# Specifying the site URL for a fresh install

**URL:** <https://forum.mautic.org/t/specifying-the-site-url-for-a-fresh-install/28889>\
**Category:** Mautic 4 Install/Upgrade Support\
**Created:** [August 9, 2023, 5:58am UTC](https://forum.mautic.org/t/specifying-the-site-url-for-a-fresh-install/28889 "2023-08-09T05:58:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![genesys](https://avatars.discourse-cdn.com/v4/letter/g/ebca7d/32.png) [@genesys](https://forum.mautic.org/u/genesys)\
**Post date:** [August 9, 2023, 5:58am UTC](https://forum.mautic.org/t/specifying-the-site-url-for-a-fresh-install/28889/1 "2023-08-09T05:58:51Z")

</div>

I’m using the mautic/mautic:v4 docker image.

I’m using Nginx in a separate container to provide SSL termination. When I navigate to Mautic using my fully qualified domain name, Mautic is redirecting to “[http://mautic/index.php/installer](http://mautic/index.php/installer)”. I’ve tried multiple variable names in the environment section of the docker-compose.yml file I’m using, but none make any difference. I’m using a bind mount to persist the config and have tried adding ‘site\_url’ =\> ‘[https://mautic.mydomain.com](https://mautic.mydomain.com)’ to the local.php file, but this makes no difference. I’m clearing browser history between attempts, so that the 301 redirects are not cached.

I had in a previous attempt been able to manually change the URL redirected to to include my domain name, but this no longer works and I can’t get to the install screen.

How is the site’s URL meant to be set in the docker-compose.yml so that it’s available for the installer? None of the docker-compose examples I see have this, so I can’t understand how this works for anyone.

As a supplemental question; why doesn’t Mautic use the hostname from the request to understand it’s fully qualified domain name?