Hadoop啟動HDFS進程的時候報錯，提示權限不夠，具體信息如圖所示：
localhost: frankxulei@localhost: Permission denied (publickey,password).

frankxulei@ubuntu:/usr/local/hadoop$ sbin/start-all.sh
WARNING: Attempting to start all Apache Hadoop daemons as frankxulei in 10 seconds.
WARNING: This is not a recommended production deployment configuration.
WARNING: Use CTRL-C to abort.
Starting namenodes on [localhost]
localhost: frankxulei@localhost: Permission denied (publickey,password).
Starting datanodes
localhost: frankxulei@localhost: Permission denied (publickey,password).
Starting secondary namenodes [ubuntu]
ubuntu: frankxulei@ubuntu: Permission denied (publickey,password).
Starting resourcemanager
Starting nodemanagers
localhost: frankxulei@localhost: Permission denied (publickey,password).
frankxulei@ubuntu:/usr/local/hadoop$
解決辦法，復制導入公鑰就可以了，SSH鏈接需要使用公鑰認證：

切換到ssh目錄：cd ~/.ssh/

ssh-keygen -t rsa -P "" cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys

再次啟動HDFS就可以了，
sbin/start-dfs.sh

總結

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