Entire application used to check proxy server statuses.
git clone https://github.com/Athlon1600/azenv.git
cd azenv
curl -sSL https://get.docker.com/ | sh
docker compose up --build -d
systemctl status php7.4-fpm.service
ab -n 15000 -c 500 http://azenv.net/test
ulimit -n
now shows 65536 instead of 1024 = and no problems now