Set Up Persistent URL Rewrites in Synology NAS webstation

Directly editing Synology's default nginx index file does not persist after a restart. Here's a way to make a website's URL rewrite rules permanent.

Steps

1. Log in to the NAS via SSH, then obtain root privileges

2. Find the website's configuration directory

Check the website ID in Synology's /var/tmp/nginx/app.d/server.webstation-vhost.conf, as highlighted in red below

Command:

vi /var/tmp/nginx/app.d/server.webstation-vhost.conf

3.Open the configuration file in the directory

Go to the directory highlighted in red above, create a user.conf configuration file, paste in the rewrite rules, and save it to make them permanent.
Command:

vi /usr/local/etc/nginx/conf.d/ba35bf8c-0072-48c0-9c70-xxxxxxxxx/user.conf

4. Reload nginx

nginx -s reload

An easier method

We can include our own custom configuration file in a file such as /usr/local/etc/nginx/conf.d/ba35bf8c-0072-48c0-9c70-xxxxxxxxx/user.conf to make editing easier. For example, add this to user.conf:

include /volume1/web/example/example.conf;

Then we can simply edit the example.conf file directly.