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I was trying to fix the following error being logged by haproxy...

Proxy https-in reached process FD limit at 544. Please check 'ulimit-n' and restart

...and added LimitNOFILE=1024 in haproxy's systemd unit file.

However, what I"m observing is that haproxy starts-up with 1024 "max open files" (confirmed via /proc/<pid>/limit), which drops back down to 544 after a few seconds.

Two related questions:

  • where is the strange 544 limit coming from?
  • apart from LimitNOFILE in systemd's unit file, is there any other file/configuration that controls this parameter?
Saurabh Nanda
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