aqib@aqib-Inspiron-5521:~$ start-dfs.sh
Starting namenodes on [aqib-Inspiron-5521]
pdsh@aqib-Inspiron-5521: aqib-Inspiron-5521: ssh exited with exit code 1
Starting datanodes
Starting secondary namenodes [aqib-Inspiron-5521]
pdsh@aqib-Inspiron-5521: aqib-Inspiron-5521: ssh exited with exit code 1

即使使用以下命令创建localhost ssh，我也会遇到同样的错误：

ssh-keygen
ssh-copy-id -i .ssh/id_rsa.pub localhost

有人能帮我吗？