Linux: Add Sudo User to Ubuntu System

Step 1 – SSH into node. This will have to be done for each node.

Step 2 – Add user, we’ll use example_user and an example user: sudo adduser example_user

Step 3 – Set user password.

Step 4 – You will be prompted for user information. You can fill in or leave all blank.

Step 5 – y for information correct.

Step 6 – Add the user to the sudo group: sudo usermod -aG sudo example_user

Step 7 – Test sudo for user:

Step 1 – Switch to root user as a failsafe: sudo su - root

Step 2 – Switch back to user you logged in with, replace <username> with name of user : su - <username>

Now if the /etc/sudoers file is not edited properly, you can 'exit' to root to fix.

Step 3 – sudo visudo -f /etc/sudoers

Step 4 – Add line to bottom: example_user ALL=(ALL) NOPASSWD:ALL

NOTE: Note: If the solution provider has a specific entry they use here, you can use that. This provides passwordless sudo for all commands.

Step 5 – [Ctrl]+x to exit

Step 6 – Y to save

Step 7 – Hit [Enter] to write file

Step 8 – Test that sudo still works: sudo date

If sudo fails, exit to root
Go to step 4 and verify added line is correct.
Without exiting root, switch back to user you logged in with, replace <username> with name of user
su - <username>
Test sudo: sudo date

Step 9 – Exit to root with: exit

Step 10 – Switch to example_user: sudo su - example_user

Step 11 – Test that sudo works without password: sudo date

Step 12 – Done. Exit out of all terminals.