SysAdmin

A step-by-step guide to relocating the Docker data directory to a new path. Covers daemon configuration, data migration, and cleanup for both older and newer Docker versions.

A practical guide to identifying which Docker containers occupy the largest overlay2 directories. Uses docker inspect, jq, and xargs to map cryptic layer hashes back to human-readable container names.

A byte-by-byte walkthrough of a TLS 1.3 handshake using OpenSSL’s s_client, comparing each message to its TLS 1.2 counterpart. Highlights how encryption, key exchange, and extensions differ in the latest revision.

Learn how to use Decryption Policy rules in Palo Alto Networks to define which traffic to decrypt and which to exclude. This guide also covers best practices for blocking QUIC and applying strict security profiles to sensitive traffic categories.

A step-by-step guide to creating and securing VLANs in the UniFi Network Console, including firewall rules to block inter-VLAN traffic and restrict console access.

A beginner-friendly overview of Virtual LANs, covering their benefits, typical usage scenarios, and the fundamentals of 802.1Q VLAN tagging.