// DevOps
Practical materials about infrastructure, networking, migrations, releases, and real problems solved in production.
58 DevOps materials published
Getting a new VPS is just the beginning. By default, the server is insecure and not ready for production use. This checklist will help you step by step to prepare your VPS: close security holes, enable updates, and …
Read moreThis article is compiled as a “cheat sheet” for SOHO/SMB networks: common issues, their symptoms, causes, quick fixes, and diagnostic checklists. Suitable for both engineers and admins who maintain the …
Read moreIntroduction WP-CLI is the official command-line tool for WordPress, allowing you to manage your sites without logging into the admin panel. With WP-CLI, you can install plugins, update WordPress core, manage users, …
Read moreIntroduction Netplan is a utility for declarative network configuration in Linux (Ubuntu, Debian, and derivatives). It is usually used for simple cases like Ethernet or Wi-Fi, but it can do much more: tunnel interfaces …
Read moreIntroduction Imagine: ping works, DNS responds, ports are open, mtr shows no loss, but curl returns errors like connection reset by peer or SSL handshake failed. There’s clearly a problem, but standard tools are …
Read moreIntroduction Up to this point, we’ve used simple utilities for specific tasks: ping checked connectivity, traceroute showed the path, ipconfig and arp helped with the local network, telnet and nc tested ports. That’s …
Read moreIntroduction A server’s IP address is like the postal address of an apartment building. But to reach the right apartment, you need the door number. In networking, these doors are ports. HTTP runs on port 80. HTTPS — on …
Read moreIntroduction You’ve gone through all the checks from the previous articles: The computer has the correct IP address (ipconfig). The router responds (ping 192.168.1.1). Ping to a public address (ping 8.8.8.8) works. Looks …
Read moreIntroduction In the previous article, we learned how to reach out to remote servers using ping and trace the path of packets with traceroute. But what if ping google.com doesn’t work, and traceroute stops right at the …
Read moreIn this guide, we’ll go through setting up an OpenVPN server on Ubuntu and connecting a Keenetic router to it. This setup is useful if you need to provide access to your home network or forward services (e.g., PBX or web …
Read more