Change default port from 5000 to 3000

[kud]

Due to a conflict with AirPlay, it could be interesting to change the default port: https://developer.apple.com/forums/thread/682332

related: #672
info: https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

[kachkaev]

3000 is used by Next.js and CRA by default, which means that ports will often clash in practice. Having said that, I don’t know what alternative number would be a clear winner.

Nice-looking ports like 6000, 9000 or 10000 are all used for something else, according to Wikipedia. Going for 30000 would require folks to count zeros and is therefore error-prone. Maybe 3030? 🤷

[leo]

I don't think it will be common that people will run tools like Next.js and CRA and the same time as serve, but if they do, --listen <port> can be used for defining a custom one.

3000 as the new default sounds good to me!

[leo]

Thank you!

[kud]

My pleasure 😊

[mariojfduarte]

If you have a Docker Swarm mode cluster set up with traefik as a load balance to do wtv, don't forget to change alll your docker files that use serve default port in order to prevent Bad Gateway connection errors.

`
...
RUN yarn global add serve
...
CMD serve -s -p 5000 build
...

`