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ouyi /
Last active Oct 16, 2021
Setting up OpenVPN with Docker in a public cloud
# Install docker
yum check-update
curl -fsSL | sh
systemctl start docker
systemctl status docker
systemctl enable docker
systemctl status docker
# Set up the server-side of things
ouyi / auto_scroll.js
Created Nov 23, 2020
Automatically scroll page up and down in JavaScript
View auto_scroll.js
setInterval(() => { window.scrollTo(0, document.body.scrollHeight); window.scrollTo(0, 0); }, 60000)
ouyi /
Created May 24, 2020
# Add the release PGP keys:
curl -s | sudo apt-key add -
# Add the "stable" channel to your APT sources:
echo "deb syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
# Update and install syncthing:
sudo apt-get update
ouyi /
Created Jun 16, 2020
Bash script for displaying the CPU and GPU temperatures of Raspberry Pi 3B+
#!/usr/bin/env bash
# Display the CPU and GPU temperatures of Raspberry Pi 3B+
set -e
cpu_temp=$(printf %.1f $((10 * cpu_temp/1000))e-1)
gpu_temp=$(vcgencmd measure_temp)
ouyi /
Created May 24, 2020
cd $HOME
tar xvf AdGuardHome_linux_arm.tar.gz
cd AdGuardHome
sudo ./AdGuardHome -s install
View german_umlaut_unicode.txt
Char Unicode
Ä \u00c4
ä \u00e4
Ö \u00d6
ö \u00f6
Ü \u00dc
ü \u00fc
ß \u00df
ouyi /
Last active Apr 28, 2019
Frequently used Linux Bash shell commands
# --- Join strings ---
function join_by { local IFS="$1"; shift; echo "$*"; }
# join_by ',' foo bar baz
echo -e "a\nb\nc" | tr '\n' ',' | sed 's/,$//g' # a,b,c
# --- Misc ---
# Retrieve the directory where the current script is in
ouyi / lessons-learned.txt
Created Apr 18, 2019
Lessons learned from the recent years
View lessons-learned.txt
Lessons learned
I. Software engineering
1. Automate everything, have CI/CD and test automation from the beginning
2. Security shall not be an afterthought (have TLS and avoid plain text passwords from the start)
3. Component shall be stateless, state shall be extracted and kept in a external store (key-value store or databases)
4. Favor open source and off-the-shelf solutions instead of building proprietary solutions
5. Avoid hard-coding dependencies, try to inject them via command line parameters, configuration files, env variables, etc
ouyi /
Created Mar 16, 2019
Kafka Python client code
from kafka import KafkaProducer
producer = KafkaProducer(bootstrap_servers=['localhost:19092'])
data = bytes('hello', encoding='utf-8')
producer.send('test', value=data)
from kafka import KafkaConsumer
consumer = KafkaConsumer('test', bootstrap_servers=['localhost:19092'], consumer_timeout_ms=2000, auto_offset_reset='earliest')
event = next(consumer)
ouyi /
Last active Feb 25, 2019
Frequently used Maven commands
# --- Maven ---
# Skip test execution
mvn package -DskipTests
# Skip test compilation
mvn package -Dmaven.test.skip=true
# Retrieve the project version