I recently had the situation where I needed to run an Ansible task on a user which I sudo su'd into i.e.:

sudo su jenkins

I then ran my Ansible task and I repeatedly got this error:

TASK [zzet.rbenv : update apt cache] ****************************************************************************************************************
fatal: [localhost]: FAILED! => {"changed": false, "module_stderr": "sudo: a password is required\n", 
"module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

The underlying issue was that most of the tasks in the playbook used:

become: true

which says to Ansible "run this as a sudo operation" and, given that I was already sudo'd into this account, that proved to be a failure. I puzzled over this for a bit and then realized that all I needed to do was grant the jenkins account passwordless sudo access via the command:

sudo visudo

by adding this line to the end of the sudoers file that visudo edits:


Note: I made sure to remove the jenkins account from visudo after this was done to prevent any issues related to sudo exploits and this user.