Administration Section
Introduction to Operating Systems Hello, Habr! I would like to present to your attention a series of translated articles on literature that I find interesting — OSTEP. This material explores in depth the workings of Unix-like operating systems, specifically focusing on processes, various schedulers, memory, and other similar components that make up a modern OS. You can view the original materials here. […]
If you use a time series database (timeseries db, wiki) as the main storage for a site with statistics, you might end up with a lot of headaches instead of a solution. I am working on a project that uses such a database, and sometimes InfluxDB, which I will discuss, brought unexpected surprises. Disclaimer: the issues mentioned apply to version InfluxDB 1.7.4. Why time series? The project […]
Documentation! When you decide to write your own hook-catching bicycle from Docker Hub or from the registry for automatic container updates or startup on the server, you might find the Docker CLI useful, which will help manage the Docker daemon in your system. You will need Go version 1.9.4 or higher. If you haven't switched to modules yet, install the CLI with the following command: […]
On June 17 (Monday), the second annual Tarantool Conference, or simply T+ Conf, will take place at the Mail.ru Group office. It is aimed at both beginners and experienced developers and architects in the corporate sector. Expect new talks and workshops on using in-memory computing, Tarantool / Redis / Memcached, cooperative multitasking, and the Lua language for building high-load fault-tolerant […]
About a year ago, on April 3, 2018, the Federal Service for Technical and Export Control of Russia published Order No. 55. It approved the Regulations on the information protection means certification system. This defined who is a participant in the certification system. It also clarified the organization and procedure for certifying products designed to protect confidential information that constitutes state secrets, with the means of protection also needing to be certified through the specified system. […]
Hello again! Classes in the new group of the "Linux Administrator" course begin tomorrow, so we are publishing a useful article on the topic. In the previous tutorial, we covered how to use pam_cracklib to strengthen passwords in Red Hat 6 or CentOS systems. In Red Hat 7, pam_pwquality replaced cracklib as the default pam module for validation […]
This article is a continuation of the previous material dedicated to the features of configuring Palo Alto Networks equipment. Here, we want to discuss setting up IPSec Site-to-Site VPN on Palo Alto Networks hardware and a possible configuration option for connecting multiple Internet service providers. A standard scheme connecting the head office to a branch office will be used for demonstration. To ensure a fault-tolerant Internet connection, […]
Practical examples of SSH that will elevate your remote system administrator skills. Commands and tips will help not only to use SSH but also to navigate the network more effectively. Knowing a few SSH tricks is beneficial for any system administrator, network engineer, or security specialist. Practical SSH examples SSH socks proxy SSH tunneling (port forwarding) SSH tunnel to a third host […]
"Secure Shell" (SSH) is a network protocol for establishing a secure connection between hosts, typically over port 22 (which is better changed). SSH clients and SSH servers are available for most operating systems. Inside SSH, nearly any other network protocol can operate, meaning you can work remotely on another computer, transmit audio or video streams over an encrypted channel, etc. Additionally, through […]
Despite the many advantages of Palo Alto Networks firewalls, there is surprisingly little material available online about configuring these devices or texts that describe experiences with their implementation. We decided to compile the materials we've accumulated over time while working with this vendor's equipment and share the features we encountered during various projects. To get acquainted with […]
How the transformation of Wireless Edge will aid in the development of photorealistic mobile augmented reality systems. Augmented Reality (Extended Reality, XR) already offers users revolutionary capabilities, but achieving even greater realism and a new level of immersion, considering the limitations related to the performance and cooling of thin portable gadgets, is quite a challenge. A look into the future: sleek and stylish augmented reality glasses […]
Why cryptography? I have only a superficial understanding of it. Yes, I read Bruce Schneier's classic work, but that was a long time ago; yes, I understand the difference between symmetric and asymmetric encryption, I know what elliptic curves are, but that's about it. Moreover, the existing cryptographic libraries, with their charming practice of including the full name of the algorithm in each function name […]