sudo -i 免密直接進入root

useradd tuser

usermod -G wheel tuser
 

[root@testhost ~]# visudo 

將

%wheel  ALL=(ALL)       ALL

修改成

%wheel  ALL=(ALL)       NOPASSWD: ALL

效果如下 

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cirros 鏡像的sudo -i進入root設置
# vi /etc/sudoers.d/90-cirros-user
# cirros user needs passwordless sudo
cirros ALL=(ALL) NOPASSWD:ALL