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 came across the same problem, fortunately, I solved it. I guess it causes by the 'localhost'.

1. Config different name for these IP in /etc/host
2. Remember to restart all the machines, things will go well.