Phương Nguyễn ngtrphuong

Setup Kubernetes Cluster On-Premise using kubeadm

Why would you do this?

You own your bare metal infrastructure.
You want to take advantage of Kubernetes.
You do not wish to migrate your application to the cloud

Why it will not always suit your needs?

Get a DDNS up and running with DuckDNS - Step by Step

Understanding DDNS

In summary, DDNS stands for Dynamic DNS. DDNS updates a DNS name in real-time to point to a changing IP address. This is useful for devices without a static IP. For example, companies like Google use static IPs and IP ranges, which are more expensive than ephemeral IPs and IP ranges. DDNS provides a cost-effective alternative, linking a hostname to a dynamic IP address.

How Does DDNS Work?

To use DDNS, you need an account with a DDNS provider. While some services are paid, they are still cheaper than static public IPs from ISPs. A script or service on your device updates the DDNS server with your current IP at regular intervals to maintain the link between your hostname and IP address. Luckily for us, DuckDNS is free for everybody and relays on donations to keep their services running.

Working with development branch and merge with master

Sometimes you want to experiment with a code which you have on your master branch but not want to save it to master branch. In this case, you can create another branch where you can experiment with ease - and if you are satisfied, you can merge the experiment to the master branch later.

Creating development branch

git branch development
git checkout development
git add .
git commit -m "Initial commit on development branch"
git push origin development

Updating a HP(E) server from iLO 3 version 1.55 to version 1.94

This short document explain how to resolve the issues arising when trying to update an old (Gen7) HP(E) server to the most recent iLO 3 (HPE Integrated Lights-Out) version, which solves a great number of security and usability issues.

Issues

Can't connect to iLO with a modern browser, for lack of supported TLS protocol version
- solved by using FirefoxPortable version 31
- and in the Firefox31 portable configuration, in the about:config settings, set security.tls.version.min (the minimum acceptable version of the TLS protocol) to 0 in order to be able to negociate down to TLS 1.0 (even if iLO 3 can do 1.1). Keep in mind your browser is now (even more) vulnerable to a host of attacks, do not connect to any potentially hostile host with it.
in the iLO web console, checking the option "Enforc

Build a flutter app in WSL2

Install, build and debug a flutter app in WSL2 (Windows Subsystem for Linux).

Linux setup

Install Java

To install the JDK, execute the following command, which will also install the JRE:

sudo apt install default-jdk

Add the following two lines to /etc/profile (setting the JAVA_HOME environment variable):

The Job Interview Guide 💼

And English is a Work in Progress ⌛

How to download your Udemy course videos using youtube-dl

$ youtube-dl --list-extractors | grep udemy

Steps

Get link to the course to download. e.g. https://www.udemy.com/course-name/
Login into udemy website, save the cookie from chrome using Chrome (Cookie.txt)[1] export extension. Save it to file udemy-cookies.txt
Get the link of the video that you want to download. usually in format. Use the command provided below where you have to replace the {course_link} and {path_to_cookies_file} with respective paths.

$ youtube-dl {course_link} --cookies {path_to_cookies_file}

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

Generate ssh key pairs for accounts and add them to GitHub accounts.

Carthage to Cocoapods

We recently had the need to align our frameworks to one dependency management system. Previously we were using Carthage and Cocoapods (or both) amongst different frameworks. The burden of supporting both platforms coupled with long build times on our CI/CD drew us away from Carthage. During this conversion I encountered several "gotcha" moments in our Xcode projects that I want to share with others who might be doing the same thing to get you to a clean Cocoapod based build.

Assumptions

You have a working knowledge of Carthage and Cocoapods
You have a working knowledge of Xcode project settings

	Section "Monitor"
	Identifier "Monitor0"
	HorizSync 28.0-80.0
	VertRefresh 48.0-75.0
	# 1024x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 64.11 MHz
	# Modeline "1024x768_60.00" 64.11 1024 1080 1184 1344 768 769 772 795 -HSync +Vsync
	# 1280x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 74.48 MHz
	# Modeline "1280x720_60.00" 74.48 1280 1336 1472 1664 720 721 724 746 -HSync +Vsync
	# 1368x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 85.86 MHz
	# Modeline "1368x768_60.00" 85.86 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync