The upgrade failes with the following error:
Failed to check the YUM configuration on hosts registered in PPA. Check the following hosts and make sure that YUM works, OS YUM repositories are configured and OS packages can be downloaded from them: * host 'dns3.domain.tld' (11) YUM configuration check failed: OS YUM repositories are not available
YUM repositories are not configured on the Service Node "dns3.domain.tld".
Configure yum repositiries in
/etc/repos.d as it is configured on the another Service Node. Usually Service Node should contain poa.repo repository as below:
[root@apache ~]# cat /etc/yum.repos.d/poa.repo [repo-id-4] name=repo-id-4 baseurl=http://18.104.22.168/tarballs/RHEL/6/x86_64/YUM gpgcheck=0