ssh: Could not resolve hostname localhost: nodename nor servname provided, or not known

搭建Hadoop伪集群的时候，需要ssh 免密登录，当执行hadoop启动脚本是时候报错：  解决 一、运行SSH    (1)ssh-****** -t rsa -P '' -f ~/.ssh/id_rsa    (2)cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys    (3)ssh localhost       要保证：  ~/.ssh需要是

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