[vagrant@host1]sudo su -

[vagrant@host1]sudo su - user1

vagrant ALL=(ALL) NOPASSWD:ALL

user1 ALL=(ALL) NOPASSWD:ALL

sudo adduser username
sudo adduser username sudo
printf "username ALL=(ALL) NOPASSWD:ALL" > username.tmp
sudo mv username.tmp /etc/sudoers.d/username
sudo chown -R root:root /etc/sudoers.d/username
sudo chmod 664 /etc/sudoers.d/username