I have a setup which was working on Varnish 3.0 but not with 4.1
The stale pages where servered in case the backends where sick. But I
cannot make this work with varnish 4.
Can you help me to make it serve the cached pages in case backends are gone?
also session-cookies can be removed/ignored
My config is:
vcl 4.0;
import directors;
import std;
backend b1 {
.host =
.port = "80";
.first_byte_timeout = 180s;
.between_bytes_timeout = 120s;
.probe = {
.url = "/healthy_check/d.php";
.interval = 10s;
.timeout = 2 s;
.window = 7;
.threshold = 1;
}
}
backend b2 {
.host =
.port = "80";
.first_byte_timeout = 180s;
.between_bytes_timeout = 120s;
.probe = {
.url = "/healthy_check/d.php";
.interval = 10s;
.timeout = 2 s;
.window = 7;
.threshold = 1;
}
}
sub vcl_init {
new vdir = directors.round_robin();
vdir.add_backend(b1);
vdir.add_backend(b2);
}
sub vcl_recv {
set req.backend_hint = vdir.backend();
#Ignore adminpanel
if (req.url == "^/adminpanel/.*" ||
req.url == "^/adminApplication/.*" ||
req.url ~ "^/adminApplication/" ||
req.url ~ "^/adminpanel/" ||
req.url ~ "^/newsfeed.php" ||
req.url ~ "^/comment") {
return (pass); # unset req.http.Cookie;
}
if (req.method != "GET" &&
req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
if (req.method != "GET" && req.method != "HEAD") {
/* We only deal with GET and HEAD by default */
return (pass);
}
#set req.http.grace = "none";
return (hash);
}
sub vcl_pipe {
return (pipe);
}
sub vcl_pass {
return (fetch);
}
sub vcl_hit {
if (obj.ttl >= 0s) {
# normal hit
return (deliver);
}
# We have no fresh fish. Lets look at the stale ones.
if (std.healthy(req.backend_hint)) {
# Backend is healthy. Limit age to 10s.
if (obj.ttl + 10s > 0s) {
set req.http.grace = "normal(limited)";
return (deliver);
} else {
# No candidate for grace. Fetch a fresh object.
return(fetch);
}
} else {
# backend is sick - use full grace
if (obj.ttl + obj.grace > 0s) {
set req.http.grace = "full";
return (deliver);
} else {
# no graced object.
return (fetch);
}
}
}
sub vcl_miss {
return (fetch);
}
sub vcl_backend_fetch {
set bereq.backend = vdir.backend();
}
sub vcl_backend_response {
# Happens after we have read the response headers from the backend.
#
# Here you clean the response headers, removing silly Set-Cookie headers
# and other mistakes your backend does.
unset beresp.http.set-cookie; set beresp.grace = 1h;
if (beresp.status > 500) {
return (retry);
}
if (bereq.url == "^/") {
set beresp.ttl = 60s;
}
#jpeg caching (forced)
if (bereq.url ~ "\.(png|gif|PNG|JPG|JPEG|jpg|jpeg|swf|css|js)$" ||
bereq.url ~ "\.(png|gif|PNG|JPG|JPEG|jpg|jpeg)&width.*" ||
bereq.url ~ "\.(png|gif|PNG|JPG|JPEG|jpg|jpeg)?.*") {
set beresp.http.cache-control = "max-age = 2592000";
}
return (deliver);
}
sub vcl_hash {
hash_data(req.url);
if (req.http.host) {
hash_data(req.http.host);
} else {
hash_data(server.ip);
}
return (lookup);
}
sub vcl_deliver {
set resp.http.grace = req.http.grace;
}
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