gaoyifan

#! /usr/sbin/nft -f

chain tc-wan {
	# check default priority
	mark & 0xff0 == 0x130 ip dscp set af22 return

	# real-time application
	## Dota2
	udp dport 27000-27200 \
	meta mark set mark & 0xfffff00f ^ 0x110 ip dscp set af41 return

gaoyifan

import cv2
import pyqrcode
import numpy as np
import io

# Set the width, height and frame rate of the video
width, height, fps = 512, 512, 10

# Create a video writer object, using FFmpeg

gaoyifan

server {
	listen 80;
	listen 443;
	listen [::]:80;
	listen [::]:443;
	
	server_name fonts.lug.ustc.edu.cn;
	access_log	/var/log/nginx/revproxy_access.log;
	error_log	/var/log/nginx/revproxy_error.log;
	

gaoyifan

ubuntu 添加新硬盘

查看硬盘：

# fdisk -l
...
Disk /dev/sdb: 274.9 GB, 274877906944 bytes
255 heads, 63 sectors/track, 33418 cylinders, total 	536870912 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

gaoyifan

#!/usr/bin/env bash

# require: git version > 2.3
# require: `db/letsencrypt` existed in git repo

if [[ -z "$CERTBOT_DOMAIN" ]] || [[ -z "$CERTBOT_VALIDATION" ]]; then
    echo '$CERTBOT_DOMAIN and $CERTBOT_VALIDATION environment variables required.'
fi

source /etc/letsencrypt/dns-auth.conf

gaoyifan

#!/usr/bin/env bash
set -xe

apt install -y build-essential git gcc-arm-none-eabi bison flex device-tree-compiler bc debootstrap

BASE=${BASE:-$(mktemp -d)}

cd $BASE
pwd
git clone https://github.com/ARM-software/arm-trusted-firmware.git

gaoyifan

User Mode Linux on Debian Jessie

host kernel version: 3.16.36-1+deb8u2

target kernel version: 4.9-rc5

Build UML kernel

Preparation

gaoyifan

RTAI installation for ubuntu 14.04

Preparation

download and unzip

cd /usr/src
curl -L https://www.rtai.org/userfiles/downloads/RTAI/rtai-4.1.tar.bz2 | tar xj
curl -L https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.10.32.tar.xz | tar xJ
curl -L http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10.32-saucy/linux-image-3.10.32-031032-generic_3.10.32-031032.201402221635_amd64.deb -o linux-image-3.10.32-generic-amd64.deb

gaoyifan

#!/bin/sh

# example: ./ramdom-ipv6.sh 2402:f000:1::/48 166.111.21.1

table_id=436298364
ipv6_cidr=$1
ipv4_addr=$2

ipv6_prefix=$(echo $ipv6_cidr | cut -d / -f 1)
ipv6_sublen=$(echo $ipv6_cidr | cut -d / -f 2)

gaoyifan

alicdnkk.miaopai.com                         2    1.2    1.2
s3-static.lufaxcdn.com                       2    1.2    2.4
ali-ind-cdn.kwai.net                         2    1.2    3.6
c3.xinstatic.com                             2    1.2    4.8
cdn.scdng.com                                2    1.2    6.1
jzsite.cdnpe.com                             2    1.2    7.3
qncdnbb.miaopai.com                          2    1.2    8.5
aliyuncdn-monitortestp-res.mzres.com         2    1.2    9.7
ottvideogs.hifuntv.com                       2    1.2   10.9
wylivetest.cdnpe.com                         2    1.2   12.1