[chef] Re: best way to run something only once?

["Julian C. Dunn" < >]

Another commonly-used option, rather than writing random garbage to
the filesystem, is to persist some flag in the node object itself
using "set" (one of the few instances in which set/normal is actually
desirable). Example:

https://github.com/hw-cookbooks/postgresql/blob/develop/recipes/server.rb#L47

- Julian

On Wed, Jun 18, 2014 at 3:34 PM, Tomasz Chmielewski 
<
 >
 wrote:
> Does chef have some built-in way to run some recipes (or parts of it)
> once only?
>
> Say, I have the following (here, bash snippet, but could be anything):
>
> bash 'adjust-supervisor' do
>   code <<-EOF
>      ...some_code...
>   EOF
> end
>
>
> How would you approach to make sure it only runs once?
>
> I figured I could use something like this in the recipe:
>
>    not_if { ::File.exists?("/etc/chef/stamps/some-description.stamp") }
>
> followed by:
>
> file "/etc/chef/stamps/some-description.stamp" do
>   owner "root"
>   group "root"
>   mode "0644"
>   action :create
> end
>
>
> It allows me to easily re-run by removing the stamp file, if needed.
>
>
> But not sure it's the optimal way to make sure we run a given thing
> once.
>
> How do you approach this?
>
>
>
>
> --
> Tomasz Chmielewski
> http://www.sslrack.com



-- 
[ Julian C. Dunn 
<
 >
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