Nevan's blogs

arpl proxy

Sat, 22 Aug 2026 20:49:54 +0800

sed -i 's|https://github.com|https://gh-proxy.com/https://github.com|g' /opt/arpl/menu.sh

标签：arpl, 黑群晖, github

Dummy Interface

Sat, 22 Aug 2026 20:49:54 +0800

Dummy Interface 是 Linux 内核提供的一种虚拟网络接口， 不依赖物理硬件 ，仅存在于内核网络栈中。它的主要作用包括：

网络测试 ：在没有物理网卡的环境（如虚拟机、容器）中模拟网络环境。
服务绑定 ：将服务绑定到虚拟接口的 IP 地址，避免依赖物理网卡。
多 IP 模拟 ：在单台机器上模拟多网卡/多 IP 场景，测试负载均衡、高可用等配置。
流量转发 ：作为流量中转接口（需配合路由规则）。

Dummy Interface 的工作原理与物理接口类似，但不会发送或接收真实网络数据包，仅在系统内部处理网络流量。

2. 前置条件

在操作前，请确保满足以下条件：

Linux 系统 ：本文基于 Ubuntu 22.04 和 CentOS 8 测试，其他发行版（如 Debian、Fedora）操作类似。
root 权限 ：创建/配置网络接口需管理员权限（使用 sudo 或直接切换至 root）。
iproute2 工具 ：现代 Linux 系统默认预装，用于管理网络接口（替代老旧的 ifconfig ）。若未安装，可通过包管理器安装：
```
# Ubuntu/Debian
sudo apt install iproute2

# CentOS/RHEL
sudo yum install iproute2
```
内核模块 ：Dummy Interface 依赖内核模块 dummy ，通常默认加载。可通过以下命令检查：
```
lsmod | grep dummy
# 输出示例：dummy 16384 0
```
若未加载，手动加载： sudo modprobe dummy 。

ffmpeg user manual

Sat, 22 Aug 2026 20:49:54 +0800

转码:

ffmpeg -threads 2 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.mp4 -c:v h264_vaapi -b:v 4M -c:a copy -preset fast -crf 18 output.mp4

压缩分辨率:

ffmpeg -threads 2 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input_uhd.mp4 -vf 'deinterlace_vaapi=rate=field:auto=1,scale_vaapi=w=1920:h=1080' -c:v hevc_vaapi -b:v 8M -c:a copy -preset fast -crf 18 output_hd.mp4 -hide_banner

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.avi -filter:v scale=1920:-1 -c:a copy output.mkv -hide_banner

剪切:

ffmpeg -ss 00:00:20 -to 00:00:30 -i in.mp4 -c copy out.mp4

合并bilibili缓存音视频:

ffmpeg -i audio.m4s -i video.m4s -codec copy ../output.mp4

脚本 : ffmpeg-copy.sh :

geodata for v2rayng

Sat, 22 Aug 2026 20:49:54 +0800

https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geoip.dat

https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geosite.dat

标签：v2rayng, geodate

Hello World !

Sat, 22 Aug 2026 20:49:54 +0800

Hello World !

Install Waydroid

Sat, 22 Aug 2026 20:49:54 +0800

Requirements

xanmod kernel
kernel parameter:psi=1

firewall:

sudo ufw allow 67
sudo ufw allow 53
sudo ufw default allow FORWARD

Install

sudo apt install curl ca-certificates -y
proxychains4 curl https://repo.waydro.id | sudo bash
sudo apt install waydroid

Init

images url:https://sourceforge.net/projects/waydroid/files/images/

sudo waydroid init -f -i /usr/share/waydroid-extra/images
sudo chmod -R o+r /var/lib/waydroid
sudo chmod -R o+x /var/lib/waydroid

Start

sudo waydroid container start
waydroid session start

Launch

waydroid show-full-ui

ARM translation

url:https://github.com/casualsnek/waydroid_script

apt install python3-pip python3.11-venv lzip

git clone https://github.com/casualsnek/waydroid_script
cd waydroid_script
python3 -m venv venv
venv/bin/pip install -r requirements.txt
sudo venv/bin/python3 main.py

sudo proxychains4 venv/bin/python3 main.py install libhoudini

Reinit

waydroid session stop
sudo waydroid container stop
sudo rm -rf /var/lib/waydroid /home/.waydroid ~/waydroid ~/.share/waydroid ~/.local/share/applications/\*aydroid\* ~/.local/share/waydroid
sudo waydroid init -f -i /usr/share/waydroid-extra/images
waydroid show-full-ui

apps

waydroid app install com.app.apk
waydroid app launch com.app
PS：应用列表
waydroid app list

root shell

sudo waydroid shell

Etc.:

waydroid prop set persist.waydroid.width 0-9999 (int) # Used for user to override desired resolution,leave empty to reset.

Markdown Syntax Guide

Sat, 22 Aug 2026 20:49:54 +0800

This article offers a sample of basic Markdown syntax that can be used in Hugo content files, also it shows whether basic HTML elements are decorated with CSS in a Hugo theme.

Headings

The following HTML <h1>—<h6> elements represent six levels of section headings. <h1> is the highest section level while <h6> is the lowest.

H1

H2

H3

H4

H5

H6

Paragraph

Xerum, quo qui aut unt expliquam qui dolut labo. Aque venitatiusda cum, voluptionse latur sitiae dolessi aut parist aut dollo enim qui voluptate ma dolestendit peritin re plis aut quas inctum laceat est volestemque commosa as cus endigna tectur, offic to cor sequas etum rerum idem sintibus eiur? Quianimin porecus evelectur, cum que nis nust voloribus ratem aut omnimi, sitatur? Quiatem. Nam, omnis sum am facea corem alique molestrunt et eos evelece arcillit ut aut eos eos nus, sin conecerem erum fuga. Ri oditatquam, ad quibus unda veliamenimin cusam et facea ipsamus es exerum sitate dolores editium rerore eost, temped molorro ratiae volorro te reribus dolorer sperchicium faceata tiustia prat.

Math Typesetting

Sat, 22 Aug 2026 20:49:54 +0800

Mathematical notation in a Hugo project can be enabled by using third party JavaScript libraries.

In this example we will be using KaTeX

Create a partial under /layouts/partials/math.html
Within this partial reference the Auto-render Extension or host these scripts locally.
Include the partial in your templates like so:

{{ if or .Params.math .Site.Params.math }}
{{ partial "math.html" . }}
{{ end }}

To enable KaTex globally set the parameter math to true in a project’s configuration
To enable KaTex on a per page basis include the parameter math: true in content files

Note: Use the online reference of Supported TeX Functions

postgresql psql usage

Sat, 22 Aug 2026 20:49:54 +0800

docker exec -it postgres psql -h 127.0.0.1 -p 5432 -U nevan -d nevan
PGPASSWORD="admin" psql -h 127.0.0.1 -p 5432 -U nevan -d nevan

Create DB

sudo -u postgres psql

CREATE USER nevan WITH PASSWORD 'admin' CREATEDB;
CREATE DATABASE nevan TEMPLATE template0 ENCODING 'UTF8';
ALTER DATABASE nevan OWNER TO nevan;
GRANT ALL PRIVILEGES ON DATABASE nevan TO nevan;

Backup

pg_dump.sh

#!/bin/bash
#pg_dump -c -C --dbname=postgresql://nevan:nevan@127.0.0.1:5432/nevan > /root/DB/nevan_$(date +%F-%R).sql
#pg_dump -c -C --dbname=postgresql://nevan:nevan@127.0.0.1:5432/nevan > /root/DB/nevan.sql
#PGPASSWORD="admin" pg_dump -c -C -d nevan -h 127.0.0.1 -p 5432 -U nevan -F t -f /root/DB/nevan.tar

docker exec postgres pg_dump -c -C -d nevan -h 127.0.0.1 -p 5432 -U nevan -F t -f /backup/nevan.tar

pg_restore.sh

Tips of Nginx

Sat, 22 Aug 2026 20:49:54 +0800

No.1
使用nginx proxy代理https和http3访问时，HTTP/3 (QUIC) 请求被 Nginx 拒绝，返回 400 错误(missing required Host header)，而 HTTP/2 请求却能正常工作（返回 200），需要更改所有’proxy_set_header Host $http_host;‘为’proxy_set_header Host $host;’。
proxy_set_header Host $host; 相比 $http_host 更加健壮，因为它会优先使用客户端请求的 Host 头，如果为空则 fallback 到 $server_name。这在处理 HTTP/3 或某些特殊客户端请求时能有效避免 Host 头缺失的问题。

标签：Nginx, http3, quic

Nevan's blogs

arpl proxy

Dummy Interface

2. 前置条件

ffmpeg user manual

转码:

压缩分辨率:

剪切:

合并bilibili缓存音视频:

geodata for v2rayng

Hello World !

Install Waydroid

Requirements

firewall:

Install

Init

Start

Launch

ARM translation

Reinit

apps

root shell

Etc.:

Markdown Syntax Guide

Headings

H1

H2

H3

H4

H5

H6

Paragraph

Math Typesetting

postgresql psql usage

Login

Create DB

Backup

Tips of Nginx