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Full multi-tenancy in Zimbra OSE with Zextras Admin

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Multitenancy is currently one of the most effective models for delivering IT services. A single instance of an application, running on a single server infrastructure but accessible to numerous users and businesses, allows for a significant reduction in the cost of IT service provision while achieving the highest quality. The architecture of the Zimbra Collaboration Suite Open-Source Edition was originally designed with the concept of multitenancy in mind. As a result, […]

OTUS. Our favorite mistakes

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Two and a half years ago, we launched the Otus.ru project, and I wrote this article. To say that I was wrong is to say nothing at all. Today I would like to summarize and share a bit about the project, what we have managed to accomplish so far, and what is 'under the hood.' I will start with the mistakes from that article […]

Meet the Nemty ransomware from a fake PayPal website

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A new ransomware called Nemty has emerged online, which is believed to be a successor to GrandCrab or Buran. The malware primarily spreads via a fake PayPal website and has several interesting features. Details about the workings of this ransomware are below. The new Nemty ransomware was discovered by user nao_sec on September 7, 2019. The malware was distributed through a site disguised as PayPal, and it also has […]

Autonomous GSM relay with inverter made from ready components

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With this GSM relay, you can switch any load rated at 220V and a maximum power of 2 kW from anywhere on Earth where there is a cellular network. This device is controlled by an Arduino Nano through the SIM800L GSM module. The functional diagram with a list of components is provided below. It can operate both on built-in batteries and from the 220 […]

Launching the Otus.ru project

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Friends! The Otus.ru service is a tool for employment. We use educational methods to select the best specialists for business tasks. We have compiled and categorized job vacancies from major players in the IT business, creating courses based on the identified requirements. We have agreements with these companies that the best of our students will interview for relevant positions. We hope to connect […]

The oracles come to aid

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Blockchain oracles solve the problem of delivering information from the external world to the blockchain. However, it is important for us to know which ones we can trust. In our article about the launch of the Waves Oracles catalog, we discussed the significance of oracles for the blockchain. Decentralized applications do not have access to data outside of the blockchain. Therefore, small programsā€”oraclesā€”are created to access the necessary […]

Automatic restoration of the last saved configuration in Mikrotik routers

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Many have encountered the remarkable feature found, for example, in HPE switchesā€”if the configuration is not saved manually for some reason, the previous saved configuration is applied after a reboot. The technology can be merciless (forget to saveā€”start over), but it is fair and reliable. However, MikroTik devices lack such a feature in their base, although there is a long-known saying: 'remote router configuration […]

Your internet radio

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Many of us enjoy listening to the radio in the mornings. One beautiful morning, I realized that I no longer wanted to listen to local FM stations. They were uninteresting. But this habit proved to be detrimental. So, I decided to replace my FM receiver with an internet receiver. I quickly bought parts on AliExpress and assembled the internet receiver. About the internet receiver. The heart of the receiver is the ESP32 microcontroller. The firmware is from […]

The Inside Playbook. Network Features in the New Ansible Engine 2.9

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The upcoming release of Red Hat Ansible Engine 2.9 promises impressive improvements, some of which are outlined in this article. As usual, we developed improvements for Ansible Network openly, with community support. Join usā€”check out the task board on GitHub and explore the development plan for the Red Hat Ansible Engine 2.9 on the wiki page for […]

Nimble Storage in HPE: How InfoSight Enables Visibility into the Invisible in Your Infrastructure

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As you may have heard, in early March, Hewlett Packard Enterprise announced its intention to acquire independent hybrid and flash array manufacturer Nimble. On April 17, this purchase was completed, and now the company is fully owned by HPE. In countries where Nimble was previously introduced, Nimble products are already available through the Hewlett Packard Enterprise channel. In our country, this […]

Resource Planner in HPE InfoSight

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HPE InfoSight ā€“ a cloud service by HPE that allows for proactive identification of potential issues with the reliability and performance of HPE Nimble and HPE 3PAR arrays. The service can also immediately recommend ways to resolve potential problems, and in some cases, issues can be addressed proactively and automatically. We have previously discussed HPE InfoSight on HABR, see […]

Local files when transferring an application to Kubernetes

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When building a CI/CD process using Kubernetes, there can sometimes be a compatibility issue between the requirements of the new infrastructure and the application being migrated. Specifically, at the application build stage, it is essential to obtain a single image that will be used across all environments and clusters of the project. This principle is at the heart of what Google considers proper container management (this has been mentioned multiple times, and […]

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