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Matt Mencel

2012-Feb-29 18:10 UTC

[Puppet Users] Modifying a FACT Value In a Manifest

In my network every subnets default gateway is X.X.X.1.  That router
gateway is always running ntpd which I want to give be default as the ntp
server in every hosts ntp.conf.

Since there is no official "default gateway" fact yet, what I want to
be
able to do in my manifest is take the $ipaddress fact and turn it into the
gateway for that subnet.

For example...
IP = 10.1.1.12
GW = 10.1.1.1

I''m using the puppetlabs-ntp module, so I should be able to do
something
like this in my classes...I think...  I just need to know how to get the .1
address in there...

class mycustomclass:ntp {
class { "ntp":
servers => [ DOT_ONE_ADDRESS_FOR_HOSTS_IP_GOES_HERE ],
autoupdate => false,
}
}

If this was raw ruby I could do some string magic to turn the last value to
1.  I don''t know how to do that with the Puppet DSL though.

Thanks,
Matt

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Kinzel, David

2012-Feb-29 18:43 UTC

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RE: [Puppet Users] Modifying a FACT Value In a Manifest

> In my network every subnets default gateway is X.X.X.1.  That router
gateway is always running ntpd which I want to give be default as the ntp server
in every hosts ntp.conf.
> Since there is no official "default gateway" fact yet, what I
want to be able to do in my manifest is take the $ipaddress fact and turn it
into the gateway for that subnet.
Something like: $router = regsubst($ipaddress, ''[0-9]+$'',
''1'')

Should replace all the last numbers of the ipaddress with simply 1.


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Peter Bukowinski

2012-Feb-29 19:01 UTC

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Re: [Puppet Users] Modifying a FACT Value In a Manifest

On Feb 29, 2012, at 1:10 PM, Matt Mencel wrote:
> In my network every subnets default gateway is X.X.X.1.  That router
gateway is always running ntpd which I want to give be default as the ntp server
in every hosts ntp.conf.
> 
> Since there is no official "default gateway" fact yet, what I
want to be able to do in my manifest is take the $ipaddress fact and turn it
into the gateway for that subnet.
> 
> For example...
> IP = 10.1.1.12
> GW = 10.1.1.1
> 
> I''m using the puppetlabs-ntp module, so I should be able to do
something like this in my classes...I think...  I just need to know how to get
the .1 address in there...
> 
> class mycustomclass:ntp {
> 	class { "ntp":
> 		servers		=> [ DOT_ONE_ADDRESS_FOR_HOSTS_IP_GOES_HERE ],
> 		autoupdate	=> false,
> 	}
> }
> 
> If this was raw ruby I could do some string magic to turn the last value to
1.  I don''t know how to do that with the Puppet DSL though.
> 
> Thanks,
> Matt
Oh, look. I get to be useful! I''ve done something similar for my
computer cluster class. I base the ip of the eth4 interface off the ip of eth0,
changing one octet from 39 to 38. Here''s the line:

    $eth4ip = regsubst($::ipaddress_eth0, ''\.39\.'',
''.38.'')

For your purpose, you''d need to do something like this:

    $ntpip =  regsubst($::ipaddress, ''[0-9]+$'',
''1'')

-- 
Peter M. Bukowinski
Sr. Systems Engineer
Janelia Farm Research Campus, HHMI

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Matt Mencel

2012-Mar-01 15:26 UTC

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Re: [Puppet Users] Modifying a FACT Value In a Manifest

Thanks to both of you... :)

Matt

------------------------------
*From: *"Peter Bukowinski" <pmbuko@gmail.com>
*To: *puppet-users@googlegroups.com
*Sent: *Wednesday, February 29, 2012 1:01:14 PM
*Subject: *Re: [Puppet Users] Modifying a FACT Value In a Manifest


On Feb 29, 2012, at 1:10 PM, Matt Mencel wrote:

In my network every subnets default gateway is X.X.X.1.  That router
gateway is always running ntpd which I want to give be default as the ntp
server in every hosts ntp.conf.

Since there is no official "default gateway" fact yet, what I want to
be
able to do in my manifest is take the $ipaddress fact and turn it into the
gateway for that subnet.

For example...
IP = 10.1.1.12
GW = 10.1.1.1

I''m using the puppetlabs-ntp module, so I should be able to do
something
like this in my classes...I think...  I just need to know how to get the .1
address in there...

class mycustomclass:ntp {
class { "ntp":
servers => [ DOT_ONE_ADDRESS_FOR_HOSTS_IP_GOES_HERE ],
autoupdate => false,
}
}

If this was raw ruby I could do some string magic to turn the last value to
1.  I don''t know how to do that with the Puppet DSL though.

Thanks,
Matt


Oh, look. I get to be useful! I''ve done something similar for my
computer
cluster class. I base the ip of the eth4 interface off the ip of eth0,
changing one octet from 39 to 38. Here''s the line:

    $eth4ip = regsubst($::ipaddress_eth0, ''\.39\.'',
''.38.'')

For your purpose, you''d need to do something like this:

    $ntpip =  regsubst($::ipaddress, ''[0-9]+$'',
''1'')

-- 
*Peter M. Bukowinski*
Sr. Systems Engineer
Janelia Farm Research Campus, HHMI

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