Sudoers file not reflect changes

Question

Hi, I used detached the old disk, changed sudoers file and added NOPASSWD: Then reactched to the old instance. When I login from putty, it still ask me for newuser password WHICH I know it and got refused ssying not in sudoers that I added it.
I added in sudoers before the last @includedir
newuser ALL=(ALL) NOPASSWD:ALL 
I also tried add it in /etc/sudoers.d 
And NOPASSWD: for other users, when I tried to swtich to root: su root, it says AUTHENTICATION FAILED.

I checked /etc/passwd and shadow files in the old disk, it's correct:
newuser:x:1001:1001:old,1,323,323,user:/home/newuser:/bin/bash newuser:$6$/

Please help with this AWS EC2 rediculous problem.

Thanks!

Answer

It might nott be the cause but `sudo` will refuse to load any instructions from sudoers file if the syntax is not correct. Double check the syntax or use `visudo`, this might not be possible in your case as you're editing the file from a non standard path.

Sudoers file not reflect changes

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