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For some reason, I have a server that if ssh into another server...you don't need to enter the password.

How is this done? Can someone give me step by step instructions please?

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migrated from stackoverflow.com Nov 10 '09 at 3:44

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4 Answers

up vote 6 down vote accepted

Check out this article. Essentially, I believe you're looking to generate and share keys between the local and remote machines in each ~/.ssh folder. The article outlines it better than I could. (And if that fails you, it's an easily Google-able subject).

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up vote 2 down vote

ssh keys + an ssh-agent, you may also want to look into keychain. Read the following set of gentoo articles by Daniel Robbins for a good overview on openssh key management.

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up vote 2 down vote

Most likely host-based authentication is enabled.

Look for the section on host-based authentication in the ssh manpage, and look for RhostsRSAAuthentication or HostbasedAuthentication in /etc/ssh/sshd_config

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+1 In absence of any further details from OP and the OP having not taken any extra steps to establish an identity key pair this is the best possible reason for this behavior. – Jeremy Bouse Nov 10 '09 at 14:34
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up vote 1 down vote

SSH Keys. Try man ssh-keygen. Basically the machine you SSH into has a key (in ~/.ssh) that the machine to automatically ssh into generated.

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