Incorrect configuration: namenode address dfs.namenode.rpc-address is not configured

Question

I am getting this error when I try and boot up a DataNode. From what I have read, the RPC paramters are only used for a HA configuration, which I am not setting up (I think)

Answer 1

Check your '/etc/hosts' file:
There must be a line like below: (if not, so add that)
namenode 127.0.0.1
Replace 127.0.01 with your namenode IP.