Hello Experts,   I finally found and resolved the problem. I destroyed all the VM and built new ones. I kept only the database VM on which I droped the database scm and re-created it (to empty it). In our company, we use proxy to go on Internet, direct access is forbidden. So I re-wrote the repo files in /etc/yum.repos.d  to put   proxy=http://<proxy_user>:<proxy_password>@<proxy_url>:8080/    after each repo definition. I canceled in /etc/yum.conf  all proxy definition. The repos for cloudera-cm and cloudera-cdh  were written with the local repo I created and filled with the good packages. I ran  yum update to get rpg-key (for epel-release). The only disadvantage with this method is : no parcels can be used (the proxy definition in the wizard crashed the download (timeout connexion)).   Thanks for your help. Alain ... View more