[ovirt-users] ovirt-host-upgrade failed on centos 7.5 host with new ansible 2.7.1+ and its default yum: dnf backend

Hi, i found an permanent updates avail on centos 7.5 host with ovirt 4.2.7.5-1-el7 and ansible 2.7.1+. Background: ansible 2.7.1+ "auto use" the yum: backend. The new avail backend and auto selected backend "yum 4" uses "dnf" and didn't recognize the attribute "update_cache: yes" in yum: ansible task. #### Solution: * switch backend to old yum style. # diff /usr/share/ovirt-engine/playbooks/roles/ovirt-host-upgrade/tasks/main.yml.orig /usr/share/ovirt-engine/playbooks/roles/ovirt-host-upgrade/tasks/main.yml 11a12 * on ovirt node the file and the problem didn't exists. best regards. TASK [ovirt-host-upgrade : Install ovirt-host package if it isn't installed] ****************************************************************************************************************** task path: /usr/share/ovirt-engine/playbooks/roles/ovirt-host-upgrade/tasks/main.yml:8 fatal: [ovn-elem.example.org]: FAILED! => {"ansible_facts": {"pkg_mgr": "dnf"}, "changed": false, "module_stderr": "Shared connection to ovn-elem.example.org closed.\r\n", "module_stdout": "Traceback (most recent call last):\r\n  File \"/root/.ansible/tmp/ansible-tmp-1542705098.43-115863495291729/AnsiballZ_dnf.py\", line 113, in <module>\r\n    _ansiballz_main()\r\n  File \"/root/.ansible/tmp/ansible-tmp-1542705098.43-115863495291729/AnsiballZ_dnf.py\", line 105, in _ansiballz_main\r\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\r\n  File \"/root/.ansible/tmp/ansible-tmp-1542705098.43-115863495291729/AnsiballZ_dnf.py\", line 48, in invoke_module\r\n    imp.load_module('__main__', mod, module, MOD_DESC)\r\n  File \"/tmp/ansible_dnf_payload_KN71mV/__main__.py\", line 1079, in <module>\r\n  File \"/tmp/ansible_dnf_payload_KN71mV/__main__.py\", line 1068, in main\r\n  File \"/tmp/ansible_dnf_payload_KN71mV/__main__.py\", line 1044, in run\r\n  File \"/tmp/ansible_dnf_payload_KN71mV/__main__.py\", line 570, in _base\r\nAttributeError: 'Base' object has no attribute 'update_cache'\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}