#692 - select_session offers offline servers to X2Go Client

X2Go Bug report logs - #692
select_session offers offline servers to X2Go Client

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

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

Severity: wishlist

Tags: pending

Found in version 0.0.3.0-preview

Fixed in version 0.0.3.0

Done: X2Go Release Manager <git-admin@x2go.org>

Bug is archived. No further changes may be made.

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Subject: Bug#684: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client
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Date: Sun, 7 Dec 2014 03:45:28 +0400 (MSK)
From: Sergey Savko <savko@tophouse.ru>
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 684@bugs.x2go.org
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Thread-Topic: Bug#684: select_session offers offline servers to X2Go Client
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If the server will give the address to which it can not connect, there will be no load balancing works. Since the server is connected to receive the coefficient of loading. ----- Исходное сообщение ----- От: "Mike Gabriel" <mike.gabriel@das-netzwerkteam.de> Кому: "Sergey Savko" <savko@tophouse.ru>, 684@bugs.x2go.org Отправленные: Воскресенье, 7 Декабрь 2014 г 1:56:05 Тема: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client 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 - #692 select_session offers offline servers to X2Go Client

X2Go Bug report logs - #692
select_session offers offline servers to X2Go Client