sudo docker run -p 8888:80 -itd binwiederhier/ntfy serve

Server config file (server.yml): https://github.com/binwiederhier/ntfy/blob/main/server/server.yml
mkdir /etc/ntfy
nano /etc/ntfy/server.yml

sudo docker run \
-v /var/cache/ntfy:/var/cache/ntfy \
-v /etc/ntfy:/etc/ntfy \
-p 8888:80 \
-itd \
binwiederhier/ntfy \
serve \
--cache-file /var/cache/ntfy/cache.db