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    Senior Network Engineer

    Marcin Ślęczek

    Network Engineer and System Administrator at networkers.pl Sp. z o.o. Since 1999, he deals with the administration of networks and GNU/Linux servers, and the integration of various solutions for IT systems and data centers. Since 2006, he has been working with Cisco Systems solutions, and since 2017 with Red Hat solutions. In 2009, he set up the company networkers.pl, which deals in the sale and implementation of solutions, hardware and software for IT systems and data centers.

Posts By Marcin Ślęczek (12)

  • Red Hat Ansible Automation – architecture and fe... 0

    Red Hat Ansible Automation is an open source automation platform. It is suitable for both low-level automation, which connects directly to each of the elements separately, and high-level, which is implemented through dedicated controllers from other manufacturers. In addition to the automation of other Red Hat Solutions, it also automat products and solutions from other

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  • Ansible, part IV – Variables and Jinja2 Template... 0

    Variables are used to store various types of data. Their values usually depend on the location or context in which they are located. Variables can be completely independent entities or grouped together with other variables, to describe or parameterize a given object. For this purpose, we can use the structure of a dictionary, which groups

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  • Service Orchestration – let’s warm-up! 0

    Orchestration simplifies the process of provisioning and providing services. It is highly conditioned by the automation of all tasks related to these processes. It applies to the network automation as well as automation of platforms and systems in which services will be launched and maintained. Below we’ve shown an example of architecture oriented to support

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  • Ansible, part III – YAML and Playbooks 0

    In the previous article, we showed how useful are ad-hoc commands. They allow us to run individual tasks on multiple nodes. Ad hoc commands are used on an ad hoc basis, hence their name. Their limitation is that they can only perform one module with one set of arguments at a time. It happens, that

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  • Ansible, part II – modules and ad-hoc commands 0

    Sending ad-hoc commands is very simple and at the same time opens up many very useful possibilities. Thanks to them, we can conveniently issue single command on one or many nodes. Issuing such commands allows among others: querying for various statuses, compliance verification, configuration backup, node or service restart, file, package and user accounts management,

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  • Ansible, part I – basics and inventory 2

    Making changes manually is tedious, and problematic in terms of documenting. Ansible addresses both of these problems. It’s great for what we don’t like. It is doing the same thing on many elements. In addition, the resulting YAML file becomes a form of documentation. It certainly will not replace the typical documentation with diagrams, tables

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  • Automation in practice 0

    When we hear about automation, we often see the image of robots and machines replacing people and taking their jobs. Let’s not go to extremes and let’s not be deceived by these myths. Let’s look at it from a different perspective. Automation in practice – let’s warm-up! To perform low-level, repetitive and monotonous activities, you

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  • RHEL 8 for data centers and cloud environments. Wh... 0

    In the next part of this article, we will go mostly through the better handling of software packages and more functional and safer support for containers and images. These elements are increasingly important in data centers and cloud environments. Before we get to it, let’s start with the most interesting feature for bare metal servers

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  • Web-based management interface, sessions recording... 0

    In the third part of this article, we will go through further improvements of the RHEL8 system, like: more efficient and secure graphic environment (GNOME and Wayland), recording of administrative sessions (terminal session recording), web-based management interface (Cockpit and its integration with Red Hat Satellite), simplified support for advanced disk system functions, better use of

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  • Safer DNS, e-mail and other improvements of RHEL 8 0

    In the first part of this article, we wrote about high-performance packet processing at the network adapter level using XDP and eBPF, and about the possibility of achieving greater throughput with lower latency, thanks to the BBR algorithm for TCP. These two new possibilities of the RHEL8 system bring benefits to everyone, regardless of the

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