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I see something like this in several Rails install guides. What exactly are we doing here?
Add default subdomain to /etc/hosts, for example:
“0.0.0.0 localhost.lan group1.localhost.lan group2.localhost.lan”
You could either bind a domain/subdomain to localhost 127.0.0.1 or 0.0.0.0 to have an address which you can use in your browser to access your app.
When a service is listening on 0.0.0.0 this means the service is listening on all the configured network interfaces, when listening on 127.0.0.1 the service is only bound to the loopback interface (only available on the local machine).
So “0.0.0.0 localhost.lan group1.localhost.lan group2.localhost.lan” means “Please make the domains localhost.lan, group1.localhost.lan and group2.localhost.lan browsable and point them to all my network adapters”.