Hadoop UI shows only one Datanode

Question

I\'ve started hadoop cluster composed of on master and 4 slave nodes.

Configuration seems ok:

hduser@ubuntu-amd64:/usr/local/hadoop$ ./bin/hdfs dfsadmin -rep

Answer 1

I have the same trouble because I use ip instead of hostname, [hdfs dfsadmin -report] is correct though it is only one[localhost] in UI. Finally, I solved it like this:

       dfs.datanode.hostname                   
       the name you want to show

you almost can't find it in any doucument...