Donny Jie kj54321

Install Nvidia Driver on Ubuntu 18.04.3

Secure Boot

This section applies to machines with Secure Boot, such as ThinkPad.

Before installation, switch to "Discrete Graphics" in BIOS, if both Intel and Nvidia graphics are present.
During installation, make sure to select the "Install third-party software for graphics and Wi-Fi hardware and addition media formats" in "Updates and other software" screen.
Select "Configure Secure Boot", and set password.
Continue Ubuntu installation as normal.

Why?

Useful for:

updating current terminal's shell env proxy settings, or
wrapping exec in .desktop files to inject env proxy settings

GNOME proxy settings should normally get propergated into the shell (bash) environment via gnome-terminal, e.g. http_proxy and no_proxy. However:

I noticed that applications exectuted via .desktop entries sometimes don't work. This happens when an app ignores org.gnome.proxy settings but can often use proxy env vars from the shell.
If you're proxy settings change, existing shell processes will still have the old proxy enviroment variables, so this can help refresh them whithout having to create a new shell.

Install Shadowsocks-libev + simple-obfs on Ubuntu 16.04

Install shadowsocks-libev via Ubuntu PPA

sudo apt-get install software-properties-common -y
sudo add-apt-repository ppa:max-c-lv/shadowsocks-libev -y
sudo apt-get update
sudo apt install shadowsocks-libev

Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For an emulator that mimics a Pixel 5 Device with Google APIs and ARM architecture (for an M1/M2 Macbook):

List All System Images Available for Download: sdkmanager --list | grep system-images
Download Image: sdkmanager --install "system-images;android-30;google_atd;arm64-v8a"

set http or socks proxy environment variables

# set http proxy
export http_proxy=http://PROXYHOST:PROXYPORT

# set http proxy with user and password
export http_proxy=http://USERNAME:PASSWORD@PROXYHOST:PROXYPORT

# set http proxy with user and password (with special characters)

Attempt to manage vpn routing table with `/etc/ppp/ip-up`

Related Stackoverflow Question:
https://superuser.com/a/206826/55267

Related answer:
https://superuser.com/a/206826/55267

# setup

	#!/usr/bin/python3

	# script created for reading SMS messages from 3G modem connected to PC
	# 1) it looks for modem
	# 2) reads all SMS messages from modem
	# 3) prints all found SMS messages to stdout only if total messages count
	# greater than SMS_STORE_COUNT (default is 3)
	# 4) save all but SMS_STORE_COUNT messages to txt files and
	# delete them from modem

	[Unit]
	Description=speeder service
	After=syslog.target network.target auditd.service
	[Service]
	Type=notify
	NotifyAccess=all
	User=root
	ExecStart=/usr/local/bin/speederv2_amd64 -c -l0.0.0.0:34000 -r47.74.239.218:34002 -f2:18 --timeout 0
	ExecReload=/bin/kill -HUP
	ExecStop=/bin/kill -s QUIT PrivateTmp=true

	# Haproxy的常见配置
	# 参考文档：
	# http://cbonte.github.io/haproxy-dconv/1.9/configuration.html
	# http://blog.sina.com.cn/s/blog_704836f40102w243.html
	# http://thread.gmane.org/gmane.comp.web.haproxy/12557
	# https://serverfault.com/questions/678882/is-there-a-way-to-rate-limit-connections-with-haproxy-using-
	# https://blog.codecentric.de/en/2014/12/haproxy-http-header-rate-limiting/
	# http://cbonte.github.io/haproxy-dconv/1.9/management.html
	# https://www.haproxy.com/blog/websockets-load-balancing-with-haproxy/

	server {
	listen 443 ssl http2;
	listen [::]:443 ssl http2;
	server_name yourdomain

	ssl_certificate /etc/ssl/localcerts/yourdomain.crt;
	ssl_certificate_key /etc/ssl/localcerts/yourdomain.key;
	ssl_ecdh_curve prime256v1;

	ssl_session_cache builtin:1000 shared:SSL:10m;