I have 3 VMs, Sandbox is installed on one of them as docker image. I'm trying to add 2 nodes to the Hadoop cluster. I have ssh from Sandbox VM to other VMs and I can ping all VMs (by ip and hostnames witch I set and added to /etc/hosts files), I also can ping from Sandbox VM to docker host ip (172.27.0.2). I made configurations according to this documentation https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_Installing_HDP_AMB/content/_prepare_the_environment.html. When I try to add new node through Ambari I get this message: Registration with the server failed. Ambari-server logs show this: 22 Feb 2017 18:21:13,174 WARN [ambari-client-thread-28] BootStrapResource:150 - Host sandboxnode116 cannot be determined. 22 Feb 2017 18:21:13,174 INFO [ambari-client-thread-28] BootStrapImpl:108 - BootStrapping hosts ... View more