High memory usage

J.R. themadbeaker at gmail.com
Sun Oct 27 17:40:06 UTC 2019

Few things...

brotli_comp_level  should probably be something like 5, setting to 9
would be rather CPU intensive (much more than gzip 9).

Some of your proxy buffer settings seem rather excessive... Something
like this would probably be sufficient unless you have some *really*
large files coming from upstream.

proxy_buffer_size       8k;
proxy_busy_buffers_size 16k;
proxy_buffers           64 4k

A good read for proxy settings that I've found is:

You should set your SSL settings at the 'http' level, including
default certificates. Then in each 'server' directive you can
re-define the certificates when necessary.

You can also set all the common proxy_set_header vars at the 'http'
level instead of duplicating for each server. Maybe also look into
using a common upstream zone instead of always defining the proxy.

Finally, just because I would check your PHP-FPM settings (not in
nginx)... Make sure that at the very least:

pm = ondemand
pm.max_request = 1000

I've seen at times where not setting a max_request leads to eating up
ram in Apache, could possibly be an issue with Nginx.

Nothing else really stands out. I would just try to decrease buffers
where you can, especially those that are created for each server
instance. With all the vhosts you have that can really add up quickly.


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