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why sudo requires my password even if configured as NOPASSWD

I configured sudoers like this never to require my password.

Code:

ubuntu  ALL=(ALL:ALL) NOPASSWD:ALL
I'm wondering why sudo requires my password when doing "sudo -v".
For example, "sudo ls /root" or "sudo -s" can gain root privilege without typing my password.
However, in case of "sudo -v" requires password, why? Other Linux distro never require password
such case.

No password required in this case. That's what I expect.

Code:

ubuntu@localhost $ sudo ls -lha /root; sudo -k; sudo ls -lha /root;
total 24K
drwx------  4 root root 4.0K Jun 14 07:15 .
drwxr-xr-x 23 root root 4.0K Jun 14 07:35 ..
-rw-r--r--  1 root root 3.1K Oct 22  2015 .bashrc
drwxr-xr-x  2 root root 4.0K Jun 14 07:15 .nano
-rw-r--r--  1 root root  148 Aug 17  2015 .profile
drwx------  2 root root 4.0K May 20 07:09 .ssh
total 24K
drwx------  4 root root 4.0K Jun 14 07:15 .
drwxr-xr-x 23 root root 4.0K Jun 14 07:35 ..
-rw-r--r--  1 root root 3.1K Oct 22  2015 .bashrc
drwxr-xr-x  2 root root 4.0K Jun 14 07:15 .nano
-rw-r--r--  1 root root  148 Aug 17  2015 .profile
drwx------  2 root root 4.0K May 20 07:09 .ssh
Oddly, password required twice. In this case, password shouldn't be required.

Code:

ubuntu@localhost $ sudo -v; sudo -k; sudo -v
[sudo] password for ubuntu:
[sudo] password for ubuntu:
Debian's behaviour is what I expected.

Code:

debian@localhost $ sudo -v; sudo -k; sudo -v
debian@localhost $
Thanks,

برچسب: نویسنده: استخدام کار تاريخ: سه شنبه 25 خرداد 1395 ساعت: 15:46

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