ssh: Could not resolve hostname DataNode1: Name or service not known

When SSH connects to other nodes in the process of building Hadoop cluster

ssh hadoop@DataNode1

Error: SSH: could not resolve host name datanode1: name or service not known

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Solution:

The related configuration file of Linux host name is/etc/hosts

In this file, you need to configure not only the local IP and the host name, but also the IP and the host name of the connecting node