$ id vivek Test sudo access and disable root login for ssh Use the usermod command to add the user named vivek to the wheel group: Verify group membership with id command $ id vivek How to add vivek user to sudo group on a CentOS/RHEL serverĪllows people in group wheel to run all commands on a CentOS/RHEL and Fedora Linux server. How to add vivek user to sudo group on a Debian/UbuntuĪllow members of group sudo to execute any command.

For example, allow vivek user to login as root using the sudo command. SSH Public Key Based Authentication on a Linux/Unix serverīefore we disable root user login, make sure regular user can log in as root.

How to upload ssh public key to as authorized_key using Ansible DevOPS tool.How To Setup SSH Keys on a Linux / Unix System.sshpass: Login To SSH Server / Provide SSH Password Using A Shell Script.keychain: Set Up Secure Passwordless SSH Access For Backup Scripts.$ ssh more info on ssh public key auth see: Verify that ssh key based login working for you: $ ssh-copy-id -i /path/to/public-key-file ssh-copy-id ssh-copy-id promoted supply user password. Next, install the public key using ssh-copy-id command: $ ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa_aws_$(date +%Y-%m-%d) -C 'AWS key for abc corp clients' $ ssh-keygen -t ed25519 -C 'Login to production cluster at xyz corp' $ ssh-keygen -t key_type -b bits -C 'comment' RSA keys are chosen over ECDSA keys when backward compatibility is a concern with ssh clients. First, create the key pair using following ssh-keygen command on your local desktop/laptop:ĭSA and RSA 1024 bit or lower ssh keys are considered weak. It is recommended that you use public key based authentication. OpenSSH server supports various authentication. User private/pub keys and client config – $HOME/.ssh/ directory.Client config file – ssh_config (located in /etc/ssh/).Server config file – sshd_config (located in /etc/ssh/).

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