Jack Wallen offers tips for securing Linux that you can take care of in five minutes or less. SSH is a tool I use every single day to log into remote Linux servers and take care of my admin tasks.

The Linux screen command can be a life-saver when you need to ensure long-running tasks don't get killed when an SSH session is interrupted. Here's how to use it. If you’ve ever had to restart a ...

Using a set of public/private keys to allow you to log into a remote Linux system or run commands using ssh without a password can be very convenient, but setup is just tad tricky. Here's how and a ...

There’s a command line tool for running multiple commands on multiple Linux servers at once. Jack Wallen shows you how with Parallel-SSH. If you’re an administrator of multiple Linux machines in your ...

SSH provides remote, text-based access to Unix systems. It is a secure replacement for Telnet, with several additional features. Pre-requisites for remote access Duo: You will need to have Duo set up.

SSH is the descendant of rsh and rlogin, which are non-encrypted programs for remote shell logins. Rsh and rlogin, like telnet, have a long lineage but now are outdated and insecure. However, these ...

OpenBSD has recently stressed to us the value of key rotation by their use of “Signify” distribution release signatures. We have realized that SSH keys should also rotate, to reduce the risk of ...