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  • tnt4brain February 22, 2021 at 04:42 PM

    Improving Ansible

    • System administration,
    • Python,
    • *nix,
    • Server Administration,
    • DevOps
    • Translation

    Let's once again improve Ansible. Well, this won't work without getting into sources.

    Take the action
    • +2
    • 600
    • Comment
  • Shapelez November 9, 2020 at 04:44 PM

    Linux Switchdev the Mellanox way

    • Qrator Labs corporate blog,
    • System administration,
    • Network technologies,
    • Network hardware
      This is a transcription of a talk that was presented at CSNOG 2020 — video is at the end of the page



      Greetings! My name is Alexander Zubkov. I work at Qrator Labs, where we protect our customers against DDoS attacks and provide BGP analytics.

      We started using Mellanox switches around 2 or 3 years ago. At the time we got acquainted with Switchdev in Linux and today I want to share with you our experience.
      Read more →
      • +18
      • 958
      • Comment
    • Firemoon June 18, 2020 at 04:32 PM

      Starting the server

      • Selectel corporate blog,
      • System administration

        Even the most experienced and highly qualified system administrators often have only a vague idea of what exactly happens during the server startup process. So, let's look at this process in detail.
        Read more →
        • +6
        • 1.4k
        • Comment
      • Darksa May 15, 2020 at 04:22 PM

        The magic of Virtualization: Proxmox VE introductory course

        • Selectel corporate blog,
        • System administration

          Today, I am going to explain how to quickly deploy several virtual servers with different operating systems on a single physical server without much effort. This will enable any system administrator to manage the whole corporate IT infrastructure in a centralized manner and save a huge amount of resources.
          Read more →
          • +9
          • 984
          • Comment
        • Please pay attention

        • ultral May 4, 2020 at 03:24 PM

          Ansible: CoreOS to CentOS, 18 months long journey

          • System administration,
          • Server Administration,
          • Monetization of IT systems,
          • DevOps,
          • Systems engineering


            There was a custom configuration management solution.


            I would like to share the story about a project. The project used to use a custom configuration management solution. Migration lasted 18 months. You can ask me 'Why?'. There are some answers below about changing processes, agreements and workflows.

            Read more →
            • +3
            • 615
            • 2
          • ultral May 3, 2020 at 04:33 PM

            How to test Ansible and don't go nuts

            • IT systems testing,
            • System administration,
            • IT Infrastructure,
            • DevOps,
            • Systems engineering


              It is the translation of my speech at DevOps-40 2020-03-18:


              After the second commit, each code becomes legacy. It happens because the original ideas do not meet actual requirements for the system. It is not bad or good thing. It is the nature of infrastructure & agreements between people. Refactoring should align requirements & actual state. Let me call it Infrastructure as Code refactoring.

              Read more →
              • +3
              • 988
              • Comment
            • timurxyz April 28, 2020 at 04:24 PM

              Safe-enough linux server, a quick security tuning

              • Information Security,
              • System administration,
              • *nix,
              • Cloud computing,
              • Server Administration
              • From sandbox
              • Tutorial
              The case: You fire up a professionally prepared Linux image at a cloud platform provider (Amazon, DO, Google, Azure, etc.) and it will run a kind of production level service moderately exposed to hacking attacks (non-targeted, non-advanced threats).

              What would be the standard quick security related tuning to configure before you install the meat?


              release: 2005, Ubuntu + CentOS (supposed to work with Amazon Linux, Fedora, Debian, RHEL as well)


              image

              Read more →
              • +5
              • 1.5k
              • Comment
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            • msgeek December 4, 2019 at 10:00 AM

              Windows Terminal Preview v0.7 Release

              • Microsoft corporate blog,
              • System administration,
              • GitHub,
              • Development for Windows
                Another release is out for the Windows Terminal preview! This release is labeled as v0.7 in the About section of the Terminal. As always, you can download the Terminal from the Microsoft Store and from the GitHub releases page. Here’s what’s new in this release:

                Windows Terminal Updates


                Panes


                You are now able to split your Terminal window into multiple panes! This allows you to have multiple command prompts open at the same time within the same tab.

                Note: At the moment, you’re only able to open your default profile within a new pane. Opening a profile of your choice is an option we’re planning to include in a future release!



                Read more below.
                Read more →
                • +3
                • 1.2k
                • Comment
              • msgeek November 4, 2019 at 10:00 AM

                Windows Terminal Preview 1910 Release

                • Microsoft corporate blog,
                • System administration,
                • Development for Windows
                  Another update to the Windows Terminal has just been released! As always, you can download the Terminal from the Microsoft Store, the Microsoft Store for Business, and GitHub.

                  Note: In the About popup within the Terminal, this version will appear as v0.6.

                  Read more →
                  • +7
                  • 1.2k
                  • Comment
                • kashtan404 May 28, 2019 at 10:06 AM

                  Connect to Windows via SSH like in Linux

                  • System administration,
                  • PowerShell,
                  • Server Administration,
                  • DevOps
                  • Tutorial
                  The most depressing thing for me is to connect to Windows hosts. I'm not an opponent or a fan of Microsoft and their's products. Every product has its own purpose. But it is really painful for me to connect to Windows servers, because of 2 points: it is hard to configure (Hi WinRM with HTTPS), and it is really unstable (Hello RDP to VMs across the ocean).

                  Fortunately, I found the project Win32-OpenSSH. I realized that I want to share my experience with it. I believe it will help somebody and save a lot of nerves.


                  Read more →
                  • +6
                  • 6.9k
                  • Comment
                • dominigato May 27, 2019 at 08:59 AM

                  Speed up Ansible with Mitogen

                  • System administration,
                  • DevOps
                  • Tutorial

                  Speed up Ansible with Mitogen!


                  → Russian version


                  Ansible is one of most popular Configuration Management Systems nowadays. After it was acquired by Red Hat in 2015 Ansible has reached numbers of thousands of contributors and became maybe one of most used deployment and orchestration tools. Its use-cases are quite impressive.


                  Ansible works by SSH connections to remote hosts. It opens SSH session, logs in to the shell, copy python code via network and create a temporary file on remote hosts with this code. In the next step, it executes the current file with python interpreter. All this workflow is pretty heavy and there are multiple ways to make it faster and lighter.

                  Read more →
                  • +4
                  • 3.8k
                  • Comment
                • gmorfy May 23, 2019 at 04:26 PM

                  Who is stealing virtual CPU time?

                  • Mail.ru Group corporate blog,
                  • Configuring Linux,
                  • System administration,
                  • Virtualization


                    Hi! In this article, I want to explain, in layman’s terms, how steal appears in VMs and tell you about some of the less-than-obvious artifacts that we found during research on the topic that I was involved in as CTO of the Mail.ru Cloud Solutions platform. The platform runs KVM.
                    Read more →
                    • +32
                    • 7.1k
                    • 2
                  • dominigato May 19, 2019 at 07:01 PM

                    Docker container for HP servers management with ILO

                    • System administration,
                    • IT Infrastructure,
                    • Server Administration,
                    • DevOps
                    • Tutorial
                    Origin in Russian

                    Well, you can wonder — why would I use docker container for such a purpose? What's the problem to enter web-interface of ILO and manage server as usual?

                    The same thought I had when I've got a few old servers that required a reprovision. The servers are located in different continent and the only interface I had it was just a web interface of ILO. And when I had to enter a few manual commands via Virtual Console I discovered that it's hardly possible.

                    For various sorts of Virtual Console of servers (both HP and Dells) usually Java web applets are used. But Firefox and Chrome don't support them anymore and the newest IcedTea doesn't work with those old system anyway. So I had a few options:
                    Read more →
                    • +7
                    • 1.4k
                    • Comment
                  • pprometey April 24, 2019 at 07:49 AM

                    Free Wireguard VPN service on AWS

                    • Information Security,
                    • Open source,
                    • System administration,
                    • IT Infrastructure,
                    • Network technologies
                    • Translation
                    • Tutorial

                    Free Wireguard VPN service on AWS


                    The reasoning


                    The increase of Internet censorship by authoritarian regimes expands the blockage of useful internet resources making impossible the use of the WEB and in essence violates the fundamental right to freedom of opinion and expression enshrined in the Universal Declaration of Human Rights.


                    Article 19
                    Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers.

                    The following is the detailed 6 steps instruction for non-IT people to deploy free* VPN service upon Wireguard technology in Amazon Web Services (AWS) cloud infrastructure, using a 12 months free account, on an Instance (virtual machine) run by Ubuntu Server 18.04 LTS.


                    I tried to make this walkthrough as friendly as possible to people far from IT. The only thing required is assiduity in repeating the steps described below.

                    Read more →
                    • +3
                    • 34.8k
                    • Comment
                  • kashtan404 April 11, 2019 at 09:44 AM

                    Splunk Universal Forwarder in the Docker as a system logs gatherer

                    • System administration,
                    • Server Administration,
                    • DevOps
                    • Tutorial


                    Splunk is the most known commercial product to gather and analyze logs. Even now, when Splunk has stopped sales in the Russian Federation. And that's not a reason not to write the how-to articles about this product.
                    Read more →
                    • +6
                    • 2.6k
                    • Comment
                  • saboteur_kiev March 23, 2019 at 02:45 AM

                    Dozen tricks with Linux shell which could save your time

                    • Configuring Linux,
                    • System administration,
                    • Programming,
                    • Shells


                      • First of all, you can read this article in russian here.

                      One evening, I was reading Mastering regular expressions by Jeffrey Friedl , I realized that even if you have all the documentation and a lot of experience, there could be a lot of tricks developed by different people and imprisoned for themselves. All people are different. And techniques that are obvious for certain people may not be obvious to others and look like some kind of weird magic to third person. By the way, I already described several such moments here (in russian) .

                      For the administrator or the user the command line is not only a tool that can do everything, but also a highly customized tool that could be develops forever. Recently there was a translated article about some useful tricks in CLI. But I feel that the translator do not have enough experience with CLI and didn't follow the tricks described, so many important things could be missed or misunderstood.

                      Under the cut — a dozen tricks in Linux shell from my personal experience.
                      Read more →
                      • +12
                      • 7.2k
                      • Comment
                    • ashotog March 10, 2019 at 10:48 AM

                      How to Discover MongoDB and Elasticsearch Open Databases

                      • Information Security,
                      • Search engines,
                      • System administration,
                      • Database Administration

                        Some time ago among security researchers, it was very “fashionable” to find improperly configured AWS cloud storages with various kinds of confidential information. At that time, I even published a small note about how Amazon S3 open cloud storage is discovered.


                        However, time passes and the focus in research has shifted to the search for unsecured and exposed public domain databases. More than half of the known cases of large data leaks over the past year are leaks from open databases.



                        Today we will try to figure out how such databases are discovered by security researchers...

                        Read more →
                        • +16
                        • 11.4k
                        • Comment
                      • sukhe January 29, 2019 at 04:02 PM

                        A small notebook for a system administrator

                        • System administration,
                        • Prototyping,
                        • Design,
                        • Gadgets,
                        • Laptops
                          I am a system administrator, and I need a small, lightweight notebook for every day carrying. Of course, not just to carry it, but for use it to work.

                          I already have a ThinkPad x200, but it’s heavier than I would like. And among the lightweight notebooks, I did not find anything suitable. All of them imitate the MacBook Air: thin, shiny, glamorous, and they all critically lack ports. Such notebook is suitable for posting photos on Instagram, but not for work. At least not for mine.

                          After not finding anything suitable, I thought about how a notebook would turn out if it were developed not with design, but the needs of real users in mind. System administrators, for example. Or people serving telecommunications equipment in hard-to-reach places — on roofs, masts, in the woods, literally in the middle of nowhere.

                          The results of my thoughts are presented in this article.

                          Figure to attract attention
                          Read more →
                          • +85
                          • 140k
                          • 57
                        • gree-gorey January 27, 2019 at 12:58 PM

                          Writing yet another Kubernetes templating tool

                          • System administration,
                          • Python,
                          • Server Administration,
                          • DevOps,
                          • Kubernetes


                            If you are working with Kubernetes environment then you probably make use of several existing templating tools, some of them being a part of package managers such as Helm or Ksonnet, or just templating languages (Jinja2, Go template etc.). All of them have their own drawbacks as well as advantages and we are going to go through them and write our own tool that will try to combine the best features.

                            Read more →
                            • +20
                            • 8.4k
                            • 1
                          • ultral January 24, 2019 at 08:07 AM

                            About monitoring

                            • System administration,
                            • Server Administration,
                            • DevOps

                              intro


                              Monitoring is the most important part of your infrastructure. Monitoring is system engineers basics. However, everyone has his own way to understand it. My way consist of denial. anger & acceptance.

                              Read more →
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