Google Cloud VM when sudoing asks for password

Question

I've been working with a Google Cloud debian VM and had no problem at all doing super user tasks using sudo (sudo was not asking for password).

Today I connected via SSH as usual and when I try to sudo something it started asking for password:

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for -----:

According to the documentation it should not ask for password as is already SSL Key authenticated connection.

score 6 · Answer 1 · answered Dec 22 '19 at 09:10

Today I had the same problem with CentOS 8.x VM. After some testing I found a more simple solution. The group "google-sudoers" is allowed to sudo in /etc/sudoers.d/google_sudoers file, so, to fix the problem and make it permanent add your user to "google-sudoers" group with the next steps:

SSH to your VM from GCP's web console
Run sudo usermod -a -G google-sudoers USER to add your USER to google-sudoers group
Close your current SSH session and open a new one
Test that everything works ok

You should be able to run sudo commands or gain root again.

score 1 · Answer 2 · answered Aug 01 '19 at 06:31

1

To avoid this, one solution is open the ssh terminal on the web browser from GCP console. You can give a try on this. This is because of SSH key related configuration on Google Clound Engine

answered Aug 01 '19 at 06:31

Nizamudheen At

334
2
9

score 0 · Accepted Answer · answered Apr 07 '17 at 02:22

0

I have solved this issue by myself. I post the steps i've followed for anyone who has a similar problem:

Deleted the VM instance preserving the disk.
Created new VM instance for recovering pruposes.
Attached the old VM disk to the new instance
Mounted into /mnt/
```
# mount /dev/sdb1 /mnt/
```
Change root to mounted partition
```
# chroot /mnt/
```
Now edit the sudoers file and the user password and group as needed
Unmount the disk
```
# umount /dev/sdb1
```
deattach the disk, delete the recovery instance, and recreate the old VM with the same disk

answered Apr 07 '17 at 02:22

Esteban Panelli

178
2
10

I don't understand, I have the same problem, and I have created recovery instance like you describe, and mount the disk ... but what needs to be changed in sudoers file? Everything looks fine – Anders Emil Oct 18 '18 at 06:37
you should have a line like this in sudoers: your-username ALL=(ALL:ALL) NOPASSWD:ALL – Esteban Panelli Oct 18 '18 at 23:00

score 0 · Answer 4 · answered Jan 03 '19 at 19:08

0

I encountered this problem right now, under the same circumstances you did (suddenly asking about the password) but I just logged out (closed the ssh session) and logged back in and it worked.

answered Jan 03 '19 at 19:08

Cosmin Ioniță

3,598
4
23
48

Google Cloud VM when sudoing asks for password

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