Puppet users - Oct 2010 - Using Augeas to manage /etc/network/interfaces from Puppet

Hi,

Sorry for the broad distribution, I''m not sure who best can help me.

I''m trying to add a new interface stanza to /etc/network/interfaces.

With augtool, I can accomplish this with the following:

set /files/etc/network/interfaces/iface[last()+1] bond1
set /files/etc/network/interfaces/iface[last()]/family inet
set /files/etc/network/interfaces/iface[last()]/method dhcp
set /files/etc/network/interfaces/iface[last()]/slaves eth2

I''ve been able to translate that to the following Puppet resource:

augeas { "bond1":
  context => "/files/etc/network/interfaces",
  changes => [
    "set iface[last()+1] bond1",
    "set iface[last()]/family inet",
    "set iface[last()]/method dhcp",
    "set iface[last()]/slaves eth2",
  ],
}

All good so far, except this will unconditionally create the interface
stanza every time Puppet runs. That''s fine, this is what the
"onlyif"
directive is for, right? I just can''t make it work.

I''m a bit hazy on how "match" works. From augtool, I can go

match /files/etc/network/interfaces/iface[*]

and sort of get back a list of interface names. I was thinking that maybe I
could do something with that, but I''m not entirely sure what.

I hear there''s some user-contributed Augeas examples in a Puppet wiki
somewhere, but I haven''t been able to find them. Any pointers
appreciated.

regards

Andrew

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On Oct 6, 2010, at 2:31 PM, Andrew Pollock wrote:
> I hear there''s some user-contributed Augeas examples in a Puppet
wiki somewhere, but I haven''t been able to find them. Any pointers
appreciated.

There is (and even I have a hard time finding it).

http://projects.puppetlabs.com/projects/puppet/wiki/Puppet_Augeas

You can usually avoid the ugly mess of using last() and onlyif, as shown in the
wiki.

-- 
Rob McBroom
<http://www.skurfer.com/>

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On Oct 6, 12:22 pm, Rob McBroom <mailingli...@skurfer.com>
wrote:
> On Oct 6, 2010, at 2:31 PM, Andrew Pollock wrote:
>
> > I hear there''s some user-contributed Augeas examples in a
Puppet wiki somewhere, but I haven''t been able to find them. Any
pointers appreciated.
>
> There is (and even I have a hard time finding it).
>
> http://projects.puppetlabs.com/projects/puppet/wiki/Puppet_Augeas
>
> You can usually avoid the ugly mess of using last() and onlyif, as shown in
the wiki.
Fabulous, thank you! For the record, I''m using


augeas { "bond1":
  context => "/files/etc/network/interfaces",
  changes => [
    "set iface[. = ''bond1''] bond1",
    "set iface[. = ''bond1'']/family inet",
    "set iface[. = ''bond1'']/method dhcp",
    "set iface[. = ''bond1'']/slaves eth2",
  ],
}

which appears to be working as desired.

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Also see this blog post:
http://www.puppetlabs.com/blog/puppets-google-summer-of-code/ which discusses
this possibly useful module: http://github.com/blkperl/puppet-network

----- Original Message -----
> From: "Andrew Pollock" <apollock@google.com>
> To: augeas-devel@redhat.com, puppet-users@googlegroups.com
> Cc: "Bryan Kearney" <bkearney@redhat.com>, "Free
Ekanayaka" <free@64studio.com>
> Sent: Wednesday, October 6, 2010 2:31:07 PM
> Subject: [Puppet Users] Using Augeas to manage /etc/network/interfaces from
Puppet
> Hi,
> 
> 
> Sorry for the broad distribution, I''m not sure who best can help
me.
> 
> 
> I''m trying to add a new interface stanza to
/etc/network/interfaces.
> 
> 
> With augtool, I can accomplish this with the following:
> 
> 
> 
> set /files/etc/network/interfaces/iface[last()+1] bond1
> set /files/etc/network/interfaces/iface[last()]/family inet
> set /files/etc/network/interfaces/iface[last()]/method dhcp
> set /files/etc/network/interfaces/iface[last()]/slaves eth2
> 
> 
> I''ve been able to translate that to the following Puppet resource:
> 
> 
> 
> augeas { "bond1":
> context => "/files/etc/network/interfaces",
> changes => [
> "set iface[last()+1] bond1",
> "set iface[last()]/family inet",
> "set iface[last()]/method dhcp",
> "set iface[last()]/slaves eth2",
> ],
> }
> 
> 
> All good so far, except this will unconditionally create the interface
> stanza every time Puppet runs. That''s fine, this is what the
"onlyif"
> directive is for, right? I just can''t make it work.
> 
> 
> I''m a bit hazy on how "match" works. From augtool, I can
go
> 
> 
> match /files/etc/network/interfaces/iface[*]
> 
> 
> and sort of get back a list of interface names. I was thinking that
> maybe I could do something with that, but I''m not entirely sure
what.
> 
> 
> I hear there''s some user-contributed Augeas examples in a Puppet
wiki
> somewhere, but I haven''t been able to find them. Any pointers
> appreciated.
> 
> 
> regards
> 
> 
> Andrew
> 
> --
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> To unsubscribe from this group, send email to
> puppet-users+unsubscribe@googlegroups.com.
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