Logging in is not a requirement to use Vagrant. The vast majority of Vagrant does not require a login. Only certain features such as protected boxes or Vagrant Share require a login.
The reference of available command-line flags to this command is available below.
--check- This will check if you are logged in. In addition to outputting whether you are logged in or not, the command will have exit status 0 if you are logged in, and exit status 1 if you are not.
--logout- This will log you out if you are logged in. If you are already logged out, this command will do nothing. It is not an error to call this command if you are already logged out.
--token- This will set the Vagrant Cloud login token manually to the provided string. It is assumed this token is a valid Vagrant Cloud access token.
Securely authenticate to Vagrant Cloud using a username and password:
$ vagrant login
Vagrant Cloud username:
Vagrant Cloud password:
Check if the current user is authenticated:
$ vagrant login --check
You are already logged in.
Securely authenticate with Vagrant Cloud using a token:
$ vagrant login --token ABCD1234
The token was successfully saved.