[LON-CAPA-admin] Server migration

[Gerd Kortemeyer]

Hi,

It would be far preferable if the new server would inherit all  
coordinates of the new one, i.e., it becomes "polya" - doing that  
will give a seamless transition, the network does not even need to  
know that the hardware changed.

The old server should get a new name.

- Gerd.

On Jan 10, 2007, at 2:26 PM, Peter Riegler wrote:

> Hi Guy and Stefan,
>
> following your discussion I think one issue seems to be clarified:
>
> polya will be degraded to being a development machine, i.e. will  
> continue to exist at the same place, preferably with IP and DNS  
> unchanged.
>
> The new machine will serve as THE access server for the complete  
> university. Physically it will reside within the rooms of our  
> computer ressources department (There are pros and cons to that ...  
> and there are political boundary conditions ...).
>
> From my limited perspective all boils down to what will happen with  
> the resources published on polya so far.
>
> Case 1: Resources published so far are not used by anyone outside  
> Wolfenbuettel
> Will it be sufficient
> o to assign loncapa-domain "fhwf" (the one polya currently has) to  
> the new server
> o and to configure polya to be a standalone server with a different  
> loncapa-domain, after the migration has been successfully finished?
> I guess it depends on how /res/fhwf/riegler/... is mapped  
> internally to the IP-address of the server.
>
> Case 2: Resources published so far are used by someone outside  
> Wolfenbuettel
> Not sure about that one.
>
> Happy new year, by the way
>
> Peter
>
> Guy Albertelli II wrote:
>
>> Hi Stefan,
>>> Guy Albertelli II wrote:
>>>
>>>> Let me know if anything need more clarification.
>>>
>>> Thanks for your help so far.
>>>
>>>
>>>
>>>> [...]
>>>
>>> The procedure you describe seems managable for us:
>>> (in short)
>>> - Prepare new server (install, configure and test OS and LON-CAPA)
>>> - Transfer data from old to new server
>>> - Shut down/Disconnect old server
>>> - Activate new server
>> Yesish. But the details are very important.
>> And I think I'd make the summary.
>>   - Prepare new server (install, configure and test OS and LON-CAPA)
>>   - Disable lon-capa access on old server
>>   - Transfer data from old to new server
>>   - Shut down old server
>>   - "Activate" new server
>>> One question left concerning the hostname, DNS name and IP address:
>>>
>>>
>>>> * change the hostname on the new machine to the same DNS name as  
>>>> the old
>>>> * either
>>>>   - switch the IP address of the new box to be the same as the old
>>>>     (I highly suggest this one. On Fedora you can easily change  
>>>> both
>>>>      the IP and the hostname using the xwindows application
>>>>      system-config-network )
>>>>   or
>>>>   - switch the DNS entry
>>>> * run the loncapa UPDATE prcoedure, configure it to be in the
>>>>  production cluster and give it the settings you had on the old box
>>>> * reboot the new box
>>>
>>> The old server should not be seen again in the LON-CAPA cluster,  
>>> but the
>>> new one. The new server needs to have a new DNS name AND a new IP  
>>> address.
>>>
>>> Is this possible?
>> I don't suggest doing that.
>> I highly suggest doing:
>>        - install and configure new machine with any new IP adress and
>>          any new DNS name
>>        - turn off loncontrol/httpd on old server
>>        - rsync data from old to new server
>>        - turn power off from old server
>>        - change the IP address and DNS of the new server to be
>>           polya.informatik.fh-wolfenbuettel.de -> 141.41.35.155
>>        - reboot the new box
>> If anything fails in this procedure you can then just turn off the  
>> new
>> server and turn the old server back on and then figure out what needs
>> to be done differently.
>
> -- 
> Peter Riegler
> Fachhochschule Braunschweig/Wolfenbüttel
> Salzdahlumer Str. 46/48, 38302 Wolfenbüttel
> Tel. +49 5331 939 6314, Fax. +49 5331 939 6002
> email: p.riegler at fh-wolfenbuettel.de
> http://public.rz.fh-wolfenbuettel.de/~riegler
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