hosts.yml

---
all:
  vars:
    ansible_connection: docker
  hosts:
    ans_centos7:
    ans_centos8:

playbook.yml

---
- hosts: all

  tasks:
    - debug:
        var: ansible_python.version
    - debug:
        var: ansible_pkg_mgr 
    - package:
        name: wget

session.txt

$ docker run -d --rm --name ans_centos7 centos:7 tail -f /dev/null
8cc84f6c883d502597d3d51500835aafdf802244e919e209b24781b2506bc7d1

$ docker run -d --rm --name ans_centos8 centos:8 tail -f /dev/null
3ed7645cd053502fc978d2ae638ba85594eea1580b6e2345f60b1d1843ce32f3

$ ansible-playbook -i hosts.yml playbool.yml 

PLAY [all] ****************************************************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************************************
ok: [ans_centos8]
ok: [ans_centos7]

TASK [debug] **************************************************************************************************************************************
ok: [ans_centos7] => {
    "ansible_python.version": {
        "major": 2,
        "micro": 5,
        "minor": 7,
        "releaselevel": "final",
        "serial": 0
    }
}
ok: [ans_centos8] => {
    "ansible_python.version": {
        "major": 3,
        "micro": 8,
        "minor": 6,
        "releaselevel": "final",
        "serial": 0
    }
}

TASK [debug] **************************************************************************************************************************************
ok: [ans_centos7] => {
    "ansible_pkg_mgr": "yum"
}
ok: [ans_centos8] => {
    "ansible_pkg_mgr": "dnf"
}

TASK [package] ************************************************************************************************************************************
changed: [ans_centos7]
changed: [ans_centos8]

PLAY RECAP ****************************************************************************************************************************************
ans_centos7                : ok=4    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
ans_centos8                : ok=4    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

$ docker stop ans_centos7 ans_centos8
ans_centos7
ans_centos8