#690 - request another server from broker provided server is down

X2Go Bug report logs - #690
request another server from broker provided server is down

Reported by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Date: Tue, 2 Dec 2014 12:35:01 UTC

Severity: wishlist

Fix blocked by 684: add exclude-hosts parameter to selectsession task

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Date: Sat, 06 Dec 2014 22:56:05 +0000
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From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Sergey Savko <savko@tophouse.ru>, 684@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to
 X2Go Client
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Control: clone -1 -2 -3 Control: reassign -2 x2goclient Control: reassign -3 python-x2go Control: retitle -1 add exclude-hosts parameter to selectsession task Control: retitle -2 request another server from broker provided server is down Control: retitle -3 request another server from broker provided server is down Control: severity -1 wishlist Control: severity -2 wishlist Control: severity -3 wishlist Control: block -2 by -1 Control: block -3 by -1 Control: tag -1 - patch Hi Sergey, On Fr 05 Dez 2014 17:14:51 CET, Sergey Savko wrote: > This patch work after patch from > http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=686 After thinking this through a little, I come to the conclusion that the broker cannot decide if a machine is down or not. We have to think very generically. There may be a scenario where the broker machine may be on an network segment where it cannot ping/reach the X2Go Servers. The X2Go Clients can reach the X2Go Broker. The broker provides an X2Go Server address on the "selectsession" broker task to the X2Go Client. Then the X2Go Client should test if that X2Go Server address works (via a simple ping6/ping command, machines should always be pingable!!!). If the ping fails, X2Go Client should go back to the broker and say: hey, that server failed for me, give me another one (but not the one you already gave me). I fear we need to do four things for this bug to get fixed: 1. extend broker/client communication protocol (second/third/... selectsession call with a list of hosts that did not work on previous attempts) 2. extend X2Go Session Broker with an exclude-hosts (or so) parameter for the selectsession task 3. Adapt X2Go Client: ping X2Go Server, go back to the broker if server is down and request another server 4. Adapt Python X2Go: dito Regards, Mike -- DAS-NETZWERKTEAM mike gabriel, herweg 7, 24357 fleckeby fon: +49 (1520) 1976 148 GnuPG Key ID 0x25771B31 mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb

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X2Go Bug report logs - #690 request another server from broker provided server is down

X2Go Bug report logs - #690
request another server from broker provided server is down