How to execute a command as a root user in ansible hosts - ansible

Question

I have 3 VM's for ansible as follows:
master
host1
host2
ansible is installed and configured correctly. no issue with that part.
So I have this command I need to run. Before going to execute this command using ansible, I will show you how to do this without ansible :
I want to install update the packages first, so I am logged into the VM as a normal user (ubuntut) and execute like this:
sudo apt-get update -y
As you can see, I have executed a sudo command when I am logged in as the ubuntu user but not as a root user.
So above command is executed with sudo but user is ubuntu
I want this scenario to be done using ansible.
My Question: How to execute a command that contains sudo using ansible but when logged in as a different user
So my playbook will look like this:
- hosts: all
tasks:
- name: Update and upgrade apt packages
become: ubuntu
apt:
upgrade: yes
update_cache: yes
But where can I add the sudo part in above playbook ? does it add automatically?
What if I want to execute a command like this, logged in user as ubuntu:
sudo apt-get install docker
How can I do this sudo part in ansible while become: ubuntu

Answer 1

To invoke a command as sudo, You can do something like this :
- hosts: all
tasks:
- name: Update and upgrade apt packages
become: ubuntu
# this will fail because /opt needs permissions
# shell: echo hello > /opt/testfile
# this will work
shell: "sudo sh -c 'echo hello > /opt/testfile'"
# use this to verify output
register: out
- debug:
msg: "{{ out }}"
NOTE: you will get this warning:
"Consider using 'become', 'become_method', and 'become_user' rather
than running sudo"

Answer 2

The following will work, you can find a detailed explanation and examples in ansible documentation.
[1]https://docs.ansible.com/ansible/latest/user_guide/become.html
- hosts: all
tasks:
- name: Update and upgrade apt packages
become: true
become_user: ubuntu
shell: echo hello > /opt/testfile
# use this to verify output
register: out
- debug:
msg: "{{ out }}"