Now, copy the id rsa.pub file to the remote host and append it to /.ssh/authorized keys with the following command:įurthermore, check the authorized keys file permissions only the authenticated user should have read and write access. The public key is saved in /.ssh/id rsa.pub by default, while the private key is saved in /.ssh/id rsa. When prompted to create the key, just press Enter. You will be asked for a password at some point along with the procedure. To produce keys with 4096 bits, for example, perform the following: The -b option can be used to change the number of bits. The generated keys will have 3072 bits at the time of writing. The RSA Algorithm will be used to produce the keys. To generate the keys, type the following into a terminal prompt: A private key and a public key are used in SSH key authentication. SSH allows two hosts to communicate without the use of a password. However, if ssh is your sole mode of access to a server, and you make a mistake configuring sshd via the /etc/ssh/sshd config file, you may find yourself locked out after restarting the server. Many other sshd configuration directives are available to modify the server application’s functionality to your specific requirements. Simply add or alter this line in the /etc/ssh/sshd config file to make your OpenSSH server display the contents of the /etc/ file as a pre-login banner: Banner /etc/ Here are some examples of configuration directives that you can modify:Ĭhange the Port directive in OpenSSH so that it listens on TCP port 2222 instead of the default TCP port 22: Sudo chmod a-w /etc/ssh/sshd_config.originalĪdditionally, because losing an ssh server could mean losing access to a server, double-check the settings after making changes and before restarting the server: Sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.original This way, you’ll have the original settings to refer to and reuse as needed.Ĭopy the /etc/ssh/sshd config file to a terminal prompt and secure it from writing with the following commands: Make a copy of the original configuration file and protect it from writing before altering it. Examples of configuration directives that can be altered by modifying the /etc/ssh/sshd config file are listed below. The sshd configuration file contains a number of directives that regulate things like communication settings and authentication modes. You can visit the corresponding manual page for details about the configuration directives used in this file by using the following command at a terminal prompt: Sudo apt install openssh-server How to Configure OpenSSH?īy changing the file /etc/ssh/sshd config, you can change the default behaviour of the OpenSSH server application, sshd. Use the following command at a terminal prompt to install the OpenSSH server application and necessary support files:
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