ssh directory in local computer terminal window: mkdir -p ~/.ssh & cd ~/.sshī.) Next, run command to generate a key pair: ssh-keygen -t ed25519 -f linode_ed25519 -C the code, you may replace “ed25519” with your prefer encryption algorithm. While RSA is widely used and best supported, ED25519 offers better security and good performance.Ī.) Firstly, create and navigate to the. The ssh-keygen command allows to generate a SSH key pair via RSA, ECDSA, and ED25519 algorithms. In case you don’t have it, run this command in local computer to install it: sudo apt install openssh-clientįor CentOS and Fedora, use sudo dnf install openssh openssh-clients instead. The OpenSSH client is installed out-of-the-box mostly. NOTE: this tutorial is tested on Ubuntu local computer, though it should work on most Linux, including Debian, Fedora, CentOS, and Arch Linux. By uploading the public key into remote Linux server, you’ll be able to SSH login using the private key in local machine. They are usually consists of private key and public key. The authentication keys are generated in local computers. Enable SSH Key Authentication (Run commands in local PC): And use -p port_number to specify the port number if it’s not the default 22.Ģ. If you see the service is active and running, you may start connecting the server via SSH remotely using the command below in local computer: ssh user and server_ip. You need to first connect to the server, and run command to install openssh: sudo apt install openssh-serverįor CentOS and Fedora server, use sudo dnf install openssh-server command instead.Īfter installation, enable and start the service via command: sudo systemctl enable ssh & sudo systemctl start sshĪnd finally verify the SSH service status by running command: sudo system status ssh In case you don’t have enabled the SSH service in remote server. Enable SSH Service (Do it in server side): It also make SSH connection simple by login without password. For those having Ubuntu or other Linux server (e.g., Debian, CentOS and Fedora) remotely, here’s how to login without password using SSH key authentication.Ĭompare to user password login, SSH key authentication is more secure because only the person who has the key allows to connect, and the keys are well encrypted by different algorithms.

Passwordless sudo ubuntu