Piwigo

Piwigo is a long-lasting, solid and versatile photo gallery software. It is based on PHP and it's been around 21+ years, so for some it might be considered as ancient, but it's not and while maybe not fancy based on new technology, it's under active development today and widely used all around the world.

There are also mobile apps associated to Piwigo that can take care of backup and mobile editing.

Piwigo is PHP based, so you need to follow Using independent PHP for different services to create an instance of PHP-FPM for Piwigo. I will assume you have your PHP-FPM up and running before going forward.

Ensure you have PHP emerged with mysqli and fpm, if you don't have it already, emerge it again:

echo dev-lang/php fpm mysqli >> /etc/portage/package.use/piwigo
emerge -vp php

Now, create the usual service user that i will call piwigo. This user should be member of the photos group:

useradd -d /data/daemons/piwigo -m -g photos piwigo

The full Piwigo installation guides are here.

You need to download and unpack Piwigo latest release:

su - piwigo
wget -O piwigo.zip "https://piwigo.org/download/dlcounter.php?code=latest"
unzip piwigo.zip

This will create a subfolder called piwigo.

piwigo.conf

location /piwigo/ {
        root /data/daemons/piwigo/;
        index index.php;

        location ~ /.*\.php$ {
                try_files $uri =404;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                include fastcgi_params;
                fastcgi_param SCRIPT_FILENAME $request_filename;
                fastcgi_pass 127.0.0.1:9002;
        }
}

Make sure the port (9002) matches your PHP-FPM port!