Puppet users - Oct 2012 - Looking for a way to balance the contents of services (like DNS, LDAP, NIS)

I''m looking for a way to balance out services when insuring the content
of
configuration files.

Example is how to do this with /etc/yp.conf:
##
domain example.com server 192.168.1.2
domain example.com server 192.168.1.3
domain example.com server 192.168.1.4
##

I''d like to *change the order of the entries *in a random or rotating 
fashion so that multiple machines would get a *different *order so that we 
can scale the services without having to invest in a load balancer.

Obviously, we wouldn''t want the contents to continually change on every
machine, so the tests would need to be appropriate.

Any ideas?

Thanks.

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On Wednesday, October 10, 2012 11:10:32 AM UTC-5, trevman
wrote:
>
> I''m looking for a way to balance out services when insuring the
content of
> configuration files.
>
> Example is how to do this with /etc/yp.conf:
> ##
> domain example.com server 192.168.1.2
> domain example.com server 192.168.1.3
> domain example.com server 192.168.1.4
> ##
>
> I''d like to *change the order of the entries *in a random or
rotating
> fashion so that multiple machines would get a *different *order so that 
> we can scale the services without having to invest in a load balancer.
>
> Obviously, we wouldn''t want the contents to continually change on
every
> machine, so the tests would need to be appropriate.
>
> Any ideas?
>
>
There are lots of ways you could do this, but the the ready-built 
fqdn_rotate() function in Puppetlabs''s add-in "stdlib" module
(https://github.com/puppetlabs/puppetlabs-stdlib) would probably serve as a 
good foundation.  Put the NIS server IPs in an array, shuffle it with 
fqdn_rand(), and read the results out into your yp.conf template.  Each 
node will have a consistent order as long as its FQDN does not change.


John

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I''ll check out the library and the fdqn_rotate function. 

Thanks. 


On Wednesday, October 10, 2012 12:55:21 PM UTC-7, jcbollinger
wrote:
>
>
>
> On Wednesday, October 10, 2012 11:10:32 AM UTC-5, trevman wrote:
>>
>> I''m looking for a way to balance out services when insuring
the content
>> of configuration files.
>>
>> Example is how to do this with /etc/yp.conf:
>> ##
>> domain example.com server 192.168.1.2
>> domain example.com server 192.168.1.3
>> domain example.com server 192.168.1.4
>> ##
>>
>> I''d like to *change the order of the entries *in a random or
rotating
>> fashion so that multiple machines would get a *different *order so that
>> we can scale the services without having to invest in a load balancer.
>>
>> Obviously, we wouldn''t want the contents to continually change
on every
>> machine, so the tests would need to be appropriate.
>>
>> Any ideas?
>>
>>
> There are lots of ways you could do this, but the the ready-built 
> fqdn_rotate() function in Puppetlabs''s add-in "stdlib"
module (
> https://github.com/puppetlabs/puppetlabs-stdlib) would probably serve as 
> a good foundation.  Put the NIS server IPs in an array, shuffle it with 
> fqdn_rand(), and read the results out into your yp.conf template.  Each 
> node will have a consistent order as long as its FQDN does not change.
>
>
> John
>
>
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