Is there any need to add $cookie_domain to settings.php file?

[izmeez]

Is there any need to add a $cookie_domain line in the settings.php file?
$cookie_domain = '.example.com';
As suggested in the old comment, https://www.drupal.org/project/domain/issues/1559486#comment-10176824

[izmeez]

If the $cookie_domain = '.example.com'; is added to the settings.php file the user is not logged out when the line in the settings.php to include the domain module file is commented and then uncommented, as described in #39

[izmeez]

Now that issue #39 is fixed it leaves me wondering what other benefits having the `$cookie_domain = '.example.com'; may have.

[izmeez]

This is related to issue #32.

[yorkshire-pudding]

@izmeez - I tested this:
With $cookie_domain set to primary domain, then logging in on any of the domains you are logged into all.
Without $cookie_domain set, all the logins have to be done separately.

So whether do you or not might depend on use case and whether the same users have access on all domains:

• Use case 1 - single company with multiple brand images, same people updating content and settings for all sites > set $cookie_domain
• Use case 2 - Tim's example of organisation with 2 separate branches that operate fairly autonomously and are each responsible for their own content > don't set $cookie_domain

I think the comment in settings.php is pretty clear and helpful:

/**
 * Backdrop automatically generates a unique session cookie name for each site
 * based on its full domain name. If you have multiple domains pointing at the
 * same Backdrop site, you can either redirect them all to a single domain (see
 * comment in .htaccess), or uncomment the line below and specify their shared
 * base domain. Doing so assures that users remain logged in as they cross
 * between your various domains. Make sure to always start the $cookie_domain
 * with a leading dot, as per RFC 2109.
 */
// $cookie_domain = '.example.com';

[izmeez]

@yorkshire-pudding Thanks for pointing that out. I had overlooked it being in the settings.php file by default. I am inclined to consider adding a reference to it in the domain install quickstart.