I had faced a similar issue where despite using the above mentioned verified solution, my ssh was not working and it was because the known_hosts file was missing from ~/.ssh/ directory and the File System was read only. SO during run time also I was unable to create the ~/.ssh/known_hosts file.

If you face the similar issue then see if you can write the known_hosts file in the /tmp location. This is mostly write enabled even in a read-only file system.

Later in the ssh command you can specify the ssh to read the known_hosts file from /tmp location.

ssh -o UserKnownHostsFile=/tmp/known_hosts -o StrictHostKeyChecking=no user_name@destination_server_ip

I had faced a similar issue where despite using the above mentioned verified solution, my ssh was not working and it was because the known_hosts file was missing from ~/.ssh/ directory and the File System was read only. SO during run time also I was unable to create the ~/.ssh/known_hosts file.

If you face the similar issue then see if you can write the known_hosts file in the /tmp location. This is mostly write enabled even in a read-only file system.

Later in the ssh command you can specify the ssh to read the known_hosts file from /tmp location.

ssh -o UserKnownHostsFile=/tmp/known_hosts -o StrictHostKeyChecking=no user_name@destination_server_ip