[chef] Re: Re: Question about recipes

[Jens Skott < >]

But if i put a action [:restart] will it restart it every time the
client parses the recipe?
If so do I have to put it in a not_if thingy to make it not restart if
there are stuff present?


Jens Skott
Tel: +46-8-5142 4396
Schibsted Centralen IT



2012/11/5 Sean OMeara 
<
 >:
> TL;DR - Chef will probably do nothing on the second run.
>
> Actual answer -
>
> Chef will parse the recipe, compiling a "resource collection" that
> looks something like:
>
> [ 'package[apache]', 'file[yourconfig]', 'service[apache]' ]
>
> Then, it will process the resources individually, in the order
> generated by the recipe. Each resource will independently check to see
> if it needs to take action to fix its subject through a provider,
> potentially changing the system as it goes.
>
> The package resource will consult the package manager to test if it
> needs to install apache.
> Think `if [rpm -qa | grep apache]` of  `if [dpkg -L | grep apache]`
> under the hood.
>
> The file resource (and its cousins template, remote_file,
> cookbook_file, etc) will take checksums in memory and against the file
> on disk. If they differ, the one in memory wins and gets written,
> leaving you a diff in your output. (logs, why-run, etc)
>
> 'service[apache]' will check to see if apache is running and fix it if
> it isn't, etc.
>
> hope that helps
>
> -s
>
> On Mon, Nov 5, 2012 at 9:02 AM, Jens Skott 
> <
 >
>  wrote:
>> I have a question about RPM:s and config files with chef.
>> Im sorry if im writing a question I should find the answer to on the
>> site but have not found any information regarding it or I could just
>> have missed it.
>>
>> The question I have is. If I write a recipe that installs a RPM
>> package trough yum, then deploys config files in specific directories
>> and then restarts the enables and starts the service. Then have a
>> dependency on apache recipe and does and action [:restart] on httpd
>> service.
>>
>> What does the chef recipe actualy do the second time chef runs? Does
>> it reinstalls the RPM and config files then restarts the httpd
>> service? Or does it do a diff to see if its the same package and skip
>> the installation and configfiles but restarts httpd?
>>
>> Anyone who can enlighten me or point me to a RTFM page? =)
>>
>> Jens Skott
>> Tel: +46-8-5142 4396
>> Schibsted Centralen IT