Linux Magazine的November 2020目录

Linux Magazine www.linux-magazine.com ADMIN HPC http://www.admin-magazine.com/HPC/ SMART Devices • Jeff Layton Most storage devices have SMART capability, but can it help you predict failure? We look at ways to take advantage of this builtin monitoring technology with the smartctl utility from the Linux smartmontools package. ADMIN Online http://www.admin-magazine.com/ Cloud Security with AWS GuardDuty • Raul Lapaz Valeiras AWS GuardDuty uses machine learning and threat intelligence to identify malicious activity for continuous security monitoring in the cloud. Goodbye Google Cloud Print • Carsten Mickeleit With the discontinuation of Google Cloud Print, we look at printing going forward in the enterprise. Secrets and Certificate Management • Chris Binnie Vault is a highly secure, trusted place to keep your secrets and certificates.…

A Stone So Large … A lot of kernel patches just fix little things or make something slightly more convenient for system administrators and kernel developers. Recently, Joe Perches pointed out that the Arm architecture could conceivably invoke the Linux kernel with a command line that was longer than what printk() was able to output. So you could launch the kernel, but you couldn’t then go back and see exactly how you’d done it. He posted a patch to split long lines up so that printk() could output them. Sergey Senozhatsky liked the overall idea, but pointed out a bug in Joe’s code – he noted that printk() would also output a bit of prefix text, to let the user know what was being output. In this case, the prefix…

You are probably familiar with the large colored LED strips in many shop windows. Often these light strips use WS2812 RGB LEDs. Ready-made controllers are available, but they usually have a very limited feature set. In this article, I show you how to control a matrix of WS2812 LEDs with the Raspberry Pi. Power Games The WS2812 is a programmable RGB LED that is driven by a small controller that has a data byte for each of the three basic colors (red, green, and blue). This arrangement makes it possible to display more than 16 million colors with one LED. Each LED has four connections: two for the 5V power supply and two (DI, data in, and DO, data out) for asynchronous serial data transmission. The output of one LED…

Many power users believe they can manage connections more effectively from the command prompt, but a graphical interface offers several benefits. Snowflake is a graphically-based SSH terminal that comes with built-in SFTP support. This article describes how to set up secure connections and transfer files with Snowflake. But first a note: Now that Snowflake has started to gain some traction around the world, the developers have decided to change the name (a timehonored open source prerogative). The tool is now called Muon, but many references to it online, including the official project documentation and even the GitHub page, still refer to it as Snowflake, so I’ll call it Snowflake for this article. The documentation will probably update over time, so if you have trouble tracking down Snowflake by the time…

Issue 241 Issue 241 / December 2020 Approximate On Sale Date UK / Europe Nov 07 USA / Canada Dec 04 Australia Jan 04 Preview Newsletter The Linux Magazine Preview is a monthly email newsletter that gives you a sneak peek at the next issue, including links to articles posted online. Sign up at: https://bit.ly/Linux-Update…

Everyone who works professionally with Linux is used to building software from the source code, perhaps implementing small changes, automating routine work with shell scripts, or developing their own software in one of the many current programming languages. Tinkering with your own, completely new operating system, on the other hand, is a pretty unusual pastime. If you start from scratch, it will take a long time before your system is useful for anything. If you are looking for a challenging amateur project (for example, if you are a computer science student) or you want a better understanding of the theoretical basics of interrupts, memory management, scheduling, and other OS features, working on your own kernel can provide valuable insights. Linus Torvalds actually created Linux through a similar tinkering project. In…

Ajenti [1], an open source, webbased system control panel, lets you manage several important server management tasks with very little overhead. Think of it as a lightweight version of Webmin [2], the popular web-based administration tool. You can use Ajenti for basic server monitoring, installing and removing packages, as well as managing services, the network, and more. It’ll also help you remotely manage files on your server without firing up a terminal. In fact, if you want to get to the console, Ajenti will also give you a command-line interface inside the web browser itself. The two Ajenti branches currently under development are Ajenti 2 and Ajenti V. Ajenti 2 offers a new lightweight interface developed with Python 3 and AngularJS. Ajenti V is a plugin that adds web hosting…

Changing the password regularly, about every 60 or 90 days, is now considered obsolete. It is better to use a separate strong password for each service and each login. The requirement for how strong (i.e., how complicated) a password must be is something that – at least on your own systems – you can define yourself. On my test machine with Ubuntu, I can use almost any simple password I want – that has to change. To make This line can remain as a fallback, but in front of it – and this is important – I need to insert the line from Listing 1. This is a single line, which I just wrapped for Listing 1 to improve readability. With the individual parameters (Table 1 breaks them down), the…

Order online: https://bit.ly/Linux-Newsstand #239/October 2020 Build an IRC Bot IRC bots do the essential work of coordinating and forwarding chat messages on the Internet. This month we show you how to build your own custom bot – and we give you an inside look at how to work directly with IRC. On the DVD: Debian 10.5 and Devuan 3.0 #238/September 2020 Speed Up Your System Your Linux experience goes much more smoothly if your system is running at peak performance. This month we focus on some timely tuning techniques, including the kernel’s new Pressure Stall Information (PSI) feature. On the DVD: Bodhi Linux 5.1 and openSUSE Leap 15.2 #237/August 2020 Webcams and Linux This month we explore webcams, screencasting, and a cool teleprompter tool. We also look at PHP Building…

Lenovo kicked off the Summer of 2020 by claiming it would certify both their ThinkPad and ThinkStation hardware lines for Linux. The hardware giant is making good on that promise and is now offering a laptop preloaded with Fedora Linux. At the moment, there’s only one device offered with Fedora. Said device is the ThinkPad X1 Carbon Gen 8 (https://www.lenovo.com/us/en/laptops/thinkpad/thinkpad-x1/X1-Carbon-Gen-8-/p/20U9CTO1WWENUS2/customize). The base price of this laptop is $2,145, but with the coupon THINKPROMO that price is cut to $1,287. The base model includes a 10th Generation Intel Core i5-10210U CPU (1.60GHz) with 4 Cores, 8 Threads, and a 6MB cache, 8GB of LPDDR3 RAM, 256GB PCIe SSD, 14.0-inch FHD (1920x1080) IPS anti-glare display, a 720p HD camera, Intel Wi-Fi 6, and a fingerprint reader. Of course, you can configure up…

Linus Torvalds said that the Linux Kernel 5.8 was the largest release of all time. Although the vast majority of the changes to the kernel was code cleanup, there were a number of additions to the supported hardware and even some new features. But due to the size of this new kernel, one would have thought it might have taken considerable time for the likes of VirtualBox to come out with support. That is not the case. With the release of VirtualBox 6.1.14, the newest kernel is officially supported. This means you can not only run VirtualBox on Linux distribution hosts that use the 5.8 kernel, you can also run those same distributions as guest virtual machines. But don’t think the 6.1.14 maintenance release is only about supporting the new…

Get the latest news in your inbox every two weeks Subscribe FREE to Linux Update bit.ly/Linux-Update Linus Torvalds (the creator of Linux) has called the 5.8 kernel (https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.8.tar.xz) the “Biggest release of all time.” That kernel is now available for installation. The majority of the 5.8 kernel is code cleanup, driver support, security improvements, and low-level optimizations, which translates into not a lot of user-facing features. To put this into perspective, Torvalds said this: “But again, 5.8 is up there with the best, despite not really having any single thing that stands out. Yes, there’s a couple of big driver changes (habanalabs and atomisp) that are certainly part of it, but it’s not nearly as one-sided as some of the other historical big releases have been.” Some of the new…

The word “serial” in terms of computers might bring several things to mind. In modern times, it might be the universal serial bus (USB). Not too long ago, it might have brought to mind a 9-pin connector on the back of your desktop – or the even bigger 25-pin connector a bit before that. Different, still, the term might bring up memories of modems, printers, or peripherals connected to specialty computers. If you look at early mainframes, the serial port was the main interface to a text terminal and thus the human interface to the computer. Some of these usages have been superseded by newer or different technologies, but serial is still alive and well. Although not as common on today’s computer equipment, serial communication is far from gone, and…

Jon “maddog” Hall is an author, educator, computer scientist, and free software pioneer who has been a passionate advocate for Linux since 1994 when he first met Linus Torvalds and facilitated the port of Linux to a 64-bit system. He serves as president of Linux International®. Old Friends and Future Programmers Recently three things happened: the celebration of my 70th birthday, a Facebook discussion about songs of the mid-1960s, and the response to a birthday wish. Being 70 years old has various consequences. I do not run up the stairs as quickly as I did when I was 18. I typically go to sleep earlier and get up later. I take a lot of pills to keep alive – not the fun stuff we may have done when we were…

Sparkling gems and new releases from the world of Free and Open Source Software Photo management One of the biggest compromises you make when you forgo the privacy infringement of online photo storage is convenience. Not only is online storage usually limitless and cheap, it’s typically combined with the same clever AI-generated search metadata that drives whatever online platform you choose. Google, Apple and Amazon, for example, all silently trawl through your uploaded photos to recognize common items, colors, locations, situations, and of course, faces. This can really help you find a single image in a collection that might have started over a decade ago, and it’s a process that can’t be easily replicated on a local machine with local storage and no access to the cloud. Until now. DigiKam…

Users, developers, and vendors meet at Linux events around the world. We at Linux Magazine are proud to sponsor the Featured Events shown here. For other events near you, check our extensive events calendar online at https://www.linux-magazine.com/events. If you know of another Linux event you would like us to add to our calendar, please send a message with all the details to events@linux-magazine.com. NOTICE Be sure to check the event website before booking any travel, as many events are being canceled or converted to virtual events due to the effects of COVID-19. The eighth year of All Things Open Date: October 19-20, 2020 Location: Virtual Event Website: https://2020.allthingsopen.org/ The eight year of the All Things Open conference promises to be the best year yet as we will host a virtual event…

We are always looking for good articles on Linux and the tools of the Linux environment. Although we will consider any topic, the following themes are of special interest: • System administration • Useful tips and tools • Security, both news and techniques • Product reviews, especially from real-world experience • Community news and projects If you have an idea, send a proposal with an outline, an estimate of the length, a description of your background, and contact information to edit@linux-magazine.com. The technical level of the article should be consistent with what you normally read in Linux Magazine. Remember that Linux Magazine is read in many countries, and your article may be translated into one of our sister publications. Therefore, it is best to avoid using slang and idioms that…