Wordpress Caching with Nginx FastCGI

config.md

These instructions allow you to setup basic Nginx FastCGI caching for Wordpress. It ensures all admin users, and non-GET requests, bypass the cache.

Create directories with the following commands:

mkdir -p /var/cache/nginxfastcgi
chown www-data: /var/cache/nginxfastcgi

Add the following to the main server blockin your site's .conf file:

fastcgi_cache_key $scheme$request_method$host$request_uri;
fastcgi_cache_lock on;
fastcgi_cache_use_stale error timeout invalid_header updating http_500;
fastcgi_cache_valid 1m;
fastcgi_ignore_headers Cache-Control Expires Set-Cookie;

set $skip_cache 0;

# POST requests and urls with a query string should always go to PHP
if ($request_method = POST) {
        set $skip_cache 1;
}
# Query parameters always go to PHP
if ($query_string != "") {
        set $skip_cache 1;
}
# Don't cache uris containing the following segments
if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml") {
        set $skip_cache 1;
}
# Don't use the cache for logged in users or recent commenters
if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
        set $skip_cache 1;
}

Add the following to the FastCGI block in your site's .conf file:

        add_header X-Cache $upstream_cache_status;
        fastcgi_cache Wordpress;
        fastcgi_cache_bypass $skip_cache;
        fastcgi_no_cache $skip_cache;

Added the following to the HTTP Block in your main nginx.conf file:

fastcgi_cache_path /var/cache/nginxfastcgi levels=1:2 keys_zone=Wordpress:1m inactive=1m max_size=64m;