有没有办法在两个ec2实例之间进行rsync？我发现了这个Rsync to Amazon Ec2 Instance，但它从本地到ec2实例。这是命令
rsync -av --progress data/* root@ipaddress:(path to folder)
错误
Failed to add the host to the list of known hosts.
Permission denied (publickey).
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(600) [sender=3.0.6]