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If you maintain Linux servers, you almost always have the ability to login with SSH, but not always have the luxury to login with a local console and keyboard. In this case, one misconfiguration on a server can cut off your ability to configure the server permanently. How to make a Linux server more resistant to your own mistakes? Let's find out.
Tailscale is a very simple and convenient VPN software. You can get a control plane, clients, routes and exit nodes with it in less than an hour without caring at all about how keys, routing or relays work. But what if you need to implement a network policy, for which Tailscale doesn't have an established interface? This article presents an example of how to implement PBR, knowing how Tailscale routing works.
Single-board computers are often used as Linux servers. Raspberry Pi 4, for example, has enough system resources to run multiple applications in parallel. Often, these applications are run separately on different VMs or containers, in order to enhance security and maintainability. This article shows a way to set up your Raspberry Pi as a Linux container host and a hypervisor.