users.
82+ if (req.url ~ " (?i)\.(png|gif|jpeg|jpg|ico|swf|css|js|html|htm)(\?[a-z0-9\=\.]+)?$"
83+ unset req.http.Cookie ;
84+ }
85+
86+ # Remove all cookies that Drupal doesn't need to know about. ANY remaining
87+ # cookie will cause the request to pass-through to Apache. For the most part
88+ # we always set the NO_CACHE cookie after any POST request, disabling the
89+ # Varnish cache temporarily. The session cookie allows all authenticated users
90+ # to pass through as long as they're logged in.
91+ if (req.http.Cookie ) {
92+ set req.http.Cookie = " ;" req.http.Cookie ;
93+ set req.http.Cookie = regsuball (req.http.Cookie , " ; +" " ;"
94+ set req.http.Cookie = regsuball (req.http.Cookie , " ;(SESS[a-z0-9]+|NO_CACHE)=" " ; \1="
95+ set req.http.Cookie = regsuball (req.http.Cookie , " ;[^ ][^;]*" " "
96+ set req.http.Cookie = regsuball (req.http.Cookie , " ^[; ]+|[; ]+$" " "
97+
98+ if (req.http.Cookie == " "
99+ # If there are no remaining cookies, remove the cookie header. If there
100+ # aren't any cookie headers, Varnish's default behavior will be to cache
101+ # the page.
102+ unset req.http.Cookie ;
103+ }
104+ else {
105+ # If there is any cookies left (a session or NO_CACHE cookie), do not
106+ # cache the page. Pass it on to Apache directly.
107+ return (pass );
108+ }
109+ }
110+ }
111+
112+ # Routine used to determine the cache key if storing/retrieving a cached page.
113+ sub vcl_hash {
114+ # Include cookie in cache hash.
115+ # This check is unnecessary because we already pass on all cookies.
116+ # if (req.http.Cookie) {
117+ # set req.hash += req.http.Cookie;
118+ # }
119+ }
120+
121+ # Code determining what to do when serving items from the Apache servers.
122+ sub vcl_fetch {
123+ # Don't allow static files to set cookies.
124+ if (req.url ~ " (?i)\.(png|gif|jpeg|jpg|ico|swf|css|js|html|htm)(\?[a-z0-9\=\.]+)?$"
125+ # beresp == Back-end response from the web server.
126+ unset beresp.http.set-cookie ;
127+ }
128+
129+ # Allow items to be stale if needed.
130+ set beresp.grace = 6h ;
131+ }
132+
133+ # In the event of an error, show friendlier messages.
134+ sub vcl_error {
135+ # Redirect to some other URL in the case of a homepage failure.
136+ #if (req.url ~ "^/?$") {
137+ # set obj.status = 302;
138+ # set obj.http.Location = "http://backup.example.com/";
139+ #}
140+
141+ # Otherwise redirect to the homepage, which will likely be in the cache.
142+ set obj.http.Content-Type = " text/html; charset=utf-8"
143+ synthetic {"
144+ <html>
145+ <head>
146+ <title>Page Unavailable</title>
147+ <style>
148+ body { background: #303030; text-align: center; color: white; }
149+ #page { border: 1px solid #CCC; width: 500px; margin: 100px auto 0; padding: 30px; background: #323232; }
150+ a, a:link, a:visited { color: #CCC; }
151+ .error { color: #222; }
152+ </style>
153+ </head>
154+ <body onload="setTimeout(function() { window.location = '/' }, 5000)">
155+ <div id="page">
156+ <h1 class="title">Page Unavailable</h1>
157+ <p>The page you requested is temporarily unavailable.</p>
158+ <p>We're redirecting you to the <a href="/">homepage</a> in 5 seconds.</p>
159+ <div class="error">(Error "} + obj.status + " " obj.response + {" )</div>
160+ </div>
161+ </body>
162+ </html>
163+ "}
164+ return (deliver );
165+ }
166+
167+ sub vcl_deliver {
168+ if (obj.hits > 0 ) {
169+ set resp.http.V-Cache = " HIT"
170+ } else {
171+ set resp.http.V-Cache = " MISS"
172+ }
173+ }
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