[Box-Admins] For information - possible squeaksource.com issue

[Levente Uzonyi]

On Mon, 11 Nov 2013, Frank Shearar wrote:

> So xpra is like screen, only for an X session?

Yes. Older versions (like the one which is available on box3 as a 
prebuilt package) don't support shared sessions, but that's not a problem 
for us.


Levente

>
> frank
>
> On 11 Nov 2013, at 7:59, Levente Uzonyi <leves at elte.hu> wrote:
>
>> On Sun, 10 Nov 2013, David T. Lewis wrote:
>>
>>> For information - no action required:
>>>
>>> Our squeaksource.com service is running with no apparent problems, but
>>> there is a possibility of problems arising in the next day, so I am
>>> sending this for information.
>>>
>>> I checked our squeaksource.com image on box3 via VNC about an hour ago,
>>> and noticed an error notifier related to startup processing following
>>> an image save. The error was related to port 8888 already in use. I
>>> closed the notifier, then found that http://squeaksource.com was no
>>> longer active.  I made a backup copy of the most recently saved disk
>>> image (in a BACKUPS subdirectory), then saved the image and restarted
>>> it.
>>>
>>> Squeaksource.com is running normally, but VNC access is no longer
>>> working. This means that something failed in the startup processing,
>>> and this may lead to problems later on. It also means that it is
>>> hard to debug, because I no longer have VNC access.
>>>
>>> I cannot do anything further tonight, but will follow up tomorrow
>>> to correct the problem.
>>
>> It would be worth installing xpra[1][2], and starting the image with it. IIRC the box has debian installed on it, so the following steps should work:
>>
>>
>> On the server:
>>
>> Installation:
>> $ sudo apt-get install xpra
>>
>> Start xpra on display #100:
>> $ xpra start :100
>>
>> Start the VM (this might have to be different on the server):
>> $ DISPLAY=:100 squeak -vm-sound-null squeaksource.image
>>
>>
>> On your machine:
>>
>> Once you have xpra installed, you can attach to squeak running on the server via ssh:
>>
>> $ xpra attach --encoding=jpeg --auto-refresh-delay=0.1 ssh:box3:100
>>
>> Here box3 is the label defined in the ssh config file, which can usually be found in $HOME/.ssh/config
>> If you don't have such entry or file yet, then the following will do the trick:
>>
>> Host box3
>>     hostname box3.squeak.org
>>     user <your_username>
>>     compression yes
>>     port 22
>>
>> You might want to use a different value for the --auto-refresh-delay parameter.
>>
>> To detach from the image - but keep it running on the server - simply stop the xpra on your machine with Ctrl-C.
>>
>>
>> Levente
>>
>> [1] http://xpra.org/
>> [2] https://help.ubuntu.com/community/Xpra
>>
>>>
>>> Dave
>>>
>>>
>