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Yes, I can use. I think its better to more describe my problem. I have 3 instances on my own OpenStack cloud user. I can log on them out of the cloud by the same key which I added in OpenStack. Now I need to test my instances by MPI and it is needed to all instances can OpenSSH without a password but I can not ssh between instances even by password but I checked my ping between them which were okay and ssh port also was open and can be found in the error after ssh even by password. I mean my main problem is that I can not ssh between instances in OpenStack.

ubuntu@blue:~$ ssh ubuntu@192.168.2.5

The authenticity of host '192.168.2.5 (192.168.2.5)' can't be established. ECDSA key fingerprint is SHA256:8ZRA14NqZlRi1bf6S26XajQnoeHyGnzAjaQWuuwDZg8. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.2.5' (ECDSA) to the list of known hosts. Permission denied (publickey).

Yes, I can use. I think its better to more describe my problem. I have 3 instances on my own OpenStack cloud user. I can log on them out of the cloud by the same key which I added in OpenStack. Now I need to test my instances by MPI and it is needed to all instances can OpenSSH without a password but I can not ssh between instances even by password but I checked my ping between them which were okay and ssh port also was open and can be found in the error after ssh even by password. I mean my main problem is that I can not ssh between instances in OpenStack.

ubuntu@blue:~$ ssh ubuntu@192.168.2.5

The authenticity of host '192.168.2.5 (192.168.2.5)' can't be established. ECDSA key fingerprint is SHA256:8ZRA14NqZlRi1bf6S26XajQnoeHyGnzAjaQWuuwDZg8. Are you sure you want to continue connecting (yes/no)? yes yes

Warning: Permanently added '192.168.2.5' (ECDSA) to the list of known hosts. Permission denied (publickey).