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

搭建Hadoop僞集羣的時候，需要ssh 免密登錄，當執行hadoop啓動腳本是時候報錯：  解決 一、運行SSH    (1)ssh-****** -t rsa -P '' -f ~/.ssh/id_rsa    (2)cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys    (3)ssh localhost       要保證：  ~/.ssh需要是

>>阅读原文<<