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Suppose that I had set the root password before with ssh key. Hereinafter, I want to let the root without password. Is there a way to do that?

Thank you

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This may be of some help to you. I'm not familiar with doing what you want, so I can't support you further. – Paul Tanzini Dec 9 '13 at 23:37
What do you mean? Did you set a password on the root account, or install your ssh key into /root/.ssh/authorized_keys? – psusi Dec 10 '13 at 2:46
@Dash_plus_Java : Thank you for the reference, I will read it and try to understand. – Santosa Sandy Dec 13 '13 at 9:28
@psusi , sorry for not being precise, but I mean when we set root password on the root account. When we leave the password blank, is that mean that we have no root password? BTW, I am also interested about installing ssh key into /root . Would you mind to give me a little explanation on that? Thank you – Santosa Sandy Dec 13 '13 at 9:28
up vote 1 down vote accepted

In Ubuntu the root account has no password but is locked by default, so that you can not log in as root using a password. If you paste your public key ( ~/.ssh/ ) into root's authorized_keys file ( /root/.ssh/authorized_keys ) then you can log in via 'ssh' as root without needing a password.

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Yes you can set the root without password to SSH login without password, but it's highly not recommended, user other user then use su to become root.

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OK thanks for trying to answer. – Santosa Sandy Mar 29 '14 at 19:43

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