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CPU Usage with DNS Resolvers Bug

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@ingshtrom wrote:

Hello friends,

I found a few conversations about a bug with DNS resolvers and checks causing high CPU usage in v1.8.9, but I’m using v1.8.13 and it seems to have this same problem with CPU sitting at 100% when I have DNS resolvers enabled.

I usually use a DNS resolver in my HAProxy config, but when I take that out and then remove the backend using the dns resolver, then HAProxy correctly idles well under 5% of CPU.

Here is haproxy --v:


/ # haproxy --v

HA-Proxy version 1.8.9-83616ec 2018/05/18

Copyright 2000-2018 Willy Tarreau <[willy@haproxy.org](mailto:willy@haproxy.org)>

I am running this in a Docker container, haproxy:1.8.13.

I assume the patch discussed earlier in this thread is in v1.8.13. If it isn’t, is there an easy way for me to see if patches are in a release? What else could it be?

Here are related conversations:


https://www.mail-archive.com/haproxy@formilux.org/msg30173.html

I tried reaching out to the person who originally answered the mailing list question, but didn’t get any response. Any help is welcome!

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