2.3 SSH Host Keys - Oracle Help Center

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2.3 SSH Host Keys

On some operating systems, when you first log in to the CLI, you may be prompted to add the key fingerprint of the Oracle VM Manager host to the ~/.ssh/known_hosts file, for example:

$ ssh -l admin hostname -p 10000 The authenticity of host 'hostname (IP_address)' can't be established. DSA key fingerprint is fingerprint. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'hostname' (DSA) to the list of known hosts. admin@hostname's password:

If you want to avoid this message and have host keys automatically added to the known_hosts file, you can turn off strict checking of SSH host keys using the following command:

$ ssh -o 'StrictHostKeyChecking no' admin@hostname

If you have upgraded or reinstalled Oracle VM Manager, you may be prompted that the host identification has changed when connecting to the CLI, for example:

$ ssh -l admin hostname -p 10000 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the DSA host key has just been changed. The fingerprint for the DSA key sent by the remote host is fingerprint. Please contact your system administrator. Add correct host key in /root/.ssh/known_hosts to get rid of this message. Offending key in ~/.ssh/known_hosts:1 DSA host key for localhost has changed and you have requested strict checking. Host key verification failed.

To clear this message and allow connections to the CLI, use the ssh-keygen utility to remove the entry for the Oracle VM Manager host, for example:

$ ssh-keygen -R hostname:10000

You may need to add braces around the hostname if the previous command does not remove the entry, for example:

$ ssh-keygen -R [localhost]:10000

Alternatively, edit the ~/.ssh/known_hosts file and remove the entry for the Oracle VM Manager host.

Connect to the CLI again and you are prompted to add the new fingerprint if strict checking of SSH host keys is enabled.

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