redis_cache + conditional purging + (optional) Domain-Mapping

easyengine (ee) note: If you are using easyengine, you can accomplish everything in this article using following command:

ee site create example.com --wpsubdir --wpredis

This article is an extension of the previous article  WordPress + Nginx + Redis cache.

Please read that article to check if Nginx is compiled with necessary modules to start caching on redis, and help on installing Nginx Helper plugin.

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WordPress-Multisite (Subdirectories) + Nginx + redis cache

Make changes to /etc/nginx/sites-available/example.com file so that it looks like below:

server {
    #@DM - uncomment following line for domain mapping or you will need to add every mapped-domain to server_name list 
    #listen 80 default_server;
    server_name example.com *.example.com ;
    #@DM - uncomment following line for domain mapping
    #server_name_in_redirect off;

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

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root /var/www/example.com/htdocs; index index.php; #redis cache start set $skip_cache 0; # POST requests and urls with a query string should always go to PHP if ($request_method = POST) { set $skip_cache 1; } if ($query_string != "") { set $skip_cache 1; } # Don't cache uris containing the following segments if ($request_uri ~* "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(_index)?.xml|[a-z0-9_-]+-sitemap([0-9]+)?.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; }
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if (!-e $request_filename) { rewrite /wp-admin$ $scheme://$host$uri/ permanent; rewrite ^(/[^/]+)?(/wp-.*) $2 last; rewrite ^/[^/]+(/.*.php)$ $1 last; } location / { try_files $uri $uri/ /index.php?$args; } location /redis-fetch { internal ; set $redis_key $args; redis_pass 127.0.0.1:6379; } location /redis-store { internal ; set_unescape_uri $key $arg_key ; redis2_query set $key $echo_request_body; redis2_query expire $key 6h; redis2_pass 127.0.0.1:6379; } location ~ \.php$ {
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set $key "nginx-cache:$scheme$request_method$host$request_uri"; try_files $uri =404; srcache_fetch_skip $skip_cache; srcache_store_skip $skip_cache; srcache_response_cache_control off; set_escape_uri $escaped_key $key; srcache_fetch GET /redis-fetch $key; srcache_store PUT /redis-store key=$escaped_key;
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more_set_headers 'X-Cache $srcache_fetch_status'; more_set_headers 'X-Cache-2 $srcache_store_status'; include fastcgi_params; fastcgi_pass php; } location ~* ^.+.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ { access_log off; log_not_found off; expires max; } location = /robots.txt { access_log off; log_not_found off; } location ~ /. { deny all; access_log off; log_not_found off; } }

Save above configuration. Test and reload Nginx configuration with following commands

nginx -t && service nginx reload

Domain Mapping

You need to uncomment few lines in above nginx-config to get domain mapping working. Apart from above config changes, you can read this guide to setup/configure domain-mapping.

Links: Nginx-Helper Plugin | EasyEngine

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