Redis vs Memcached: Key Differences, Strengths, and When to Use Each

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Redis and Memcached are two widely used open-source, in-memory caching tools designed to store data in RAM for faster access than traditional disk-based databases. Memcached, developed by Danga Interactive for LiveJournal in 2003, is a multi-threaded, pure key-value store optimized for simplicity and high-speed transient data storage. Redis, by contrast, offers a richer feature set including support for complex data structures, persistence, and broader use cases beyond simple caching. Both tools help reduce database load, improve application scalability, and enhance user experience by serving frequently accessed data at low latency. Choosing between them depends on specific application requirements, with Memcached favoring raw simplicity and Redis offering greater versatility.

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FoxyInvoice Dev Blog: How Invoice Lifecycle, Tax Engine, and Exports Were Built

Developer blog series FoxyInvoice has published Chapter 5, detailing the domain logic behind its invoicing platform built for real production use. The invoice lifecycle follows a state machine moving from Draft through Sent to Paid, Partial, Overdue, or Void, with overdue status derived daily rather than stored. A dedicated tax engine handles US sales tax complexity by evaluating exemptions, nexus, jurisdiction rates, and product taxability per line item, using decimal arithmetic to avoid floating-point errors. All totals are computed server-side, with the browser's figures never trusted, and invoices lock after a configurable window to prevent retroactive edits. The platform also supports export formats including CSV, QuickBooks IIF, and Tally XML to meet accountant requirements across different markets.

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ProgrammingDEV Community ·

9,560 MikroTik Routers Expose SSH Globally Amid Two Actively Exploited Flaws

CERT Polska disclosed six MikroTik RouterOS vulnerabilities in September 2026, two of which — CVE-2026-67277 and CVE-2026-86060 — were already being actively exploited in combination to give unauthenticated attackers full administrative control. CISA added both flaws to its Known Exploited Vulnerabilities catalog on 10 September 2026. A ZoomEye scan identified over 8 million internet-visible RouterOS devices, of which 9,560 specifically expose SSH — the key precondition for the reported attack chain. Security researchers caution that these figures represent a floor, not a ceiling, since scanning coverage is incomplete and the fingerprint cannot distinguish patched from unpatched firmware. Organizations running RouterOS equipment are advised to audit internet-facing SSH exposure, verify firmware versions against patched releases, and review logs for signs of unauthorized access.

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ProgrammingDEV Community ·

Study: Claude Code hooks block protected file edits better than CLAUDE.md rules

Researchers ran 29 headless sessions using Claude Code v2.1.273 to compare two methods of preventing edits to a protected directory: a plain-language rule in CLAUDE.md and a PreToolUse shell hook. Both methods successfully blocked edits in normal conditions, but when users explicitly claimed authorization in the prompt, the CLAUDE.md rule was overridden in both test runs while the hook held firm in both. The CLAUDE.md approach added 58–70 input tokens to every request, whereas the hook incurred no token cost unless triggered, though it did introduce an extra model round trip on direct requests. Claude Code's own documentation notes that CLAUDE.md content is treated as context rather than enforced configuration, and that PreToolUse hooks are the correct mechanism for reliably blocking actions. The experiment provides concrete measurements backing that distinction, showing hooks are more tamper-resistant against user-supplied authorization claims.

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ProgrammingDEV Community ·

Key Docker Commands for Managing Containers, Images, and Volumes

This tutorial covers essential Docker commands used in day-to-day container management, including pulling images, running containers, and executing commands inside them. Lightweight base images such as Alpine and Bookworm are recommended for small applications to reduce overhead compared to full OS images. Commands like docker run -it, docker exec, and docker ps help users interact with and monitor running containers. Port mapping with the -p flag exposes container services to the host, while volume mounting with -v allows persistent or shared file storage. Additional commands such as docker logs, docker inspect, and the --rm flag for auto-removal round out core container lifecycle management.

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