Thanks, that explains why the current set of servers is not working as  
we expected.

Damon

On 7 Sep 2009, at 16:23, Nickolas Toursky wrote:

>
> Damon,
>
> No, just those based on the 'application' roles (app, app-tomcat,  
> app-rails).
>
> Nick
>
> 2009/9/7 [email protected] <[email protected]>:
>> Hi Nick,
>>
>> Just for clarity, does 'app-derived instances' include those based  
>> on the
>> 'mysql database' role?
>>
>> Thanks
>> Damon
>>
>> On 07 September 2009 at 16:46 Nickolas Toursky <[email protected]>  
>> wrote:
>>
>>>
>>> Frederic,
>>>
>>> /etc/nginx/app-servers.include is the only file that contains  
>>> upstreams
>>> list.
>>>
>>> /etc/nginx/https.include is updated while SSL-enabled virtual hosts
>>> configuration (if any).
>>>
>>> Nick
>>>
>>>
>>> 2009/9/7 Frederic Sidler <[email protected]>:
>>>>
>>>> Nick
>>>>
>>>> Is this the only file that is updated?
>>>>
>>>> Envoyé de mon iPhone
>>>>
>>>>
>>>> On 7 sept. 2009, at 16:33, Nickolas Toursky <[email protected]>  
>>>> wrote:
>>>>
>>>>>
>>>>> Damon,
>>>>>
>>>>> There are scripts under /usr/local/aws/, which handle instance
>>>>> initialization and configuration updates.
>>>>>
>>>>> During www instance initialization, all app-derived instances are
>>>>> added to nginx upstreams list. When the new instance is up, it is
>>>>> added to this list. When instance is terminated, it is removed  
>>>>> from
>>>>> this list.
>>>>>
>>>>> Nick
>>>>>
>>>>> 2009/9/7 damonjebb <[email protected]>:
>>>>>>
>>>>>> I am interested to understand the behaviour of a machine based  
>>>>>> on the
>>>>>> default scalr www role.  Are there scripts that will, by default,
>>>>>> update the configuration of nginx to ensure it has the correct
>>>>>> settings for load balancing to the slave machines?  If so, what  
>>>>>> do
>>>>>> they do and under what circumstances are they triggered?
>>>>>>
>>>>>> If not, are there examples of how one can successfully script the
>>>>>> management of the load balancer and its understanding of the  
>>>>>> other
>>>>>> members of the farm?
>>>>>>
>>>>>> Thanks
>>>>>> Damon
>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>>
>>>>
>>>>>
>>>>
>>>
>>>>
>>
>>>
>>
>
> >


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