Hadoop format HDFs Error JAVA.NET.UNKNOWNHOSTEXCEPTION:CENTOS0

In the Hadoop installation configuration process, the HDFS format

$ HDFs Namenode-format

An error occurred;

Java.net.UnknownHostException:centos0

As follows:

View Machine Name

$ hostname

Solution Method:

Modifying the hosts mapping file

Vi/etc/hosts

Modify to the following configuration, Centos0 is the machine name,

127.0.0.1                localhost       centos0
192.168.1.114           localhost      centos0

Reformat again

$ HDFs Namenode-format

Problem solved, run successfully.