rescue mode

I‘ve a remote Unix server running with OpenSSH remote login service. The openssh is configured for passwordless login using ssh keys. Our ISP allows to boot all Linux servers into the rescue mode. It allow us to bring a server online remotely in order to troubleshoot system problems that would normally only be resolved by an OS Reload (such as accidentally deleting files or wrong firewall configurations blocking ssh access). When server boots into a remote rescue mode I can connect using SSH. They SSH keys will not be the same in the rescue mode so I get key mismatch messages as SSH keys are re-generated on each boot:

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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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 RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
e1:9b:5c:16:a6:cd:11:10:3a:cd:1b:a2:16:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for www.cyberciti.biz has changed and you have requested strict checking.
Host key verification failed.

How do I ignore OpenSSH hos key checking from my Apple OS X laptop while login using the ssh?

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Q. I’m using Debian Linux and CentOS operating system. My question is what do I do if my server refused to boot? How do I troubleshoot the problem? A. Usually most Linux distribution provides rescue mode. It allows to access to disk partition and you are allowed to solve the problem. To use the rescue […]

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Q. How do I boot my Ubuntu Linux server into Rescue mode to fix system? A. You can boot Ubuntu Linux into rescue mode when things go wrong, there are several ways to work on fixing them. However, you must understand your system and what to fix in case of emergency. Use this mode only […]

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Q. Can I run fsck or e2fsck command when Linux file system is mounted? Do you advice to run fsck on a live file system? I am using Cent OS. A. No. Do not run fsck on a live or mounted file system. fsck is used to check and optionally repair one or more Linux […]

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Q. I forgot my root password, how can I get into my system? A. You can reset forgotten root password under Linux by booting system into single user mode or emergency mode (also known as rescue mode). My boot loader is GRUB (see LILO boot loader below) )Following is the procedure to reset root password […]

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