sudo ansible -m ping hosts

Enter passphrase for key '/home/myuser/.ssh/id_rsa':Enter passphrase for key '/home/myuser/.ssh/id_rsa':

Enter passphrase for key '/home/myuser/.ssh/id_rsa':

$ ansible all -i /tmp/hosts2ping -m ping

$ ansible all -i /tmp/hosts2ping -a id -k
SSH password: <enter password>
10.1.2.3 | SUCCESS | rc=0 >> uid=nnnn<non-root-account>.....

$ ansible all -i /tmp/hosts2ping -a id -k -Kb
SSH password: <enter password>
SUDO password[defaults to SSH password]: <RETURN>
10.1.2.3 | SUCCESS | rc=0 >> uid=0(root).....

$ ssh-add
Enter passphrase for .ssh/id_rsa:
identity added: .ssh/id_rsa

$ ansible all -i /tmp/hosts2ping -a id   # -k not needed
10.1.2.3 | SUCCESS | rc=0 >> uid=nnnn<non-root-account>.....

$ ansible all -i /tmp/hosts2ping -a id -Kb   # -k not needed
SUDO password[defaults to SSH password]: <RETURN>
10.1.2.3 | SUCCESS | rc=0 >> uid=0(root).....

$ ansible all -i /tmp/hosts2ping -a id -k -Kb --become-user=<shared-account>
SSH password: <enter password>
SUDO password[defaults to SSH password]: <RETURN>
10.1.2.3 | SUCCESS | rc=0 >> uid=43526(<shared-account>).....