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Nginx with wordpress refused varnish static content requests

Posted by tangrufus 
Nginx with wordpress refused varnish static content requests
April 17, 2014 09:22PM
I just added another wordpress site to my ubuntu server. 2 wordpress sites, not multisite.

They use 2 different fpm pool with same config. Their Nginx config files are basically identical except the fpm socket name and listen to different ip ports.

Site A works perfectly as usual. Site B ( the newly install one, fresh install ) gives 503 error for all the static files, e.g.: js, css, png, etc

Php and Nginx error logs show no error for this issue.

Conformed that varnish and nginx is connected to each others( at least for php ). In fact, Site B could show the wordpress hello world blog post. Confirmed that varnish did make a request to the correct nginx backend.

While stopping varnish and use nginx alone. Site B works perfectly with all static content loaded !! However, static files still give 503 errors after turning varnish back on.

Please help.



$curl 127.0.0.1:80/robots.txt
// return correct files from site A


$curl 127.0.0.2:80/robots.txt
// return 503

$ sudo netstat -anp | grep varnish
[sudo] password for tangrufus:
tcp 0 0 127.0.0.1:6082 0.0.0.0:* LISTEN 1765/varnishd
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1766/varnishd
tcp 0 0 127.0.0.1:46727 127.0.0.2:8080 ESTABLISHED 1766/varnishd
tcp 0 0 127.0.0.1:33175 127.0.0.1:8080 ESTABLISHED 1766/varnishd
tcp6 0 0 :::80 :::* LISTEN 1766/varnishd
unix 2 [ ] DGRAM 11594 1765/varnishd

$ sudo netstat -anp | grep nginx
tcp 0 0 127.0.0.2:8080 0.0.0.0:* LISTEN 1960/nginx
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 1960/nginx
tcp 0 0 127.0.0.1:8080 127.0.0.1:33240 ESTABLISHED 1963/nginx: worker
unix 3 [ ] STREAM CONNECTED 12812 1960/nginx
unix 3 [ ] STREAM CONNECTED 12811 1960/nginx



server {
// Default server block blacklisting all unconfigured access
listen 127.0.0.2:8080 default_server;
server_name _;
return 444;
}

server {
// Configure the domain that will run WordPress
server_name siteB.com image.siteB.com 127.0.0.2;
listen 127.0.0.2:8080 deferred;

error_log /var/log/nginx/siteB.com.error.log;
access_log /var/log/nginx/siteB.com.access.log;


// WordPress needs to be in the webroot of /var/www/ in this case
root /var/www/siteB.com/htdocs;

// pass PHP scripts to Fastcgi listening on Unix socket
// Do not process them if inside WP uploads directory
// If using Multisite or a custom uploads directory,
// please set the */uploads/* directory in the regex below
location ~* (^(?!(?:(?!(php|inc)).)*/uploads/).*?(php)) {
try_files $uri = 404;
fastcgi_split_path_info ^(.+.php)(.*)$;
fastcgi_pass unix:/var/run/siteB.php5-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
fastcgi_intercept_errors on;
fastcgi_ignore_client_abort off;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
}

location ^~ /nocache/ {
fastcgi_pass unix:/var/run/tangr.php5-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
access_log off;
allow 127.0.0.1;
allow 127.0.0.2;
deny all;
}

location ^~ /nocache/fpm_status {
access_log off;
include fastcgi_params;
fastcgi_pass unix:/var/run/siteB.php5-fpm.sock;
}


include sites-available/global/common.conf;
}

// Redirect all www. queries to non-www
// Change in case your site is to be available at "www.yourdomain.tld"
server {
listen 127.0.0.2:8080;
server_name www.siteB.com;
rewrite ^ $scheme://siteB.com$request_uri? permanent;
}
Varnish Config:
import std;
include "lib/xforward.vcl";
include "lib/cloudflare.vcl";
include "lib/purge.vcl";
include "lib/bigfiles.vcl"; // Varnish 3.0.3+
//include "lib/bigfiles_pipe.vcl"; // Varnish 3.0.2
include "lib/static.vcl";

backend siteA {
.host = "127.0.0.1";
.port = "8080";
.max_connections = 250;
.connect_timeout = 4.0s;
.first_byte_timeout = 600s;
.between_bytes_timeout = 600s;
}

backend siteB {
.host = "127.0.0.2";
.port = "8080";
.max_connections = 250;
.connect_timeout = 4.0s;
.first_byte_timeout = 600s;
.between_bytes_timeout = 600s;
}

acl cloudflare {
// set this ip to your Railgun IP (if applicable)
// "1.2.3.4";
"108.162.196.62";
"108.162.197.62";
}

// Only allow purging from specific IPs
acl purge {
"localhost";
"127.0.0.1";
"127.0.0.2";
}

// Pick just one of the following:
// (or don't use either of these if your application is "adaptive")
// include "lib/mobile_cache.vcl";
// include "lib/mobile_pass.vcl";

////// WordPress-specific config //////
// This config was initially derived from the work of Donncha Ó Caoimh:
// http://ocaoimh.ie/2011/08/09/speed-up-wordpress-with-apache-and-varnish/
sub vcl_recv {
if (! req.http.Host) {
error 404 "Need a host header";
}

// Let Nginx deal with 301 www to non-www redirect
// set req.http.Host = regsub(req.http.Host, "^www\.", "");

set req.http.Host = regsub(req.http.Host, ":80$", "");

if ( req.http.host ~ "^(www\.)?siteA\.com$" ) {
set req.backend = siteA;
}
else if ( req.http.host ~ "127\.0\.0\.1$" ) {
set req.backend = siteA;
}
else if ( req.http.host ~ "^(www\.)?siteB\.com$" ) {
set req.backend = siteB;
}
else if ( req.http.host ~ "127\.0\.0\.2$" ) {
set req.backend = siteB;
}
else {
error 503 "Service Unavailable";
}

// pipe on weird http methods
if (req.request !~ "^GET|HEAD|PUT|POST|TRACE|OPTIONS|DELETE$") {
return(pipe);
}

// Handle compression correctly. Different browsers send different
// "Accept-Encoding" headers, even though they mostly support the same
// compression mechanisms. By consolidating compression headers into
// a consistent format, we reduce the cache size and get more hits.
// @see: http:// varnish.projects.linpro.no/wiki/FAQ/Compression

if (req.http.Accept-Encoding) {
if (req.http.Accept-Encoding ~ "gzip") {
// If the browser supports it, we'll use gzip.
set req.http.Accept-Encoding = "gzip";
}
else if (req.http.Accept-Encoding ~ "deflate") {
// Next, try deflate if it is supported.
set req.http.Accept-Encoding = "deflate";
}
else {
// Unknown algorithm. Remove it and send unencoded.
unset req.http.Accept-Encoding;
}
}

////// Check for reasons to bypass the cache!
// never cache anything except GET/HEAD
if (req.request != "GET" && req.request != "HEAD") {
return(pass);
}
// don't cache logged-in users or authors
if (req.http.Cookie ~ "wp-postpass_|wordpress_logged_in_|comment_author|PHPSESSID") {
return(pass);
}
// don't cache ajax requests
if (req.http.X-Requested-With == "XMLHttpRequest") {
return(pass);
}
// don't cache these special pages
if (req.url ~ "nocache|wp-admin|wp-(comments-post|login|activate|mail)\.php|bb-admin|server-status|control\.php|bb-login\.php|bb-reset-password\.php|register\.php") {
return(pass);
}

// Do not cache these paths
if (req.url ~ "^/wp-cron\.php$" ||
req.url ~ "^/xmlrpc\.php$" ||
req.url ~ "^/wp-admin/.*$" ||
req.url ~ "^/wp-includes/.*$" ||
req.url ~ "\?s=") {
return (pass);
}

////// looks like we might actually cache it!
// fix up the request
// Define the default grace period to serve cached content
if (req.backend.healthy) {
set req.grace = 30s;
} else {
set req.grace = 1h;
}

set req.url = regsub(req.url, "\?replytocom=.*$", "");

// Remove has_js, Google Analytics __*, and wooTracker cookies.
set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|has_js|wooTracker)=[^;]*", "");
set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");
if (req.http.Cookie ~ "^\s*$") {
unset req.http.Cookie;
}

return(lookup);
}

sub vcl_hash {
// Add the browser cookie only if a WordPress cookie found.
if (req.http.Cookie ~ "wp-postpass_|wordpress_logged_in_|comment_author|PHPSESSID") {
hash_data(req.http.Cookie);
}
}

sub vcl_fetch {
// remove some headers we never want to see
unset beresp.http.Server;
unset beresp.http.X-Powered-By;

// Drop any cookies WordPress tries to send back to the client.
if (!(req.url ~ "wp-(login|admin)")) {
unset beresp.http.set-cookie;
}

// make sure grace is at least 2 minutes
if (req.backend.healthy) {
set req.grace = 30s;
} else {
set req.grace = 1h;
}

// catch obvious reasons we can't cache
if (beresp.http.Set-Cookie) {
set beresp.ttl = 0s;
}

// only allow cookies to be set if we're in admin area
if( beresp.http.Set-Cookie && req.url !~ "^/wp-(login|admin)" ){
set beresp.ttl = 0s;
unset beresp.http.Set-Cookie;
}

// Varnish determined the object was not cacheable
if (beresp.ttl <= 0s) {
set beresp.http.X-Cacheable = "NO:Not Cacheable";
return(hit_for_pass);

// You don't wish to cache content for logged in users
} else if (req.http.Cookie ~ "wp-postpass_|wordpress_logged_in_|comment_author|PHPSESSID") {
set beresp.http.X-Cacheable = "NO:Got Session";
return(hit_for_pass);

You are respecting the Cache-Control=private header from the backend
} else if (beresp.http.Cache-Control ~ "private") {
set beresp.http.X-Cacheable = "NO:Cache-Control=private";
return(hit_for_pass);

// don't cache response to posted requests or those with basic auth
} else if ( req.request == "POST" || req.http.Authorization ) {
return (hit_for_pass);

// don't cache search results
} else if( req.url ~ "\?s=" ){
return (hit_for_pass);

// You are extending the lifetime of the object artificially
} else if (beresp.ttl < 300s) {
set beresp.ttl = 300s;
set beresp.grace = 300s;
set beresp.http.X-Cacheable = "YES:Forced";

// Varnish determined the object was cacheable
} else {
set beresp.http.X-Cacheable = "YES";
}

// Avoid caching error responses
if (beresp.status == 404 || beresp.status >= 500) {
set beresp.ttl = 0s;
set beresp.grace = 15s;
}

// GZip the cached content if possible
if (beresp.http.content-type ~ "text") {
set beresp.do_gzip = true;
}

// if nothing abovce matched it is now ok to cache the response
// Deliver the content
return (deliver);

}
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