You can enable caching for your site by changing the cache settings under each site key. Using caching provides substantial speed improvement once pages are cached. The full settings looks like this:
cache: enabled: false duration: 30s skip_cache_uri: /wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml skip_cache_cookie: comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in
duration parameter control how long your pages will stay in the cache. You should generally keep this value low (the default is 30 seconds), unless your content doesn't change frequently. Lowering the duration to
1s will make the cache more like a DDOS protection; meaning that if you have a sudden spike of traffic, only one request will hit the back-end per second instead of the full load. The whole setup is "micro-cache" oriented, so there is no means of flushing the cache.
skip_cache_uri is a regex that will be used to tell Nginx not cache pages matching it. Use it if you have sections of your site that you don't want cached (like shopping carts). Override the global
group_vars/all/main.yml or override
cache to vary it per WordPress site. The default value is shown above.
skip_cache_cookie is a regex that will disable the cache when a cookie match it. Useful for disabling the cache for certain users.
Already cached content will continue be served if your back-end (PHP-FPM) go down.