In CentOS 8.x Docker install Step: remove podman when existing (#8016)

roles/container-engine/docker/defaults/main.yml

@@ -33,6 +33,10 @@ docker_remove_packages_yum:
   - docker-logrotate
   - docker-engine-selinux.noarch
 
+# remove podman to avoid containerd.io confliction
+podman_remove_packages_yum:
+  - podman
+
 docker_remove_packages_apt:
   - docker
   - docker-engine

roles/container-engine/docker/tasks/pre-upgrade.yml

@@ -15,6 +15,17 @@
     - ansible_os_family == 'Debian'
     - (docker_versioned_pkg[docker_version | string] is search('docker-ce'))
 
+
+- name: Ensure podman not installed. | RedHat
+  package:
+    name: '{{ podman_remove_packages_yum }}'
+    state: absent
+  when:
+    - ansible_os_family == 'RedHat'
+    - (docker_versioned_pkg[docker_version | string] is search('docker-ce'))
+    - not is_ostree
+
+
 - name: Ensure old versions of Docker are not installed. | RedHat
   package:
     name: '{{ docker_remove_packages_yum }}'