![]() ![]() Due to its simplicity, this method is highly recommended if available. ![]() However, this command requires at least one password query and - sometimes - an additional interaction of the type: The authenticity of host 'xxx (xxx)' can't be established. The quickest way to copy your public key to the Ubuntu host is to use a utility called ssh-copy-id. The idrsa is the private key, and idrsa.pub is the public key. By default, the command saves these keys to the users /.ssh/idrsa and /.ssh/idrsa.pub files. The key fingerprint is: After that use, the ssh-copy-id command, should work. The ssh-keygen command generates the private and public key pair. Your public key has been saved in /root/.ssh/idrsa.pub. I believe you understand the basic SSH concept. We’ll use ssh-keygen to create SSH public keys. Here are two methods to copy the public ssh key to the server. Step 1 Create the SSH keys When you install SSH, it comes with a bunch of handy tools. In which $hostname is the hostname of the system with the username, e.g. Enter file in which to save the key (/root/.ssh/idrsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/idrsa. Step 1: Get the public key Step 2: Create ssh directory in the user’s home directory (as a sysadmin) Step 3: Set appropriate permission to the file Public key authentication allows you to access a server via SSH without password. For all of this to work, you need to share your public key with the remote machines you are trying to SSH to. I am using the following syntax to copy a public key to a host, in order to be able to log in afterwards to the host without password query: ssh-copy-id $hostname Lets look at the final step in successful SSH key-based authentication.
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