Permission Denied error while running start-dfs.sh

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I also encountered the same thing, I did so
I found that my pdsh default rcmd is rsh, not ssh, rsh and ssh remote login authentication is not the same, when installing hadoop I configured ssh localhost password-free login, but rsh is not possible.

so，try：

1.check your pdsh default rcmd rsh

pdsh -q -w localhost

See what your pdsh default rcmd is.

2.Modify pdsh’s default rcmd to ssh

export PDSH_RCMD_TYPE=ssh

you can be added to ~/.bashrc, and source ~/.bashrc

3.sbin / start-dfs.sh

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