Hello clouderians,   I am currently installing Cloudera Manager in a cluster of 6 hosts (all with CentOS 7.1). When I try to add hosts to the cluster, their installation fail and the details are as show in the picture bellow. Configurations:  - The file /etc/hosts in every hosts have their IPs (all of each other) and names;  - They all have root access throught ssh, with publickey, to each other.  - The selinux is disabled (/etc/selinux/config);  - The perl packet is installed;   Does anyone have any suggestions?   Thank you very much in advance! António Eleutério     ... View more