Run Jekyll server on a different port

It’s very easy to serve a Jekyll blog locally. You just run the following command in the command prompt:

jekyll serve

Even simpler, you can use the short version: jekyll s.

However, if there’s something already serving on port 4000, then you will get an error that might look a bit like this:

jekyll 3.9.2 | Error:  Address already in use - bind(2) for 127.0.0.1:4000
/home/pc/.rbenv/versions/3.1.3/lib/ruby/3.1.0/socket.rb:201:in `bind': Address already in use - bind(2) for 127.0.0.1:4000 (Errno::EADDRINUSE)

To fix this issue, you need to instruct Jekyll to run the blog locally on a different port.

How to run jekyll serve on port 4001?

To run the jekyll serve command on port 4001, you need to specify this port using the following flag:

jekyll serve --port 4001

You can also use the abbreviated command:

jekyll s --port 4001

This means that you can run serveral Jekyll blogs locally at the same time, simply by changing the port number on each Jekyll blog you’re running locally.