[colug-432] Automatically Edit Configuration File

[Greg Sidelinger]

Try the replace module.

http://docs.ansible.com/ansible/replace_module.html



On Wed, Nov 18, 2015 at 10:26 PM <jep200404 at columbus.rr.com> wrote:

> How would you automate the editing of a configuration file as
> described below?
>
> I am automating the configuration of a system with Ansible.
> For /etc/httpd/conf/httpd.conf, I need to make sure that the
> <Directory /> section has a "Require all granted" line instead
> of a "Require all denied" line. "Require all" lines in other
> sections need to be left alone.
>
> original /etc/httpd/conf/httpd.conf
>
>     ...
>     <Directory />
>         AllowOverride none
>         Require all denied
>     </Directory>
>     ...
>     <Files ".ht*">
>         Require all denied
>     </Files>
>     ...
>
> desired /etc/httpd/conf/httpd.conf
>
>     ...
>     <Directory />
>         AllowOverride none
>         Require all granted
>     </Directory>
>     ...
>     <Files ".ht*">
>         Require all denied
>     </Files>
>     ...
>
> I can write an awk script or probably even a sed script to do it,
> but it is desirable to edit with a Ansible module instead of an
> external shell command, because of the way Ansible modules
> understand when something has really changed or not.
>
> I don't see how to use the lineinfile module in this situation,
> because it will only change the last line to match a regex.
> Matching "Require all" would change the line in the <Files ".ht*">,
> section instead of in the <Directory /> section.
>
> It would be easy to just replace the whole file with a new one from
> Ansible, but that is also not preferred because when some new
> version of httpd.conf arrives, the wholesale replacement would
> clobber other changes in the configuration file.
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>
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