Dear Ebert, I'm sure it can be possible to do with any linux too, f5 is a
expensive solution based in Linux anyway ;)
Have a look in google, I have been tinkering at google and found this
https://github.com/ivoronin/check-tcp-syn/blob/master/check_tcp_syn
This one or something similar can help you, anyway I think nmap is the trick
Regards
2016-04-14 15:00 GMT+02:00 Ebert, Matthias <matthias.eb...@siemens.com>:
> Hello Emilio
>
> Thank you for your fast response.
>
> Unfortunately, with the nmap command the application logs the following
> error:
>
> 14:57:28 Cannot execute the operation 'WSASend[4]': Error code: 0: The
> operation completed successfully.
>
>
>
> Something is still different to the “tcp_half_open” check of F5 Networks.
>
>
>
> Best regards,
>
> Matthias
>
>
>
> *Von:* Emilio Campos [mailto:emilio.campos.mar...@gmail.com]
> *Gesendet:* Donnerstag, 14. April 2016 12:21
> *An:* zenloadbalancer-support@lists.sourceforge.net
> *Betreff:* Re: [Zenloadbalancer-support] tcp_half_open check with
> FarmGuardian
>
>
>
> have you tried with nmap? something like this:
>
>
>
> nmap -sS <IP_BACKEND> -p <PORT_BACKEND> | grep open
>
>
>
> echo $? = 0 in my case.
>
>
>
> In case you want to integrate with Farmguardian, you have to create your
> own script in /usr/local/zenloadbalancer/app/libexec/, here some example:
>
>
>
>
> http://www.zenloadbalancer.com/knowledge-base/howtos/farmguardian-quick-start-configuration/
>
>
>
> Regards!
>
>
>
> 2016-04-14 11:28 GMT+02:00 Ebert, Matthias <matthias.eb...@siemens.com>:
>
> Hello community
>
> We are trying to use FarmGuardian to check for an open port on our backend
> servers.
>
> We are using this command:
>
> check_tcp -H HOST -p 5085
>
>
>
> Unfortunately, this check is flooding the log file of the application that
> is listening on that port with the following error:
>
> 16:32:04 Cannot execute the operation 'WSARecv1()' on session 72228:
> WSAECONNABORTED: An established connection was aborted by the software in
> your host machine.
>
>
>
> I already did some tests to do a so called “tcp_half_open” check, which is
> available on the F5 Networks load balancer, but I cannot get it work with
> the ZEN load balancer.
>
>
>
> Does somebody have a hint, how to write a plugin for FarmGuardian to do a
> “tcp_half_open” check?
>
>
>
> Thank you very much in advance.
>
>
>
> Best regards,
>
> Matthias
>
>
>
>
>
>
>
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