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README.md - specify envs are not read after installation 

closes https://github.com/nextcloud/server/issues/40904

Signed-off-by: Gabriel Vîjială <gabriel.vijiala@gmail.com>
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Gabriel Vîjială 2023-10-13 18:06:02 +03:00 committed by GitHub
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@ -258,6 +258,22 @@ Check the [Nexcloud documentation](https://docs.nextcloud.com/server/latest/admi
Keep in mind that once set, removing these environment variables won't remove these values from the configuration file, due to how Nextcloud merges configuration files together.
## Changing database connection options after installation
At installation time, the values are taken from the environment variables above and saved into the `config.php` file. Changing these envrionment variables after installation will not change the `config.php` file, and will not be picked up at runtime.
If one of these values needs to change, for example `MYSQL_HOST`, one must either manually edit the `config.php` file, or create a new custom configuration file (for example, `config/dbhostoverride.config.php`) with content:
```
<?php
$CONFIG = array (
'dbhost' => getenv('MYSQL_HOST'),
);
```
And add keys to this file for each value expected to change (dbhost, dbport, passwords, etc).
# Running this image with docker-compose
The easiest way to get a fully featured and functional setup is using a `docker-compose` file. There are too many different possibilities to setup your system, so here are only some examples of what you have to look for.