BLE Random Address Type Bits
Published:
BLE random device addresses encode their address type in the two most significant bits of the random address.
Posts by Tags
address
agents
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
ai
A Professional Git Worktree Workflow with a Bare Repository
Published:
If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
algorithms
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
analysis
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.
android
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
appimage
Create a desktop entry for Cursor AppImage (with icon extraction)
Published:
Quick notes to make a Cursor AppImage launchable from your desktop menus and include a proper icon.
apple-silicon
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
appointment
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
architecture
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
automation
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
autonomous-driving
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
Published:
The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
bare-repo
A Professional Git Worktree Workflow with a Bare Repository
Published:
If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
bash
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
bioinformatics
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
ble
BLE Random Address Type Bits
Published:
BLE random device addresses encode their address type in the two most significant bits of the random address.
bluetooth
BLE Random Address Type Bits
Published:
BLE random device addresses encode their address type in the two most significant bits of the random address.
build
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
bundle-adjustment
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
calibration
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
china
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.
cloudflare
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
codex
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
command-line
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
computer-vision
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
Gold-Standard Error vs. Symmetric Transfer Error
Published:
Why gold-standard geometric error and symmetric transfer error differ, and when each is appropriate for evaluation and optimization.
Metric Rectification: Two Constraints from a Circle or Length Ratios
Published:
Why a circle becomes an ellipse after affine distortion, and how that ellipse (or two known length ratios) provides the two constraints needed for metric rectification.
Planar Homology: Applications and Intuition
Published:
Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
containerization
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
cursor
Create a desktop entry for Cursor AppImage (with icon extraction)
Published:
Quick notes to make a Cursor AppImage launchable from your desktop menus and include a proper icon.
debugging
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
desktop
Create a desktop entry for Cursor AppImage (with icon extraction)
Published:
Quick notes to make a Cursor AppImage launchable from your desktop menus and include a proper icon.
dns
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
docker
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
edge-based
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
education
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.
egl
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
embedded-systems
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
Published:
The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
engineering
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
environment
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
essential-matrix
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
estimation
Gold-Standard Error vs. Symmetric Transfer Error
Published:
Why gold-standard geometric error and symmetric transfer error differ, and when each is appropriate for evaluation and optimization.
extension
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
flutter
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
fundamental-matrix
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
geometric-error
Gold-Standard Error vs. Symmetric Transfer Error
Published:
Why gold-standard geometric error and symmetric transfer error differ, and when each is appropriate for evaluation and optimization.
geometry
Planar Homology: Applications and Intuition
Published:
Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
git
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
A Professional Git Worktree Workflow with a Bare Repository
Published:
If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
gitlab
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
gnome
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
gpu
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
gradle
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
graphhopper
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
graphs
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
hal
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
Published:
The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
hardware-abstraction
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
Published:
The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
homography
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
Gold-Standard Error vs. Symmetric Transfer Error
Published:
Why gold-standard geometric error and symmetric transfer error differ, and when each is appropriate for evaluation and optimization.
Metric Rectification: Two Constraints from a Circle or Length Ratios
Published:
Why a circle becomes an ellipse after affine distortion, and how that ellipse (or two known length ratios) provides the two constraints needed for metric rectification.
homology
Planar Homology: Applications and Intuition
Published:
Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
hybrid-graphics
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
input-method
macOS 下清理应用状态修复 WeType 简繁切换残留问题
Published:
macOS 下遇到一个 WeType 的奇怪问题：切换到繁体输入后，再切回简体输入，有些字仍然会按繁体输出，例如 還、總、覆 这类结果会残留在简体模式里。
java
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
jupyter
Setting Up Jupyter Terminal Keyboard Shortcut
Published:
Learn how to quickly create a new terminal in Jupyter using a custom keyboard shortcut. This is especially useful for developers who frequently need to run shell commands while working in Jupyter notebooks.
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
keyboard-shortcut
Setting Up Jupyter Terminal Keyboard Shortcut
Published:
Learn how to quickly create a new terminal in Jupyter using a custom keyboard shortcut. This is especially useful for developers who frequently need to run shell commands while working in Jupyter notebooks.
kotlin
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
kvm
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
lan
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
launchd
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
libvirt
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
linux
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
Create a desktop entry for Cursor AppImage (with icon extraction)
Published:
Quick notes to make a Cursor AppImage launchable from your desktop menus and include a proper icon.
linuxcnc
Why LinuxCNC Drivers Are HAL Components: Understanding a Domain-Specific Architecture
Published:
The HAL is not necessarily a module — it’s a boundary of responsibility between hardware-dependent and hardware-independent code.
macos
macOS 下清理应用状态修复 WeType 简繁切换残留问题
Published:
macOS 下遇到一个 WeType 的奇怪问题：切换到繁体输入后，再切回简体输入，有些字仍然会按繁体输出，例如 還、總、覆 这类结果会残留在简体模式里。
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
math
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.
mathematics
Planar Homology: Applications and Intuition
Published:
Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
navigation
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
nginx
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
nouveau
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
nvidia
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
opencv
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
opengl
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
openssh
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
Install OpenSSH Server on Windows from the Win32-OpenSSH release zip
Published:
Quick notes for setting up the Windows OpenSSH server from the OpenSSH-Win64.zip package.
openssl
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
orbslam3
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
pedagogy
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.
postgresql
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
powershell
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
Install OpenSSH Server on Windows from the Win32-OpenSSH release zip
Published:
Quick notes for setting up the Windows OpenSSH server from the OpenSSH-Win64.zip package.
productivity
Setting Up Jupyter Terminal Keyboard Shortcut
Published:
Learn how to quickly create a new terminal in Jupyter using a custom keyboard shortcut. This is especially useful for developers who frequently need to run shell commands while working in Jupyter notebooks.
projective-geometry
Metric Rectification: Two Constraints from a Circle or Length Ratios
Published:
Why a circle becomes an ellipse after affine distortion, and how that ellipse (or two known length ratios) provides the two constraints needed for metric rectification.
Planar Homology: Applications and Intuition
Published:
Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
pub-cache
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
python
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
qemu
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
r
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
rectification
Metric Rectification: Two Constraints from a Circle or Length Ratios
Published:
Why a circle becomes an ellipse after affine distortion, and how that ellipse (or two known length ratios) provides the two constraints needed for metric rectification.
robotics
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
Published:
The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
routing
GraphHopper paths are edges, not nodes
Published:
GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
scripts
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
security
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
seurat
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
Published:
A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
shortcut
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
software
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
ssh
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
Install OpenSSH Server on Windows from the Win32-OpenSSH release zip
Published:
Quick notes for setting up the Windows OpenSSH server from the OpenSSH-Win64.zip package.
terminal
Setting Up Jupyter Terminal Keyboard Shortcut
Published:
Learn how to quickly create a new terminal in Jupyter using a custom keyboard shortcut. This is especially useful for developers who frequently need to run shell commands while working in Jupyter notebooks.
troubleshooting
macOS 下清理应用状态修复 WeType 简繁切换残留问题
Published:
macOS 下遇到一个 WeType 的奇怪问题：切换到繁体输入后，再切回简体输入，有些字仍然会按繁体输出，例如 還、總、覆 这类结果会残留在简体模式里。
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
ubuntu
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
vfs
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
virtualization
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
visa
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
vm-management
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
Published:
A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
vscode
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
wayland
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
weixin
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
wetype
macOS 下清理应用状态修复 WeType 简繁切换残留问题
Published:
macOS 下遇到一个 WeType 的奇怪问题：切换到繁体输入后，再切回简体输入，有些字仍然会按繁体输出，例如 還、總、覆 这类结果会残留在简体模式里。
windows
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
Install OpenSSH Server on Windows from the Win32-OpenSSH release zip
Published:
Quick notes for setting up the Windows OpenSSH server from the OpenSSH-Win64.zip package.
wireguard
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
workflow
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
A Professional Git Worktree Workflow with a Bare Repository
Published:
If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
worktree
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
A Professional Git Worktree Workflow with a Bare Repository
Published:
If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
xdotool
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
xwayland
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.