August 2020

2020-08-26 | By Kamil Zabielski | In Security

How to secure SSH?

It is 2020, and we can say for sure, that ssh-server [1] is still one of the most popular services on Linux systems. During various meetings, I was often asked: How to secure SSH? Even though this question seems trivial, it is not. There are a lot of things to remember to accomplish well-designed service security. Secure shell is used not only for a remote-shell, per se. Many other technologies depend on it, for various reasons. I have decided to answer the above question once and forever, and maintain the freshness of this answer, so that you can always refer to this document, as an up-to…

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2020-08-24 | By Stanisław Szymański | In Container

Could you explain the basics of Docker?

Developers and non-operation teams often ask us to (as quickly as possible of course) teach them, how to handle certain tools, native to our workflows. We have decided to write a comprehensive article with frequently asked questions on Docker, as it is very often that they have to work on Docker with us, hand-to-hand. Our plan is to update this article as feedback comes, with even more answers. What is Docker? Docker [1] is a container runtime that uses Linux isolation layers such as namespaces, cgroups and capabilities. It may be compared to several other engines such as OpenVZ or LXC. What…

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2020-08-15 | By Stanisław Szymański | In Code

How to write quality code in Ansible?

More play, less book. Ask about DevOps way of automation, Ansible will pop up, sure thing. It has its bright sides, and ones that aren't as bright, but that's not what we're touching today - In this article, I will try to explain the principles of Ansible role building, that you can easily introduce in practice, to build elegant, elastic, easy to use and troubleshoot code. A real joy to maintain. I do also want this article to be understandable and simple - so that you won't need 10 years of experience, nor a Senior job title, to reap the benefits and become better at coding. When I started…

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