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

As @Rahul said the problem is because of the same hostname

change your hostname in /etc/hostname file and give different hostname for each host and resolve hostname with ip address /etc/hosts file

then restart your cluster you will see all datanodes in Datanode information tab on browser