Create a user with an empty password on CentOS7

1.First of all

2. Procedure

# 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.
# passwd -d <Username created above>
user<Username created above>Delete password.
# vi /etc/ssh/sshd_config 

* Changed the following parts to "yes".
PermitEmptyPasswords yes
# systemctl restart sshd

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

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