[EN] Unix, BSD and Linux – SinusPL's Blog

Docker and arno-iptables-firewall

How to Use Arno’s IPTABLES Firewall with Docker

When using Arno’s iptables firewall alongside Docker, it’s common to run into networking issues. After restarting the firewall, Docker containers might lose external connectivity or port forwarding stops working. This happens because Arno’s firewall wiped the iptables rules that Docker had automatically inserted.

Basic Linux shell commands

Shell commands provide essential tools for managing files, monitoring system performance, and automating tasks. They enable users to navigate directories, organize data, and handle system resources efficiently. Advanced techniques allow for text processing, data extraction, and modifying system settings with precision. Users can also automate repetitive tasks, schedule operations, and manage system permissions effectively. With the right commands, system maintenance, troubleshooting, and performance optimization become seamless, making the command line a powerful tool for both beginners and advanced users.

All relevant MegaCLI options

MegaCLI (MegaRAID Command Line Interface) is a command-line utility used to manage and configure LSI (now Broadcom) MegaRAID controllers in servers and storage systems. It provides powerful options for monitoring, troubleshooting, and maintaining RAID configurations, including creating and deleting virtual drives, checking disk health, rebuilding arrays, and retrieving detailed status reports.

Mastodon server management

Mastodon is an open source, self-hosted, social networking service. Mastodon uses the ActivityPub protocol for federation which allows users to communicate between independent Mastodon instances and other ActivityPub compatible services. Mastodon has microblogging features similar to Twitter, and is generally considered to be a part of the Fediverse. – info from Wikipedia

Crontab options explained

If you ever wondered what the numbers in crontabs are, here’s an explanation.