Varnish 4.x Configuration
Last updated on
1 September 2017
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Backends
In the main section of your VCL:
import directors;
backend sitea {
.host = "xxx.xx.xxx.103";
.port = "8080";
}
backend siteb {
.host = "xxx.xx.xxx.104";
.port = "8080";
}
# Define the director that determines how to distribute incoming requests.
sub vcl_init {
new bar = directors.fallback();
bar.add_backend(sitea);
bar.add_backend(siteb);
}
See also How to configure polling.
And in sub vcl_recv:
set req.backend_hint = bar.backend();
# Do not cache these paths.
if (req.url ~ "^/status\.php$" ||
req.url ~ "^/update\.php" ||
req.url ~ "^/install\.php" ||
req.url ~ "^/apc\.php$" ||
req.url ~ "^/admin" ||
req.url ~ "^/admin/.*$" ||
req.url ~ "^/user" ||
req.url ~ "^/user/.*$" ||
req.url ~ "^/users/.*$" ||
req.url ~ "^/info/.*$" ||
req.url ~ "^/flag/.*$" ||
req.url ~ "^.*/ajax/.*$" ||
req.url ~ "^.*/ahah/.*$" ||
req.url ~ "^/system/files/.*$") {
return (pass);
}
# Always cache the following file types for all users. This list of extensions
# appears twice, once here and again in vcl_backend_response so make sure you edit both
# and keep them equal.
if (req.url ~ "(?i)\.(pdf|asc|dat|txt|doc|xls|ppt|tgz|csv|png|gif|jpeg|jpg|ico|swf|css|js)(\?.*)?$") {
unset req.http.Cookie;
}
# Remove all cookies that Drupal doesn't need to know about. We explicitly
# list the ones that Drupal does need, the SESS and NO_CACHE. If, after
# running this code we find that either of these two cookies remains, we
# will pass as the page cannot be cached.
if (req.http.Cookie) {
# 1. Append a semi-colon to the front of the cookie string.
# 2. Remove all spaces that appear after semi-colons.
# 3. Match the cookies we want to keep, adding the space we removed
# previously back. (\1) is first matching group in the regsuball.
# 4. Remove all other cookies, identifying them by the fact that they have
# no space after the preceding semi-colon.
# 5. Remove all spaces and semi-colons from the beginning and end of the
# cookie string.
set req.http.Cookie = ";" + req.http.Cookie;
set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
set req.http.Cookie = regsuball(req.http.Cookie, ";(SESS[a-z0-9]+|SSESS[a-z0-9]+|NO_CACHE)=", "; \1=");
set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
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 is any cookies left (a session or NO_CACHE cookie), do not
# cache the page. Pass it on to Apache directly.
return (pass);
}
}
Purge
near top, right after backend section:
acl purge {
"localhost";
"127.0.0.1";
}
in vcl_recv section:
# Check the incoming request type is "PURGE", not "GET" or "POST".
if (req.method == "PURGE") {
# Check if the IP is allowed.
if (!client.ip ~ purge) {
# Return error code 405 (Forbidden) when not.
return (synth(405, "Not allowed."));
}
return (purge);
}
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