X2Go Bug report logs - #691
request another server from broker provided server is down

Package: python-x2go; Maintainer for python-x2go is X2Go Developers <x2go-dev@lists.x2go.org>; Source for python-x2go is src:python-x2go.

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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Report forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#684; Package python-x2gobroker. (Tue, 02 Dec 2014 12:35:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Mike Gabriel <mike.gabriel@das-netzwerkteam.de>:
New Bug report received and forwarded. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Tue, 02 Dec 2014 12:35:01 GMT) Full text and rfc822 format available.

Message #5 received at submit@bugs.x2go.org (full text, mbox):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: submit@bugs.x2go.org
Subject: select_session offers offline servers to X2Go Client
Date: Tue, 02 Dec 2014 12:33:41 +0000
[Message part 1 (text/plain, inline)]
Package: python-x2gobroker
Severity: important
Version: 0.0.3.0-preview

The X2Go Session Broker should be able to detect offline X2Go Servers.

It should not offer session via the select_session() method to X2Go  
Client, if a server is offline.

Mike

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Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#684; Package python-x2gobroker. (Fri, 05 Dec 2014 16:25:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Sergey Savko <savko@tophouse.ru>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Fri, 05 Dec 2014 16:25:01 GMT) Full text and rfc822 format available.

Message #10 received at 684@bugs.x2go.org (full text, mbox):

From: Sergey Savko <savko@tophouse.ru>
To: 684@bugs.x2go.org
Subject: select_session offers offline servers to X2Go Client
Date: Fri, 5 Dec 2014 20:14:51 +0400 (MSK)
[Message part 1 (text/plain, inline)]
This patch work after patch from http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=686

-- 
С уважением,
Сергей Савко,
начальник IT отдела.
+7-931-361-04-02
[0002-Gives-a-coefficient-of-1-for-the-server-if-the-serve.patch (text/x-patch, attachment)]

Information forwarded to x2go-dev@lists.x2go.org, X2Go Developers <x2go-dev@lists.x2go.org>:
Bug#684; Package python-x2gobroker. (Sat, 06 Dec 2014 23:00:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Mike Gabriel <mike.gabriel@das-netzwerkteam.de>:
Extra info received and forwarded to list. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>. (Sat, 06 Dec 2014 23:00:02 GMT) Full text and rfc822 format available.

Message #15 received at 684@bugs.x2go.org (full text, mbox):

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
Date: Sat, 06 Dec 2014 22:56:05 +0000
[Message part 1 (text/plain, inline)]
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
[Message part 2 (application/pgp-signature, inline)]

Bug 684 cloned as bugs 690, 691 Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

Bug reassigned from package 'python-x2gobroker' to 'python-x2go'. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

No longer marked as found in versions 0.0.3.0-preview. Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

Changed Bug title to 'request another server from broker provided server is down' from 'select_session offers offline servers to X2Go Client' Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

Severity set to 'wishlist' from 'important' Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

Added blocking bug(s) of 691: 684 Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to 684-submit@bugs.x2go.org. (Sat, 06 Dec 2014 23:00:03 GMT) Full text and rfc822 format available.

Added indication that bug 691 blocks 692 Request was from Mike Gabriel <mike.gabriel@das-netzwerkteam.de> to control@bugs.x2go.org. (Mon, 08 Dec 2014 07:25:02 GMT) Full text and rfc822 format available.

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