12. Frequently Asked Questions¶

I get this error when accessing via SSH my virtual machine:

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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
c8:1b:1d:37:61:ee:9f:e4:db:5b:31:91:35:7b:d2:59.
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:3
RSA host key for 10.64.51.7 has changed and you have requested strict checking.
Host key verification failed.

SOLUTION: the IP of your VM has probably been reused. You need to delete the offending entry on your /home/user/.ssh/known_hosts file. For example you can use:

sed -i '/^10.64.51.7 ssh/d' .ssh/known_hosts

and try again to connect.

I can’t see anymore my data after a reboot of my instance

SOLUTION: Are the data on an volume ? Did you remember to mount this volume ? Please also see this section.

I am using a flavor which has a supplementary ephemeral disk, but I not able to change ownership / mode of a directory

SOLUTION: A ‘fat’ file system is used for the supplementary ephemeral disk. We suggest to reformat this file system as described in Flavors with supplementary ephemeral disk.