Build, Deploy, and Troubleshoot Modern Systems
Command-driven tutorials for Linux, containers, Kubernetes, backend development, web standards, security, and production operations.
Browse latest tutorials$ kubectl get pods -A
$ docker compose up -d
$ php -v
$ node --version
$ python --versionExplore tutorial series
Docker
Practical Docker tutorials covering installation, container lifecycle, images, Dockerfiles, storage, networking, security, troubleshooting, and production operations.
Kubernetes
Practical Kubernetes tutorials covering cluster installation, workloads, networking, storage, scaling, security, and operations.
- Fix “context deadline exceeded” in Kubernetes: Complete Troubleshooting Guide
- Calico Failed to Create Pod Sandbox: Kubernetes API 10.96.0.1:443 Timeout
- Kubernetes Troubleshooting: CrashLoopBackOff, Pending Pods, DNS, and ImagePullBackOff
- How to Deploy PostgreSQL with a StatefulSet and Persistent Storage
Node.js
Hands-on Node.js tutorials for backend development, testing, security, containers, Linux, and Kubernetes.
Python
Practical Python tutorials for development, automation, testing and deployment.
HTML
Original HTML tutorials covering documents, forms, graphics, media, browser APIs, accessibility, examples, and references.
PHP
Practical PHP 8.3 tutorials for language fundamentals, web development, security, databases, testing, and deployment.
Products from LAPVN
Selected products currently available for enquiries.
Remote Pig Health Support & Herd Monitoring
Structured remote support for pig health observations, herd trends, video walkthroughs, monitoring records, triage, biosecurity, and coordination with licensed local veterinarians.
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Pig Farm Design & Planning Consulting
Professional pig farm concept design covering site layout, production flow, ventilation, water, feed, drainage, waste management, biosecurity, welfare, and expansion planning.
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DevOps Infrastructure Consulting & System Design
Architecture consulting for Kubernetes, Docker, MariaDB, MongoDB, ELK, CI/CD, observability, security, backups, migrations, and production operations.
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Lai Thieu A26 Grower Pig Feed – 20 to 40 kg
Complete powder or pellet feed for grower pigs in the approximate 20–40 kg stage. Contact LAPVN for current packaging, stock, pricing, and delivery.
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Lai Thieu Premium A20 Piglet Feed – 8 to 20 kg
Complete powder or pellet feed for young pigs in the approximate 8–20 kg stage. Contact LAPVN for current packaging, stock, pricing, and delivery.
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Lai Thieu Premium A10 Piglet Creep Feed
Complete powder or pellet creep feed for suckling piglets from approximately 5 days of age to about 8 kg. Contact LAPVN for current stock,…
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Fresh Young Coconuts for Drinking Water
Fresh young coconuts selected for naturally refreshing drinking water and tender flesh. Contact us for current harvest availability, quantities, pricing, collection, and delivery options.
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Pure Coconut Caramel Coloring Sauce
Pure coconut caramel coloring sauce with a rich amber color for Vietnamese braises, marinades, clay-pot dishes, and savory sauces.
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Young Wild Boar Piglets – 3.5 to 5 kg
Healthy young wild boar piglets in the 3.5–5 kg range. Contact us for availability, current pricing, quantity, and eligible delivery options.
View product →Latest tutorials
Regex Testing and Debugging: A Repeatable Workflow
Build reliable regex tests with positive, negative, boundary, Unicode, replacement, and performance cases using a repeatable debugging process.
Read tutorial →Regex Performance and ReDoS: A Practical Defense
Prevent regex performance failures and ReDoS by recognizing ambiguous backtracking, testing hostile inputs, and applying production safeguards.
Read tutorial →Python Regex Guide: `re` Patterns That Stay Clear
Learn Python regex with raw strings, search, fullmatch, finditer, sub, named groups, flags, tests, Unicode behavior, and common mistakes.
Read tutorial →JavaScript Regex Guide: Patterns, Flags, and APIs
Use JavaScript regex confidently with literals, constructors, flags, matchAll, replace callbacks, Unicode modes, tests, and debugging tips.
Read tutorial →Greedy vs Lazy Regex: Stop Matching Too Much
Learn why regex matches too much, how greedy and lazy quantifiers behave, and how explicit delimiters produce safer, faster patterns.
Read tutorial →Regex Lookahead and Lookbehind: Clear Examples
Understand regex lookahead and lookbehind with practical extraction and validation examples, engine differences, pitfalls, and testing advice.
Read tutorial →Regex Groups and Backreferences: Practical Guide
Learn capturing, noncapturing, and named regex groups, plus safe backreference patterns for extraction, validation, and replacement.
Read tutorial →Regex Cheat Sheet: Syntax, Examples, and Pitfalls
Keep this practical regex cheat sheet nearby for character classes, anchors, groups, lookarounds, flags, replacements, and tested examples.
Read tutorial →8 Best Online Regex Testers for Every Regex Flavor
Compare the best online regex testers by engine support, debugging, sharing, privacy, and workflow to choose the right tool for your pattern.
Read tutorial →Regex Tutorial for Beginners: A Practical Guide
Learn regex from first principles with practical examples, common mistakes, testing steps, and patterns you can adapt safely in real projects.
Read tutorial →Diagnose MariaDB Table Corruption Without More Damage
Diagnose MariaDB table corruption safely. Identify the engine and failure layer, preserve evidence, choose repair or restore, and verify every recovered table.
Read tutorial →Troubleshoot MariaDB Disk Full and Inode Exhaustion
Recover safely from MariaDB disk full and inode exhaustion. Find the affected path, preserve replication and backups, free space, and prevent recurrence.
Read tutorial →Safely Recover MariaDB When the Service Will Not Start
Diagnose a MariaDB service that will not start. Preserve evidence, validate configuration, check storage and permissions, recover safely, and verify data.
Read tutorial →Fix MariaDB Access Denied Errors Without Broad Grants
Diagnose MariaDB access denied. Verify server, transport, account host matching, authentication plugins, TLS, passwords, and grants without opening access.
Read tutorial →Fix MariaDB Too Many Connections Errors Safely in Production
Resolve MariaDB too many connections safely. Preserve admin access, identify pool spikes, stop retries, budget capacity, apply limits, and verify recovery.
Read tutorial →Troubleshoot MariaDB High Memory Usage and OOM Kills
Diagnose MariaDB high memory and OOM kills safely. Read kernel and cgroup evidence, find global and session allocations, mitigate pressure, and budget…
Read tutorial →Troubleshoot MariaDB High CPU Usage Step by Step Safely
Diagnose MariaDB high CPU safely. Separate host pressure from query load, rank SQL digests, inspect plans and threads, mitigate overload, and verify…
Read tutorial →Find and Fix MariaDB Lock Waits and Deadlocks Safely
Diagnose MariaDB lock waits, deadlocks, and metadata locks. Build blocking chains, capture evidence, stop the right session, fix transactions, and retry safely.
Read tutorial →Design Effective MariaDB Indexes Without Over-Indexing
Design MariaDB indexes from real queries, choose composite column order, avoid redundant keys, measure write costs, test ignored indexes, and roll out…
Read tutorial →Analyze MariaDB Queries with EXPLAIN and ANALYZE Safely
Read MariaDB EXPLAIN and ANALYZE plans safely. Compare estimates with runtime rows, diagnose joins and sorts, handle skew, test indexes, and verify…
Read tutorial →Use the MariaDB Slow Query Log for Better Diagnosis
Configure the MariaDB slow query log safely, capture useful evidence, control volume, analyze query patterns, protect sensitive SQL, and verify fixes.
Read tutorial →Optimize MariaDB Redo Logs and Transaction Durability
Size MariaDB redo logs safely, choose transaction durability settings, diagnose checkpoint pressure, resize by version, test recovery, and plan rollback.
Read tutorial →Tune MariaDB Temporary Tables and Sort Operations Safely
Tune MariaDB temporary tables and sorts with measured spill rates, safe memory limits, query and index fixes, tmpdir capacity, monitoring, and rollback.
Read tutorial →Configure MariaDB Time Zones Without Timestamp Bugs
Configure MariaDB time zones safely. Compare TIMESTAMP and DATETIME, load named zones, test DST boundaries, migrate legacy data, monitor drift, and roll…
Read tutorial →Commands you can run. Results you can verify.
Implementation, checks, troubleshooting, and rollback considerations in every guide.