teleren/devto huggingface dataset:
Troubleshooting "502 Bad Gateway" Error in Kubernetes
Published: 2023-07-14 04:04:04

**Introduction:**
The "502 Bad Gateway" error is a common issue encountered in Kubernetes clusters when there is a problem with the communication between components such as ingress controllers, load balancers, or services. In this blog post, we will discuss the steps to troubleshoot and resolve this error, helping you get your Kubernetes cluster up and running smoothly.

Verify service availability:

* Start by checking if the service you are trying to access is running and available. Use the kubectl get services command to list the services and ensure they are in a healthy state. If any services are not running as expected, investigate further. 

Check ingress configuration:

* If you are using an ingress controller, review the ingress configuration to ensure it is correctly defined. Check the ingress rules, backend services, and paths to ensure they are properly configured. Any misconfiguration in the ingress setup can result in a "502 Bad Gateway" error. 

Inspect pod and container status:

* Validate that the pods associated with the service are running without errors. Use the kubectl get pods command to check the status of the pods. If any pods are not running or have encountered errors, investigate the logs of those pods for more information. Understanding the root cause of pod failures can help in troubleshooting the error. 

Examine load balancer settings:

* If a load balancer is in use, confirm its configuration and ensure it is correctly forwarding traffic to the appropriate backend services. Check the load balancer health checks to ensure they are passing. Misconfigurations in load balancer settings can lead to "502 Bad Gateway" errors. 

Check network connectivity:

* Ensure that the network connectivity between the client and the Kubernetes cluster is functioning correctly. Check for any network issues, firewalls, or security group rules that might be blocking the traffic. A disruption in network connectivity can cause communication problems and result in the error. 

Review application logs:

* Inspect the logs of the application running inside the pod to identify any errors or issues that might be causing the "502 Bad Gateway" error. Look for relevant error messages or exceptions that could provide insights into the problem. Application-level issues can contribute to the error and should be addressed accordingly. 

Scale resources:

* Consider scaling up the resources if the issue is related to resource constraints. Increasing the number of pods or replicas can help handle the incoming traffic more effectively. Ensure that your cluster resources are appropriately sized to meet the demand.  

**Conclusion:**
Encountering a "502 Bad Gateway" error in a Kubernetes cluster can be frustrating, but with systematic troubleshooting steps, you can resolve the issue and restore proper functionality. By verifying service availability, reviewing configurations, inspecting pod and container statuses, and checking network connectivity, you can identify and address the underlying cause of the error.
Command Line Application: Bank Loan Tracker [Node]
Tags: node, javascript, tutorial, npm
Published: 2023-07-14 03:58:37

This is a new tutorial on how to create a command line interface application, and our application today is a Mortgage Calculator.
I used in this program packages such as 
1- inquirer for interactive questions and answers: https://www.npmjs.com/package/inquirer
2- Sqlite3 DBMS
3- Chalk for colorful output in the terminal:
https://www.npmjs.com/package/chalk

The main idea of the app is you ask for a loan amount from the bank, so you'll be prompted to enter the amount.
Similarly for the number of months you want to repay the principle + interest.
Then the program calculates the monthly installment you should pay in this case.
It creates a database file to store all users data with their respective IDs - Sqlite3 does a good job here.
This might seem a small app, but actually it took me quite a while to figure out how to put the various code blocks together in order to get to that result.
You'll find the source code in my GitHub repo:
https://github.com/BekBrace/loan-calculator-cli
There is also a video tutorial, if you're interested to watch my explanationL
{%youtube HEmPSr4SR9M%}

Don't hesitate to contact me if you have any question :)
https://www.linkedin.com/company/96446812/admin/feed/posts/
https://www.facebook.com/bekbrace
https://www.instagram.com/bek_brace
https://www.twitter.com/bekbrace
Python Data Science Cheat Sheets (a WIP project)
Tags: python, datascience, jupyter, cheatsheet
Published: 2023-07-14 03:48:39

I am doing a Data Science bootcamp through [Le Wagon](https://www.lewagon.com/). I have found static cheat sheets that I have turned into interactive versions using Jupyter Notebooks so that I can better understand the packages available for use.

I might be re-inventing the wheel but this approach is helping me reinforce the knowledge and properly explore the packages. 

If you are interested, [check it out](https://github.com/cbillowes/cheat-sheets/), star it, fork it, clone it, contribute to it, share it.

It's a work in progress project. From one package starting with `numpy`, I am hoping to grow it into numerous packages that make sense.

If you have any thoughts, suggestions or words of encouragement 😉, please let me know.

Made with ❤️ for Data Science 🔬 🧮 and Python 🐍
DevBlog #0 Introduction
Tags: development
Published: 2023-07-14 03:45:22

Hello Everyone!

I'm a DevOps Engineer who is passionate about technology, and I've always wanted to start a development blog. I've had many different ideas, but nothing that I truly wanted to pursue.

Recently, I've become interested in OSR (Old School Renaissance/Revival) TTRPG Books due to their art style and fantasy content. I've enjoyed video games such as Fallout, Diablo, and Disco Elysium, which have a rich amount of content and lore.

I've been working on some game concepts to create a hybrid between a video game and a TTRPG. Therefore, I'm starting a series of development articles to document my progress.

Next: [DevBlog #1 Autogenerated descriptions using OpenAI](https://dev.to/chuymarin/development-blog-1-4kg9)
Empowering Software Testing with Contextual Insights and Generative AI
Tags: beginners, tutorial, programming, devops
Published: 2023-07-14 03:30:00

Software testing is an essential part of the development process, ensuring the quality and reliability of software applications. SapientAI revolutionizes software testing by combining contextual insights, code intelligence, and generative AI to automate the entire spectrum of testing. 

[Jump straight to the LINK](https://www.aiforme.wiki/ai/tools/sapientai)

**Uncovering Design Flaws:**

Early identification of design flaws is crucial for building high-quality software. With SapientAI, developers can analyze their code and identify potential design flaws before they escalate into major problems. By focusing on creating unit testable code, developers can catch issues early in the development process, ensuring the stability and reliability of their software.

**Discovering Comprehensive Test Cases:**

Investing in comprehensive test coverage is key to building robust software. SapientAI enables developers to create automated test suites that provide continuous test coverage throughout the development process. By ensuring that code remains functional and performs as expected, developers save time and resources in the long run, avoiding potential issues and bugs.

**Generating High-Quality Test Code:**

The quality of test code is as crucial as the source code itself. SapientAI emphasizes the importance of well-designed and well-maintained test code to ensure software reliability and ease of maintenance. By generating high-quality test code automatically, developers can identify potential issues and bugs early on, saving time and resources in the long run.

**Maintaining Test Code:**

Test code maintenance is essential for ensuring ongoing software functionality and reliability. With SapientAI, developers can maintain their test code effectively, allowing for seamless updates to the codebase without introducing new issues or bugs. Well-maintained test code guarantees that software remains reliable over time, providing peace of mind for developers.

**Discover the Magic of AI Test Coder:**

SapientAI's Test Coder is a groundbreaking platform that combines contextual insights, code intelligence, and generative AI to automatically write valid test code within complex software environments. By leveraging the power of AI, Test Coder eliminates the need for manual test code generation, streamlining the testing process and enhancing efficiency.

**Get Started with SapientAI:**

Experience the transformative power of SapientAI by visiting our website and exploring the features and benefits it offers. Book a demo to see SapientAI in action and witness how it can revolutionize your software testing workflows.

Watch the video showcasing SapientAI's interface with the IntelliJ code editor, demonstrating its seamless integration into your development environment.

[Join the future of software testing.](https://www.aiforme.wiki/ai/tools/sapientai)
Cloud9 from AWS 🚀: pt 2
Tags: aws, cloudcomputing, machinelearning
Published: 2023-07-14 03:27:58

## Launching CodeWhisperer


Once Cloud9 is [up and running on and EC2](https://dev.to/andrewtdunn/cloud9-from-aws-pt-1-13g0)CodeWhisperer is a cool feature to enable. Billed as AI-infused code enhancer, CodeWhisperer takes plain-English comments as input and generates code ranging from snippets to complete functions. For years there has been an evolution towards higher-level languages in web development. Developing with pure Javascript is now an anomaly; the trend has been towards frameworks like coffeescript, react and typescript compile to javascript via webpack. CodeWhisperer takes higher level language development by infusing AI. 

Enabling CodeWhisperer is possible through the AWS button on and then the left menu of Cloud9 UI.
 
![enable CodeWhisperer](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/98uoupt2akdzj015ld5v.png)

Once enabled, CodeWhisperer provides code suggestions based on millions of line of code which were compiled into a Large Language Model. 

![CodeWhisperer code hinting ](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/g4ws04sy3bwktpruw3of.png)

At the Individual Tier (free level), CodeWhisperer also provides security scans and reference mapping. 🚀
Load Testing using K6 in AWS and Terraform
Tags: testing, aws, grafana, k6
Published: 2023-07-14 03:21:40

## Summary:
This article talks about how you can deploy your K6 tests in AWS using Terraform and execute them from Gitlab pipeline.

## Tools:

1. K6 load testing framework.
2. Grafana.
3. InfluxDB.

## Steps:

1. Build an EC2 instance to run k6 using the following code:

```
provider "aws" {
  region  = "us-west-2"
  version = "~> 2.8"
}

data "template_file" "user_data" {
  template = file("${path.module}/_templates/k6_data.sh")
}

# The EC2 instance
resource "aws_instance" "k6_instance" {
  
  ami           = var.ami
  instance_type = var.instance_type
  key_name      = var.key_pair
  user_data     = data.template_file.user_data.rendered
  vpc_security_group_ids = ["${aws_security_group.default.id}"]
  subnet_id = var.key_pair

}
```
In the parent folder create a file named k6_data.sh under templates folder and add the script to install k6. This will run after the instance is started.

```
wget https://bintray.com/loadimpact/rpm/rpm -O bintray-loadimpact-rpm.repo
sudo mv bintray-loadimpact-rpm.repo /etc/yum.repos.d/
sudo yum install -y k6
```
In the similar way we need to create instances for Grafana and influx DB to run and add user data configs which will be initiated once the EC2 instances are up.

For Grafana:

```
wget https://dl.grafana.com/oss/release/grafana-7.1.0-1.x86_64.rpm
sudo yum install -y grafana-7.1.0-1.x86_64.rpm
sudo service grafana-server start
sudo /sbin/chkconfig --add grafana-server
```

For Influx DB:

```
wget https://dl.influxdata.com/influxdb/releases/influxdb-1.7.6.x86_64.rpm
sudo yum localinstall -y influxdb-1.7.6.x86_64.rpm
sudo systemctl enable influxdb.service
```
In Influx DB after installing the service we need to create data directories, Users and a database.

This should be done after starting the service using systemctl

```
influx -execute "create user admin with password 'mongoose123' with all privileges"
influx -execute "create user itguy with password 'itguy123' "
influx -execute "create database k6LoadTestDB"
influx -execute "grant ALL on k6LoadTestDB to grafana"

```

In order for Grafana to run generate reports from the data in Influx DB during test execution we need to configure Grafana to listen to the port in the Load Balancer. 

Hope this article helps !!!!
Benchmark Kubernetes CNI
Published: 2023-07-13 09:44:00

I was configuring recently Calico on a RKE2 cluster. I wanted to test the network performance of the CNI and check, if it can achieve the 100Gbps bandwidth of the NIC.

[iperf3](https://iperf.fr/) is a great tool for this, but unfortunately, it is single threaded and the test was CPU bound.

To overcome this, I wrote a simple script, which runs multiple iperf3 tests on a Kubernetes cluster. The tool is available on [my Github](https://github.com/Trojan295/k8s-utils/tree/main/cmd/k8siperf3).

You have to provide the node for the iperf3 servers and clients and the number of parallel tests. The scripts then starts iperf3 servers, gets their pod IPs and starts a client for each server. At the end of the test, it sums the bitrate of all the tests.

The results might be a bit off, as the client pods might not start and end at the same time. That's why the scripts discards the first and last 15 seconds of measurements.

When I compared the results from the script to the numbers in `nload vxlan.calico` they were pretty close.

```bash
❯ go run ./cmd/k8siperf3 --parallel-count 8 \
	--client-node-name node-1 --server-node-name node-2
2023/07/13 11:35:40 Creating 8 iperf3 server pods
2023/07/13 11:35:41 Waiting for iperf3 server pods to start
2023/07/13 11:35:45 iperf3 server pod 0 IP address: 10.42.113.216
2023/07/13 11:35:45 iperf3 server pod 1 IP address: 10.42.113.218
2023/07/13 11:35:46 iperf3 server pod 2 IP address: 10.42.113.211
2023/07/13 11:35:46 iperf3 server pod 3 IP address: 10.42.113.212
2023/07/13 11:35:47 iperf3 server pod 4 IP address: 10.42.113.213
2023/07/13 11:35:47 iperf3 server pod 5 IP address: 10.42.113.214
2023/07/13 11:35:47 iperf3 server pod 6 IP address: 10.42.113.195
2023/07/13 11:35:47 iperf3 server pod 7 IP address: 10.42.113.196
2023/07/13 11:35:47 Creating 8 iperf3 client pods
2023/07/13 11:35:47 Waiting for iperf3 client pods to finish
2023/07/13 11:36:53 iperf3 client pod 0 finished
2023/07/13 11:36:53 iperf3 client pod 1 finished
2023/07/13 11:36:53 iperf3 client pod 2 finished
2023/07/13 11:36:54 iperf3 client pod 3 finished
2023/07/13 11:36:54 iperf3 client pod 4 finished
2023/07/13 11:36:55 iperf3 client pod 5 finished
2023/07/13 11:36:55 iperf3 client pod 6 finished
2023/07/13 11:36:55 iperf3 client pod 7 finished
Bitrate: 86.589250 Gbits/sec
```
Game B52 - Chơi Đánh Bài Đổi Thưởng Online
Published: 2023-07-14 03:08:25

https://b52news.com/ Game B52✔️ Chơi đánh bài đổi thưởng uy tín trên ios✔️ android✔️ pc: Tiến lên, Poker✔️ Phỏm, Tài xỉu✔️ Nổ hũ, Bắn cá✔️✔️✔️
https://www.gta5-mods.com/users/b52newscom
https://www.hackathon.io/b52newscom
https://www.last.fm/user/b52newscom
https://www.metooo.io/u/b52newscom
https://www.mixcloud.com/b52newscom/
How to make responsible website with css.
Tags: css
Published: 2023-07-14 02:11:00


As a backend engineer myself, I had never really thought about responsive design or anything related to css.
So I am going to take a look at what I learned in school about media Query and introduce it to you.
When I thought about creating a responsive website, I first came up with the idea of using userAgent for responding.
Because, although not all of the information is completely reliable, I thought it would be possible to determine the browser and what type of device the access is coming from, so that we could sort out the style sheets to be applied in more detail.
However, using certain techniques in CSS, it is possible to create a site with a responsive design without having to implement the sorting that you don't really want to do.

## @media Query
With media query, you can change the design to fit the width of the screen.

### example code with link tag

```
// default stylesheet
<link rel="stylesheet" href="css/style.css">
// this will be apply until width 480px
<link rel="stylesheet" href="css/mobile.css" media="screen and (max-width: 480px)">
```

You can use multiple style sheets.

```
// this will be apply until width 480px
<link rel="stylesheet" href="css/mobile.css" media="screen and (max-width: 480px)">
// this will be apply from 480px to 1024px
<link rel="stylesheet" href="css/tablet.css" media="screen and (min-width:480px) and ( max-width:1024px)">
// this will be apply from 1024px
<link rel="stylesheet" href="css/desktop.css" media="screen and (min-width:1024px)">
```

Or, you can make it short.

```
// this will be apply until width 480px
<link rel="stylesheet" href="css/mobile.css" media="screen and (max-width: 480px)">
// this will be apply until width 768px
<link rel="stylesheet" href="css/tablet.css" media="screen and (max-width:768px)">
// this will be apply until width 1024px
<link rel="stylesheet" href="css/tablet.css" media="screen and (min-width:1024px)">
```

### example code in css
```
@media (min-width: 480px) {}
```

### example code with @import
```
@import "mobstyle.css" screen and (max-width: 480px);
```

One thing to note about this technique is that all sheets are exchanged regardless of the device from which the request is made.
Therefore, if too large a sheet is implemented using this technique, unnecessary files will be exchanged during HTTP communication.
I consider it an easy and effective technique for creating static, lightweight sites.

I believe that being able to use a variety of technologies and think about what I want to implement in multiple ways is very important for my future growth as an engineer.
I would like to continue to acquire knowledge in a variety of fields regardless of what specialty I have.

Thank you for reading this.
Learning math python Golang and Haskell
Published: 2023-07-14 01:42:32

In the age of ai, much of developers and engineers these days think there is no need to learn math and fundamentals of computer i believe that is not true in fact more and more you need a really good solid background in computer science physics and mathematics to be better as a software engineer, and realize that software is more then webdevolpment and also ai(although is important), for those reasons im in a journey to learn mathematics and computer science  for the ground up,   

## python haskell and golang  

first off all why im using tree different languages to learn computer science!? 

Well the answer is very short, because i like the tree languages and i think that these tree languages will have a very substancial use in the ages to come in these years . 

## My background in mathematics. 

i will be sincere im not the best mathematician, in fact im quite bad it, but i believe that with hard work, dedication and  consistency you can be at least a good problem solver since mathematics is a good tool to be not only a good a software engineer but a better engineer,  

### Concrete examples  

For this journey im gonna use mathematics to explain the various uses of algorithms and data structure with examples in real life, im gonna show how mathematics can be used to help us solve our problems that we encounter daily.  


## Journey and Learning Plan. 

For the first part im gonna learn pre algebra and basic algorithms to learn more about math and how i can use in daily life, also im gonna compare different programs with different languages(python,golang and haskell) and how they are use in the same scenario. 

im gonna learn how to use funcions,variables and logical operators in the sense of solving real world problems.
toolkit-use npm package have added some functions
Tags: javascript, programming, opensource, typescript
Published: 2023-07-14 00:40:57

https://kennana.github.io/toolkit-use/guide/date/date.html

## 日期格式化示例
```vue
<script setup lang="ts">
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"

const date = new Date()

const str = ToolkitUseDate.formatDate(date, 'yyyy-MM-dd HH:mm:ss')
</script>
```

### formatDate 参数说明

| 参数        | 说明 | 值类型
| ----------- | --------------------------------------- | ------------------------------------------------------------------------------------ |
| dateObj | date实例 | date |
| format | 格式化 | string |

## 判断润年

```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.isLeap(year: number)
```

## 获取星期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.getWeek(date: Date | string)
```

## 获取月份天数
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.getMonthDays(year: number, month: number)
```

## 数字补零
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.padLeftZero(str: number)
```

## 获取今天日期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.getToday(str = 'yyyy-mm-dd')
```

## 获取上一天日期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.getYesterday(str: string)
```

## 获取下一天日期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.getTomorrow(str: string)
```

## 获取前n天日期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.beforeNDay(date: string, n: number)
```

## 获取后n天日期
```ts
import { ToolkitUseDate } from "toolkit-use/dist/date/index.esm"
ToolkitUseDate.afterNDay(date: string, n: number)
```