It must be installed using: sudo dnf install traceroute The program traceroute is not part of Red Hat Enterprise Linux (RHEL) by default. Reports the route that a packet takes in hops to move through the Internet to reach its destination. Easily learn new technologies and coding concepts and quickly find the answers you need. With Red Hat Developer cheat sheets, you get essential information right at your fingertips so you can work faster and smarter. Commands for working with the Red Hat Enterprise Linux operating system:.Managing files and directories on Linux:.Working with disks, devices, and volumes on Linux:.Console and output management commands:. ![]() You’ll find tips on managing processes, users, and groups on Linux, as well as monitoring disk and network usage.ĭownload the Intermediate Linux Cheat Sheet to gain an enhanced understanding of: Subscribe to TechRepublic’s How To Make Tech Work on YouTube for all the latest tech advice for business pros from Jack Wallen.Ready to level up your Linux knowledge? This cheat sheet presents a collection of Linux commands and executables for developers and system administrators who want to move beyond the basics. Save the file and you’re ready to SSH into those machines with commands like:Īnd that’s all there is to creating an SSH config file to be used on macOS. You could then create each host configuration entry (below that), leaving out the User option, like so: Where USERNAME is the user on the remote machines. You could configure that at the top of the config file with two simple lines: Let’s say you use the same account on all of your data center servers on the IP address scheme 192.168.1.x. This makes it so much easier for you to remote into those servers from your Apple laptop or desktop. Just make sure, at a minimum, you include the Host and Hostname options. You can create as many configurations in that file as you need (one for every server in your data center), each with different options. To SSH into our Nextcloud server, you’d only have to type the command: If you’re not using SSH KEY authentication (which you should), you’d need to remove the IdentityFile line. We’re also going to enable key authentication for the connection. We’re going to name this server “nextcloud” so we can easily remember how to Secure Shell into it. For example, say this is a Nextcloud server at IP address 192.168.1.20 and the username is vega. In that directory, create the new file with the command: Once it opens, change into your user SSH directory with the command: With those at the ready, let’s make this happen. The only thing you’ll need is a MacBook or iMac that includes SSH and some remote servers to connect to. SEE: Identity theft protection policy (TechRepublic Premium) What you’ll need How do you do that on macOS? Let me show you. What if I told you that SSH can use a configuration file to make it much easier? By making use of the SSH configuration file, you can configure an entire data center worth of SSH connections such that you could issue a command: Ssh what happens if you remote into 10 or 20 different machines throughout the day, each with different usernames and IP addresses? That can get a bit confusing after a while. Open your macOS terminal app and issue a command like:Īs long as your usernames are the same on both ends, you’re good to go, but if your user names aren’t the same, that command might look like: Generally speaking, SSH is quite easy to use. You probably use SSH to connect to remote machines for admin purposes. Jack Wallen shows you how to make SSH connections even easier from your macOS machine. ![]() How to use an SSH config file on macOS for easier connections to your data center servers
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