1.First of all

A memo of the procedure to create a user with a blank password on CentOS7 and enable login from the terminal at hand.
Prepare MacOS physical media. Make sure that you can log in to CentOS7 from the terminal as a blank password user.

2. Procedure

First, create a user and set a temporary password

# useradd <Username you want to create>
# passwd <Username created above>
user<Username created above>Change your password.
new password: ******** 
Please re-enter your new password: *******
passwd:All authentication tokens have been successfully renewed.

Delete the user password created above.

# passwd -d <Username created above>
user<Username created above>Delete password.

You cannot log in as it is (By default, you are not allowed to log in with a blank password). Edit the sshd config file.

# vi /etc/ssh/sshd_config 

* Changed the following parts to "yes".
PermitEmptyPasswords yes

After editing the above, restart sshd.

# systemctl restart sshd

With the above, user login with an empty password can be realized.

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