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

Obviously,your core-site.xml has configure error.

 fs.defaultFS
 hdfs://namenode:8020

Your fs.defaultFS setting as hdfs://namenode:8020,but your machine hostname is datanode1.So you just need change namenode to datanode1 will be OK.