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The stack is Varnish, Memcached, PHP-FPM and optionally Redis Cache Pro which is currently not active.
I’m just wondering if there’s a need to install a caching plugin on the application level (wordpress) when I have all these on the server level. Soon we will start using Cloudflare enterprise to serve all static files and cache things to.
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The cache plugin job is generally to clear a pice of cached item when it detects a change.
For example. If you edit a page. When you press save wordpress will trigger a save page hook. The plugin will then remove that page from the cache
yes you do! your wordpress site has to talk to the varnish server via a plugin to read/write the cache.
No reason not to have Redis set up and after all that I would still recommend wp-rocket for page cache.