This is for security and resource conservation reasons. It is usually terminated when a user session is over, or when an application using SSH client-to-server connectivity is finished. The SSH client program is started only when used, and can be left on. At system boot time, the SSH server starts, listens continuously for connections, and is controlled by an application that manages always-on applications, called systemd. The SSH client and the SSH server are two different programs. Upon each Linode Ubuntu 20.04 LTS initial provisioning, keys for the SSH client are generated, making the SSH client application immediately available for use. The SSH server is dormant, and must be enabled. These could be a shell/terminal access to the host running the SSH server software, or other applications such as scp or rsync.Īll Linode Ubuntu instances contain the SSH client software and an SSH server. The SSH server manages the communications services for client requests. SSH client connection services can be called by other applications for use as an authenticated and encrypted network between hosts. The SSH client is usually used to achieve shell/terminal sessions on another host running the SSH server. The SSH connection between hosts is requested by an SSH client (or application). The Secure SHell protocol securely connects two hosts using authentication. If you’re not familiar with the sudo command, see the Users and Groups guide. Commands that require elevated privileges are prefixed with sudo. This guide is written for a non-root user.
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