I want to rate limit PHP requests with "client ip + vhost + same url" but on same servers sometimes I see:

[alert] 78841#0: could not allocate node in limit_req zone "req_limit_per_ip_per_uri"

which causes 429 errors in all domains.

-----

FreeBSD/amd64

-----

# Max connections

events {
worker_connections 16384;
}

# Rate limit

limit_req_zone "$binary_remote_addr$host$request_uri" zone=req_limit_per_ip_per_uri:10m rate=2r/s;

# Vhosts

server {

server_name www.example1.com;
...
location ~ [^/]\.php(/|$) {
...
limit_req zone=req_limit_per_ip_per_uri burst=20 nodelay;
...
}
...
}

server {

server_name www.example2.com;
...
location ~ [^/]\.php(/|$) {
...
limit_req zone=req_limit_per_ip_per_uri burst=20 nodelay;
...
}
...
}

----

Ιs it better to use different variables for key? Which is the max shared memory needed?
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