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Although it covers topics as advanced as Beowulf clusters, it provide no depth whatsoever. I pray no one tries to set up a cluster after reading the couple of pages this book devotes to it, or anything else in Debian for that matter. I got a couple of little tidbits from this book, but not really enough to make it worth reading.
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Debian Administrator’s Handbook
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Debian 7: System Administration Best Practices
How do I publish content on my topic? Easy to do! How to grow my audience and develop my traffic? Publishing quality and relevant content you curate on a regular basis will develop your online visibility and traffic. Why should I share my scoops? Sharing your scoops to your social media accounts is a must to distribute your curated content. Not only will it drive traffic and leads through your content, but it will help show your expertise with your followers. Your feedback is welcome. Typically administration is done by using an SSH client from a workstation.
If you are on Windows, then often you will be using something like Putty. When it comes to the security of the SSH configuration, it is the server part that is the most interesting. For example, is that the server can decide if normal password based logins are allowed or denied. Even if the client has a preference, it is the server to make the final call.
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Settings can also be specified during the connection by providing a command-line option. The web is full of blogs and guides that state they are using so-called best practices. A best practice is an effective and good approach and typically agreed on by the experts and by consensus. Unfortunately, many of the blogs and articles are simple copies from other blogs and without the extensive research. If you see just configuration settings without a good explanation, be careful with applying such changes.
Some are outdated or simply not relevant. What is the purpose of setting some value when it is already the default or even removed? So use best practices, but always test your changes.
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Is this the first time you will change your SSH configuration? Check the status of the SSH daemon and see if the related service is started on boot. When using a distribution with systemd, make sure the daemon is running and enabled. If you make changes to your SSH configuration, it makes sense to restart the service. This can be done by using the test mode flag. This additional step ensures the syntax and options are correct before you end up with a nonfunctioning service. This command should not return any text or errors. Here is an example when something does not look good:.
Are you connected to the system with SSH and making changes to its configuration? Do not to send this to any of the child processes, or you will be disconnected. Another option is to temporarily run another SSH process on another port, without becoming a daemon process. Specify the full path and use -D together with the -p for the port number. Then ensure that you can access the temporary connection, especially if you are using a firewall with traffic filtering. While it makes sense to do a full deployment of your new SSH configuration to all systems, you might want to be careful.
So have a look at the oldest Linux distributions that are used to get an idea on compatibility issues. Before applying changes or restarting the daemon, check for any active SSH connections. This can be done with the ss tool. Any established TCP connection will be displayed. By using both dport and sport , we can confirm what connections are active in both directions.
After that is done, it is good to know that each OpenSSH version has its own defaults. New features may have been added, older settings may have disappeared.
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