Category Archives: Tutoriale Linux

Linux pmap Command Tutorial for Beginners (5 Examples) | Linux.com


Linux command line offers a lot of tools that help you know more about processes that are currently active in your system. One such utility is pmap, which reports the process memory map. In this tutorial, we will discuss the basics of pmap using some easy to understand examples.

But before we do that, it’s worth mentioning all examples here have been tested on an Ubuntu 18.04 LTS machine.

Linux pmap command

The pmap command in Linux lets you see the memory map of one or more than one processes. Following is its syntax:

pmap [options] pid […]

And here’s how the tool’s man page explains it:

The pmap command reports the memory map of a process or processes.

Read more at HowToForge

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How to Create SSH Tunneling or Port Forwarding in Linux | Linux.com


SSH tunneling (also referred to as SSH port forwarding) is simply routing local network traffic through SSH to remote hosts. This implies that all your connections are secured using encryption. It provides an easy way of setting up a basic VPN (Virtual Private Network), useful for connecting to private networks over unsecure public networks like the Internet.

You may also be used to expose local servers behind NATs and firewalls to the Internet over secure tunnels, as implemented in ngrok.

SSH sessions permit tunneling network connections by default and there are three types of SSH port forwarding: local, remote and dynamic port forwarding.

In this article, we will demonstrate how to quickly and easily setup a SSH tunneling or the different types of port forwarding in Linux.

Read more at Tecmint

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How to Monitor Network Traffic with Linux and vnStat | Linux.com


If you’re a network or a Linux admin, sometimes you need to monitor network traffic coming and going to/from your Linux servers. As there are a number of tools with which to handle this task, where do you turn? One very handy tool is vnStat. With vnStat you get a console-based network traffic monitor that is capable of monitoring and logging traffic on selected interfaces for specific dates, times, and intervals. Along with vnStat, comes a PHP script that allows you to view network traffic of your configured interface via a web-based interface.

I want to show you how to install and use both vnStat and vnStat-PHP on Linux. I’ll demonstrate on Ubuntu Server 18.04, but the tool is available for most distributions.

Read more at TechRepublic

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Shared Storage with NFS and SSHFS | Linux.com


Up to this point, my series on HPC fundamentals has covered PDSH, to run commands in parallel across the nodes of a cluster, and Lmod, to allow users to manage their environment so they can specify various versions of compilers, libraries, and tools for building and executing applications. One missing piece is how to share files across the nodes of a cluster.

File sharing is one of the cornerstones of client-server computing, HPC, and many other architectures. You can perhaps get away without it, but life just won’t be easy any more. This situation is true for clusters of two nodes or clusters of thousands of nodes. A shared filesystem allows all of the nodes to “see” the exact same data as all other nodes. For example, if a file is updated on cluster node03, the updates show up on all of the other cluster nodes, as well.

Fundamentally, being able to share the same data with a number of clients is very appealing because it saves space (capacity), ensures that every client has the latest data, improves data management, and, overall, makes your work a lot easier. The price, however, is that you now have to administer and manage a central file server, as well as the client tools that allow the data to be accessed.

Although you can find many shared filesystem solutions, I like to keep things simple until something more complex is needed. A great way to set up file sharing uses one of two solutions: the Network File System (NFS) or SSH File System (SSHFS).

Read more at ADMIN Magazine

Deepin Linux: As Gorgeous As It Is User-Friendly | Linux.com


Deepin Linux. You may not have heard much about this distribution, and the fact that it’s often left out of the conversation is a shame. Why? Because Deepin Linux is as beautiful as it is user-friendly. This distribution has plenty of “wow” factor and very little disappointment.

For the longest time, Deepin Linux was based on Ubuntu. But with the release of 15.7, that all changed. Now, Deepin’s foundation is Debian, but the desktop is still that beautiful Deepin Desktop. And when I say it’s beautiful, it truly is one of the most gorgeous desktop environments you’ll find on any operating system. That desktop uses a custom-built QT5 toolkit, which runs as smoothly and with as much polish as any I’ve ever used. Along with that desktop, comes a few task-specific apps, built with the same toolkit, so the experience is consistent and integrated.

What makes the 15.7 release special is that it comes just two short months after the 15.6 release and is focused primarily on performance. Not only is the ISO download size smaller, many core components have been optimized with laptop battery performance in mind. To that end, the developers have gained up to 20 percent better battery life and a much-improved memory usage. Other additions to Deepin Linux are:

  • NVIDIA Prime support (for laptops with hybrid graphics).

  • On-screen notifications (for the likes of turning on or off the microphone and/or Wi-Fi).

  • New drag and drop animation.

  • Added power saving mode and auto-mode switching for laptops.

  • Application categories in mini mode.

  • Full disk installation.

For a full list of improvements and additions, check out the 15.7 Release notes.

Let’s install Deepin Linux and see just what makes this distribution so special.

Installation

In similar fashion to the desktop, the Deepin Linux installer is one of the most beautiful OS installers you will find (Figure 1). Not only is the installer a work of art, it’s incredibly simple. As with most modern Linux distributions, installing Deepin is only a matter of answering a few questions and clicking Next a few times.

Installation shouldn’t take more than 10 minutes tops. In fact, based on the download experience I had with the main download mirror, the installation will go faster than the ISO download. To that end, you might went to pick one of the following mirrors to snag a copy of Deepin Linux:

Once you’ve installed Deepin Linux, you can then log onto your new desktop.

First Steps

Upon first login, you’ll be greeted by a setup wizard that walks you through the configuration of the desktop (Figure 2).

In this wizard, you will be asked to configure the following:

Once you’ve select those options, you’ll find yourself on the Deepin Desktop (Figure 3).

Applications

The application list might surprise some users, especially those who have grown accustomed to certain applications being installed by default. What you’ll find on Deepin Linux is a list of applications that includes:

  • WPS Office

  • Google Chrome

  • Spotify

  • Deepin Store

  • Deepin Music

  • Deepin Movie

  • Steam

  • Deepin Screenshot

  • Foxit Reader

  • Thunderbird Mail

  • Deepin Screen Recorder

  • Deepin Voice Recorder

  • Deepin Cloud Print

  • Deepin Cloud Scan

  • Deepin Font Installer

  • ChmSee

  • Gparted

What the developers have done is to ensure users have as complete a desktop experience as possible, out of the box. In other words, most every average user wouldn’t have to bother installing any extra software for some time. And for those who question the choice of WPS Office, I’ve used it on plenty of occasions and it is quite adept at not only creating stand-alone documents, but collaborating with those who work with other office suites. The one caveat to that is WPS Office isn’t open source. However, Deepin Linux doesn’t promote itself as a fully open desktop, so having closed-source applications (such as the Spotify client and WPS Office) should surprise no one.

Control Center

Deepin takes a slightly different approach to the Control Center. Instead of it being a stand-alone, windowed application, the Control Center serves as a sidebar (Figure 4), where you can configure users, display, default applications, personalization, network, sound, time/date, power, mouse, keyboard, updates, and more.

Click on any one of the Control Center categories and you can see how well the developers have thought out this new means of configuring the desktop (Figure 5).

Hot Corners

The Deepin Desktop also has a nifty hot corners feature on the desktop. With this feature, you can set each corner to a specific action, such that when you hover your mouse over a particular corner, the configured action will occur. Available actions are:

  • Launcher

  • Fast Screen Off

  • Control Center

  • All Windows

  • Desktop

  • None

To set the hot corners, right-click on the desktop and select Corner Settings from the pop-up menu. You can then hover your cursor over one of the four corners and select the action you want associated with that corner (Figure 6).

A Must-Try Distribution

If you’re looking for your next Linux desktop distribution, you’d be remiss if you didn’t give Deepin Linux 15.7 a try. Yes, it is beautiful, but it’s also very efficient, very user-friendly, and sits on top of a rock solid Debian foundation. It’s a serious win-win for everyone. In fact, Deepin 15.7 is the first distribution to come along in a while to make me wonder if there might finally be a contender to drag me away from my long-time favorite distro… Elementary OS.

Learn more about Linux through the free “Introduction to Linux” course from The Linux Foundation and edX.