cloudflared:tldr:27dc1

The command cloudflared tunnel --hostname ${hostname} localhost:${port_number} sets up a tunnel using cloudflared, a tool provided by the Cloudflare service. This tunnel connects a specified hostname to a local machine on a specific port number.

Let's break down the command:

• cloudflared is the command used to invoke the cloudflared tool.
• tunnel is the subcommand that specifies the action to set up a tunnel.
• --hostname ${hostname} is an option/flag that tells cloudflared the desired hostname for the tunnel. ${hostname} is a placeholder indicating that you need to provide the actual hostname value.
• localhost:${port_number} defines the target endpoint for the tunnel. localhost refers to the local machine, and ${port_number} is a placeholder indicating that you need to provide the actual port number value.

To use this command, you should replace ${hostname} with the desired hostname (e.g., example.com) and ${port_number} with the port number on your local machine you want to expose (e.g., 8080). This will create a tunnel that forwards traffic sent to example.com to the local machine's port 8080.