ssh: Name or service not known

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

搭建hadoop集群过程当中 ssh链接其余节点时

ssh hadoop@DataNode1

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

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解决：

linux主机名的相关配置文件就是/etc/hosts

这个文件里不光要配置本机ip和主机名，还要配置链接节点的ip和主机名