Updated Wednesday, October 7, , by Linode. In the Getting Started guide, you learned how to deploy a Linux distribution, boot your Linode and perform basic administrative tasks. Keeping your software up to date is the single biggest security precaution you can take for any operating system. Software updates range from critical vulnerability patches to minor bug fixes, and many software vulnerabilities are actually patched by the time they become public. There are arguments for and against automatic updates on servers.
How Does SSH Server Work?
SSH is actually a suite of three utilities - slogin, ssh, and scp - that are secure versions of the earlier UNIX utilities, rlogin, rsh, and rcp. SSH commands are encrypted and secure in several ways. In short, SSH allows you to connect to your server securely to perform Linux command-line operations. To get started, please visit your Server Guide in the Account Center , and make sure you have the following information ready:. You will need to set your root password in the Account Center the first time you connect to your server. For security reasons, your Grid comes with SSH access disabled by default. Here are instructions for enabling SSH access:. This is the only Grid SSH user with wide-reaching permissions. Choose the appropriate one for your needs.
SSH is a protocol for securely exchanging data between two computers over an untrusted network. SSH protects the privacy and integrity of the transferred identities, data, and files. It runs in most computers and in practically every server. The SSH protocol and SSH keys secure hundreds of millions of maintenance sessions, file transfers, and automated processes - every day. The SSH client always initiates the setup of the secure connection, and the SSH server listens for incoming connection requests usually on TCP port 22 on the host system and responds to them. In the connection setup phase, the SSH server authenticates itself to the client by providing its public key. This allows the SSH client to verify that it is actually communicating with the correct SSH server instead of an attacker that could be posing as the server.
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