https://www.pohvii.cloud Latest blog posts from Léon Zhang. en-US Fri, 08 May 2026 00:00:00 GMT https://www.pohvii.cloud/en/blog/file-upload-architecture-control-in-the-app-bytes-in-object-storage-97edd890 https://www.pohvii.cloud/en/blog/file-upload-architecture-control-in-the-app-bytes-in-object-storage-97edd890 Fri, 08 May 2026 00:00:00 GMT A production file upload architecture that keeps authorization, policy, and metadata in the application while sending large file bytes directly to object storage. File UploadsObject StorageSecurityArchitectureWeb DevelopmentKubernetes https://www.pohvii.cloud/en/blog/fail2ban-on-k3s-watching-pod-logs-and-blocking-before-nat-2b6f2b46 https://www.pohvii.cloud/en/blog/fail2ban-on-k3s-watching-pod-logs-and-blocking-before-nat-2b6f2b46 Wed, 06 May 2026 00:00:00 GMT A practical guide to using Fail2Ban with Kubernetes or k3s logs, preserving client IPs through Traefik, and blocking pod traffic in the raw table PREROUTING chain before Kubernetes service NAT rewrites the packet path. Fail2BanKubernetesk3sTraefikiptablesSecurityDevOps https://www.pohvii.cloud/en/blog/do-not-run-a-database-in-a-container-unless-you-pin-it-e2f09335 https://www.pohvii.cloud/en/blog/do-not-run-a-database-in-a-container-unless-you-pin-it-e2f09335 Thu, 02 Apr 2026 00:00:00 GMT Running MySQL or PostgreSQL in Docker is fine. The real risk is blindly updating mutable image tags instead of pinning versions, testing upgrades, and planning rollback. DockerMySQLPostgreSQLDatabasesContainersDevOps https://www.pohvii.cloud/en/blog/installing-windows-on-proxmox-ve-pve-9a943890 https://www.pohvii.cloud/en/blog/installing-windows-on-proxmox-ve-pve-9a943890 Mon, 30 Mar 2026 00:00:00 GMT Step-by-step guide for installing Windows 11 on Proxmox with VirtIO drivers, recommended VM settings, and troubleshooting. ProxmoxWindowsVirtIOVirtualization https://www.pohvii.cloud/en/blog/fix-brew-upgrade-codex-when-homebrew-says-the-latest-version-is-already-installed-1a6031a8 https://www.pohvii.cloud/en/blog/fix-brew-upgrade-codex-when-homebrew-says-the-latest-version-is-already-installed-1a6031a8 Fri, 27 Mar 2026 00:00:00 GMT If Homebrew says Codex is already up to date even though the upstream cask is newer, the usual cause is a stale Homebrew API cache or a lagging mirror. Here is the exact fix and why it works. HomebrewCodexmacOSPackage ManagementCachingCLI https://www.pohvii.cloud/en/blog/how-to-implement-lenis-in-nextjs-app-router-1750f15b https://www.pohvii.cloud/en/blog/how-to-implement-lenis-in-nextjs-app-router-1750f15b Fri, 27 Mar 2026 00:00:00 GMT A practical guide to setting up Lenis in a fresh Next.js App Router project with TypeScript, including provider wiring, anchor links, sticky-header-safe section navigation, and programmatic scrolling with lenis/react. Next.jsLenisReactTypeScriptApp RouterSmooth Scrolling https://www.pohvii.cloud/en/blog/how-to-merge-github-actions-pull-requests-automatically-e38e563a https://www.pohvii.cloud/en/blog/how-to-merge-github-actions-pull-requests-automatically-e38e563a Wed, 11 Mar 2026 00:00:00 GMT A concise setup guide for GitHub Actions workflows that open pull requests and merge them automatically, including when to use GitHub auto-merge and when to merge the pull request immediately. GitHub ActionsPull RequestsAuto MergeAutomationCI/CDGitHub https://www.pohvii.cloud/en/blog/kubernetes-configmap-refresh-under-fluxcd-what-actually-updates-bdbadd86 https://www.pohvii.cloud/en/blog/kubernetes-configmap-refresh-under-fluxcd-what-actually-updates-bdbadd86 Tue, 10 Mar 2026 00:00:00 GMT A practical guide to how ConfigMap updates behave under FluxCD, including the difference between mounted files and environment variables, why some changes do not restart pods, and the rollout patterns that work best in GitOps. KubernetesFluxCDConfigMapGitOpsDevOpsNginx https://www.pohvii.cloud/en/blog/add-some-fun-while-vibe-coding-because-codex-is-too-slow-40318781 https://www.pohvii.cloud/en/blog/add-some-fun-while-vibe-coding-because-codex-is-too-slow-40318781 Fri, 27 Feb 2026 00:00:00 GMT Waiting for code generation can feel slow. Here is a quick way to make vibe coding more fun with PeonPing, plus a Dota 2 Axe voice pack setup. Vibe CodingDeveloper ToolsCLIProductivityGaming https://www.pohvii.cloud/en/blog/batch-add-email-addresses-to-outlook-contacts-1eb6dce1 https://www.pohvii.cloud/en/blog/batch-add-email-addresses-to-outlook-contacts-1eb6dce1 Thu, 27 Nov 2025 00:00:00 GMT A practical guide to efficiently adding hundreds of email addresses to your Outlook distribution list using Excel extraction and browser automation. OutlookAutomationPythonProductivityEmail Management https://www.pohvii.cloud/en/blog/the-complete-guide-to-faviconico-technical-implementation-seo-impact-and-automation-4a1b0ce5 https://www.pohvii.cloud/en/blog/the-complete-guide-to-faviconico-technical-implementation-seo-impact-and-automation-4a1b0ce5 Mon, 24 Nov 2025 00:00:00 GMT Master favicon implementation with this comprehensive guide covering technical specs, SEO benefits, automation scripts, and modern web development best practices. SEOHTMLWeb DevelopmentPerformancePWAAutomation https://www.pohvii.cloud/en/blog/routing-home-lan-traffic-through-wireguard-vpn-7ac4f457 https://www.pohvii.cloud/en/blog/routing-home-lan-traffic-through-wireguard-vpn-7ac4f457 Fri, 31 Oct 2025 00:00:00 GMT Learn how to configure your WireGuard VPN to access devices on your home LAN network from remote locations. A complete guide covering macOS gateway setup, NAT configuration, and client routing. WireGuardVPNNetworkingmacOSNATRoutingHome Lab https://www.pohvii.cloud/en/blog/designing-a-view-transition-theme-toggle-animation-in-nextjs-86fccc05 https://www.pohvii.cloud/en/blog/designing-a-view-transition-theme-toggle-animation-in-nextjs-86fccc05 Wed, 15 Oct 2025 00:00:00 GMT How we built a theme toggle that expands into light mode and contracts back to dark mode using the View Transitions API, next-themes, and a pinch of Web Animations control. Next.jsReactAnimationsView TransitionsDark ModeUI https://www.pohvii.cloud/en/blog/how-to-ship-hls-streaming-in-nextjs-with-plyr-and-ffmpeg-d3852b51 https://www.pohvii.cloud/en/blog/how-to-ship-hls-streaming-in-nextjs-with-plyr-and-ffmpeg-d3852b51 Sat, 11 Oct 2025 00:00:00 GMT A practical walkthrough on packaging adaptive bitrate video with ffmpeg, wiring HLS into a Next.js app using Plyr, and embedding streams inside MDX blog posts. HLSVideo StreamingNext.jsffmpegPlyrAdaptive Bitrate https://www.pohvii.cloud/en/blog/why-i-switched-from-nextjs-image-to-imgproxy-and-you-should-too-4730f065 https://www.pohvii.cloud/en/blog/why-i-switched-from-nextjs-image-to-imgproxy-and-you-should-too-4730f065 Wed, 24 Sep 2025 00:00:00 GMT Learn how switching from Next.js built-in image optimization to Imgproxy solved critical OOM errors and improved performance. Includes complete implementation guide with CORS configuration and security best practices. Next.jsImage OptimizationPerformanceImgproxyMemory ManagementCORSWeb Development https://www.pohvii.cloud/en/blog/essential-algorithms-and-data-structures-a-comprehensive-programming-guide-2f8a9d1c https://www.pohvii.cloud/en/blog/essential-algorithms-and-data-structures-a-comprehensive-programming-guide-2f8a9d1c Mon, 22 Sep 2025 00:00:00 GMT Master fundamental algorithms and data structures with practical Java implementations. From binary search to graph algorithms, learn the patterns that power efficient code. AlgorithmsData StructuresJavaProgrammingSoftware EngineeringComputer Science https://www.pohvii.cloud/en/blog/how-to-clear-all-blocked-contacts-in-ios-the-macos-mail-app-solution-7a3c2e1f https://www.pohvii.cloud/en/blog/how-to-clear-all-blocked-contacts-in-ios-the-macos-mail-app-solution-7a3c2e1f Mon, 22 Sep 2025 00:00:00 GMT Frustrated with deleting blocked contacts one by one in iOS? Learn how to use the macOS Mail app to bulk delete hundreds of blocked numbers and emails that sync back to your iPhone. iOSmacOSiPhone TipsContact ManagementProductivity https://www.pohvii.cloud/en/blog/mastering-sharepoint-development-with-microsoft-graph-api-sitesselected-permissions-and-advanced-operations-68ca401e https://www.pohvii.cloud/en/blog/mastering-sharepoint-development-with-microsoft-graph-api-sitesselected-permissions-and-advanced-operations-68ca401e Mon, 22 Sep 2025 00:00:00 GMT A comprehensive guide to SharePoint development using Microsoft Graph API, covering Sites.Selected permissions, site and list operations, and handling complex field types SharePointMicrosoft GraphAPIAzure ADDevelopmentSecurity https://www.pohvii.cloud/en/blog/why-self-healing-urls-are-essential-for-modern-websites-8f4e9d12 https://www.pohvii.cloud/en/blog/why-self-healing-urls-are-essential-for-modern-websites-8f4e9d12 Thu, 18 Sep 2025 00:00:00 GMT Discover how self-healing URLs can transform your website's SEO, user experience, and maintenance overhead. Learn why major platforms like Amazon and Medium use this powerful technique. SEOURL StructureUser ExperienceWeb DevelopmentContent Strategy https://www.pohvii.cloud/en/blog/zero-knowledge-password-proofs-how-opaque-is-revolutionizing-authentication-security-7ce96e45 https://www.pohvii.cloud/en/blog/zero-knowledge-password-proofs-how-opaque-is-revolutionizing-authentication-security-7ce96e45 Wed, 17 Sep 2025 00:00:00 GMT Discover how zero-knowledge password proofs and the OPAQUE protocol are transforming authentication security, eliminating password breaches and protecting user credentials even from servers themselves. CryptographySecurityAuthenticationZero KnowledgeOPAQUEPrivacy https://www.pohvii.cloud/en/blog/how-to-write-a-tech-blog-a-comprehensive-guide-0c74e0ba https://www.pohvii.cloud/en/blog/how-to-write-a-tech-blog-a-comprehensive-guide-0c74e0ba Mon, 15 Sep 2025 00:00:00 GMT Master the art of technical writing with this complete guide covering topic selection, structure, SEO optimization, and best practices for creating engaging tech content. Tech BloggingTechnical WritingContent CreationSEO https://www.pohvii.cloud/en/blog/git-lfs-large-file-storage-f83967b1 https://www.pohvii.cloud/en/blog/git-lfs-large-file-storage-f83967b1 Sat, 06 Sep 2025 00:00:00 GMT Practical guide to installing, configuring, and using Git LFS for managing large binary assets efficiently, with tips for tracking, workflow, partial clones, and troubleshooting. GitGit LFSDevOpsLarge Files https://www.pohvii.cloud/en/blog/spring-boot-spi-and-autoconfigurationimports-technical-guide-fe8adea7 https://www.pohvii.cloud/en/blog/spring-boot-spi-and-autoconfigurationimports-technical-guide-fe8adea7 Sat, 06 Sep 2025 00:00:00 GMT Deep dive into Spring Boot's SPI mechanism and the modern AutoConfiguration.imports pipeline, including file formats, processing flow, metadata optimization, migration steps, and real-world examples. Spring BootSPIAutoConfigurationJava https://www.pohvii.cloud/en/blog/vmware-fusion-networking-configuration-ef79b0dd https://www.pohvii.cloud/en/blog/vmware-fusion-networking-configuration-ef79b0dd Sat, 06 Sep 2025 00:00:00 GMT Practical notes on configuring VMware Fusion virtual networks, DHCP/NAT settings, and useful commands on macOS. VMwaremacOSNetworkingVirtualization https://www.pohvii.cloud/zh/blog/java-class-lifecycle-a3f7abef https://www.pohvii.cloud/zh/blog/java-class-lifecycle-a3f7abef Sat, 06 Sep 2025 00:00:00 GMT Notes on the Java class loading process including loading, verification, preparation, resolution, initialization, usage, and unloading. JavaJVMClassLoaderLifecycle https://www.pohvii.cloud/zh/blog/java-thread-lifecycle-21a8ca84 https://www.pohvii.cloud/zh/blog/java-thread-lifecycle-21a8ca84 Sat, 06 Sep 2025 00:00:00 GMT A concise overview of Java thread states with transitions and practical notes. JavaConcurrencyThreadsJVM https://www.pohvii.cloud/zh/blog/java-thread-pool-essentials-6cc9397a https://www.pohvii.cloud/zh/blog/java-thread-pool-essentials-6cc9397a Sat, 06 Sep 2025 00:00:00 GMT Key parameters and behaviors of Java thread pools, including sizing strategy, queues, factories, and rejection policies. JavaConcurrencyThreadPoolExecutors https://www.pohvii.cloud/zh/blog/jvm-notes-generations-and-tuning-0ef20c39 https://www.pohvii.cloud/zh/blog/jvm-notes-generations-and-tuning-0ef20c39 Sat, 06 Sep 2025 00:00:00 GMT Quick notes on JVM memory generations, GC survivor spaces, metaspace, and common tuning flags. JVMGCPerformanceJava https://www.pohvii.cloud/zh/blog/spring-bean-lifecycle-54c2adfc https://www.pohvii.cloud/zh/blog/spring-bean-lifecycle-54c2adfc Sat, 06 Sep 2025 00:00:00 GMT Concise notes on the full Spring Bean lifecycle including instantiation, dependency injection, initialization hooks, BeanPostProcessor phases, usage, and destruction. SpringJavaLifecycleBeans https://www.pohvii.cloud/en/blog/testing-comment-system-795aade4 https://www.pohvii.cloud/en/blog/testing-comment-system-795aade4 Fri, 24 Jan 2025 00:00:00 GMT A simple test blog post to verify that the Giscus comment system works correctly with our self-healing URL implementation. TestingCommentsBlog