manipulating facter variable

[Dennis vdM]

I'm trying to manipulate the following facter variable:

ipaddress => 10.85.207.2

What I need is the second group of digits. If it's 84 then location is
A, but if it's 85 then location is B.
In puppet I couldn't grab this second set of digits, but maybe there
is a way?

I've already tried to make a custom fact, but my ruby knowledge is
*ahem* pretty basic.
So far I've only managed to manipulate a string with chop!, but that
really isn't the way.
Regular expressions in Ruby are a bit of a mystery to me....

Ideas anyone?

[Mohit Chawla]

Split & Join inside an inline template should work well. 

For eg.,

$nsip=inline_template('<%= ipaddress.split(".")[0..1].collect{|x| x}.join(".") %>')

This will split an ip address, say 192.168.1.3, split it at each occurrence of a "." and will join the first two numbers ( referenced as [0..1] ), to give 192.168.

So, in your case, I guess something like <%= ipaddress.split(".")[1] %> should work.

 

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[Dennis vdM]

THNX! Just what I needed ;-)

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[Rob Terhaar]

I think the bigger question is, what problem are you trying solve with this?

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[Matt Wallace]

We use the KSMETA section of Cobbler and a custom fact script (which I've
uploaded at http://tinyurl.com/368hccf ) to pull the data from this field.

This approach means that we can create arbitrary key->value pairs that we can
use as custom facts.

As an example, we currently have the following custom facts available to us
through this method:

datacentre
dc_rack
dc_suite
dc_room
mysql_master

and a few others including which databases are replicated by a given host etc.

It's a lot easier than trying to split out IP Addresses etc and because KSMETA
isn't hard-coded on build, it means that we can update these values when a
server is moved etc.

Hope this is of some help, I know it's not exactly what you're trying to do
but it may be a worthwhile alternative.

Kind regards,

Matt

[Nigel Kersten]

On Thu, Oct 14, 2010 at 7:18 AM, Mohit Chawla
<mohit.cha...@gmail.com> wrote:
> Split & Join inside an inline template should work well.

Wouldn't it be a bit cleaner to use the builtin regsubst function?

http://docs.puppetlabs.com/references/latest/function.html#regsubst

"Example:

Get the third octet from the node’s IP address:

$i3 = regsubst($ipaddress,'^([0-9]+)[.]([0-9]+)[.]([0-9]+)[.]([0-9]+)$','\3')"

I really try to avoid inline_template unless I absolutely have to,
even though the actual Ruby code there is cleaner than the long regex.
If you really only want the third octet, you could use a much simpler
regex than the one above.

Obligatory plug for the site I always use for regex references:
http://www.regular-expressions.info as it's an easy domain name to
remember.

[Mohit Chawla]

Hi Nigel,

Thanks for pointing that out, I wasn't aware of regsubst. But, just for my curiosity, what are the disadvantages of using an inline template, in such ( trivial ? ) cases ? Would be nice to know.

Thanks.

[Nigel Kersten]

On Thu, Oct 14, 2010 at 9:48 AM, Mohit Chawla

I just find them less readable. those nasty angle brackets have sharp edges :)

It's probably a personal preference, but I try to only resort to
inline_template if I can't achieve what I need in a reasonable manner
without it, and will often write a function instead of using
inline_template if that's an option.

[Justin Brehm]

There's a split function in Puppet's DSL as well. If you don't want
to do the inline_template() route.

http://docs.puppetlabs.com/references/stable/function.html#split

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