### Display DirectAdmin Setup File

Source: https://helpdesk.inet.vn/knowledgebase/huong-dan-lay-thong-tin-mat-khau-mac-dinh-mysql-root-tren-direct-admin

Use this command to view the contents of the setup.txt file, which contains default credentials for DirectAdmin installations.

```bash
[root@server ~]# cat /usr/local/directadmin/scripts/setup.txt
```

--------------------------------

### Start and Enable Services

Source: https://helpdesk.inet.vn/knowledgebase/huong-dan-cau-hinh-cacti-tren-centos-65

Start the Apache and MySQL/MariaDB services and enable them to start on boot.

```bash
service httpd start
chkconfig httpd on
service mysqld start
chkconfig mysqld on
```

--------------------------------

### Basic GTK Application Code

Source: https://helpdesk.inet.vn/blog/huong-dan-cach-check-gtk-version-ubuntu

A minimal C code example that initializes GTK, creates a top-level window, shows it, and starts the GTK main loop.

```c
#include 
int main(int argc, char* argv[]){
  GtkWidget *pWindows;
  gtk_init(&argc,&argv);
  pWindows = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_widget_show(pWindows);
  gtk_main();
  return 0;
}
```

--------------------------------

### Successful OPcache Installation Confirmation

Source: https://helpdesk.inet.vn/knowledgebase/cai-dat-opcache-directadmin-giup-tang-toc-website-voi-custombuild-20

Example output showing that OPcache is installed for various PHP versions.

```text
opCache 7.0.6 is now installed for PHP 5.6  
opCache 7.0.6 is now installed for PHP 7.2  
opCache 7.0.6 is now installed for PHP 7.3  
opCache 7.0.6 PHP extension has been installed successfully.
```

--------------------------------

### Example CNAME Configuration

Source: https://helpdesk.inet.vn/knowledgebase/y-nghia-va-cach-su-dung-ban-ghi-cname

This example shows how to set up a CNAME record for 'blog.thuyninh.name.vn' to point to 'thuyninh.name.vn'. This allows both domains to resolve to the same IP address.

```DNS
+ Tên bản ghi: blog
+ Loại bản ghi: CNAME
+ Giá trị bản ghi: thuyninh.name.vn
```

--------------------------------

### Quick Install EmDash

Source: https://helpdesk.inet.vn/blog/emdash-nen-tang-lam-website-the-he-moi

Use the EmDash manager to quickly install EmDash for a specified domain. This command automates the setup of necessary software, SSL certificates, and configurations.

```bash
emdash quickinstall --domain ten-mien-cua-ban.com
```

--------------------------------

### Kiểm tra cài đặt Docker bằng lệnh hello-world

Source: https://helpdesk.inet.vn/blog/huong-dan-cai-dat-docker-desktop-tren-windows

Sau khi cài đặt Docker Desktop, bạn có thể chạy lệnh này để xác minh rằng Docker đang hoạt động chính xác. Lệnh này sẽ tải xuống và chạy một container 'hello-world' đơn giản.

```powershell
PS C:\Users\Administrator> docker run hello-world  
Unable to find image 'hello-world:latest' locally  
latest: Pulling from library/hello-world  
e6590344b1a5: Pull complete  
Digest: sha256:7e1a4e2d11e2ac7a8c3f768d4166c2defeb09d2a750b010412b6ea13de1efb19  
Status: Downloaded newer image for hello-world:latest  
  
Hello from Docker!  
This message shows that your installation appears to be working correctly.
```

--------------------------------

### PHP Version Output with OPcache

Source: https://helpdesk.inet.vn/knowledgebase/cai-dat-opcache-directadmin-giup-tang-toc-website-voi-custombuild-20

Example output of 'php -v' command indicating successful Zend OPcache installation.

```text
PHP 5.6.40 (cli) (built: Mar 27 2019 22:13:46) 
Copyright (c) 1997-2016 The PHP Group 
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
```

--------------------------------

### Set Up Express Server and HTTP

Source: https://helpdesk.inet.vn/blog/socket-io-la-gi-tim-hieu-ve-socket-io

Initialize Express and HTTP server, and import the socket.io library. This is the foundational setup for the server.

```javascript
const app = require("express")();
const http = require("http").createServer(app);
const io = require("socket.io")(http);
```

--------------------------------

### Chạy thử Docker với container 'hello-world'

Source: https://helpdesk.inet.vn/blog/Docker-la-gi-huong-dan-cai-dat-docker-cho-cac-he-dieu-hanh

Sử dụng lệnh này để kiểm tra xem Docker có hoạt động đúng chức năng hay không bằng cách chạy một container mẫu.

```bash
docker run hello-world

```

--------------------------------

### Get Telegram Chat ID

Source: https://helpdesk.inet.vn/blog/huong-dan-theo-doi-ip-truy-cap-vao-vps-va-thong-bao-ve-telegram

Use this URL to retrieve your Telegram chat ID after starting your bot. Replace '<TOKEN_CỦA_BẠN>' with your actual bot token.

```text
https://api.telegram.org/bot<TOKEN_CỦA_BẠN>/getUpdates
```

--------------------------------

### Enable and Start Nginx Service

Source: https://helpdesk.inet.vn/blog/nextcloud-tong-quan-va-cach-cai-dat-co-ban-tren-ubuntu-2404-lts

Enable Nginx to start automatically on boot and start the service immediately. Check its status to ensure it's running correctly.

```bash
systemctl enable nginx
systemctl start nginx
systemctl status nginx
```

--------------------------------

### Connect to Redis with Node.js

Source: https://helpdesk.inet.vn/blog/redis-cache-la-gi-uu-va-nhuoc-diem-khi-su-dung-chung

Establishes a connection to a Redis instance using the 'redis' library in Node.js. Includes basic error handling and examples for setting and getting keys.

```javascript
const redis = require('redis')
const client = redis.createClient()

client.on('error', function (error) {
  console.error(`Redis error: ${error}`)
})

// Example: setting a key
client.set('key', 'value', redis.print)
// Example: getting a key
client.get('key', function (err, reply) {
  console.log(reply) // Prints 'value'
})
```

--------------------------------

### Install VPS Monitoring Script and Schedule Task

Source: https://helpdesk.inet.vn/blog/huong-dan-theo-doi-ip-truy-cap-vao-vps-va-thong-bao-ve-telegram

This script installs the VPS monitoring system by ensuring administrator privileges, checking for the main script's existence, cleaning up old configurations, and registering a new scheduled task to run the monitoring script automatically at startup. It also starts the task immediately.

```PowerShell
# ==========================================
# FILE: Install.ps1
# ==========================================
$TaskName     = "VPS_Auto_Monitor_System"
$CurrentDir = $PSScriptRoot
$ScriptPath = "$CurrentDir\AutoMonitor.ps1"

# 1. KIEM TRA QUYEN ADMIN
$IsAdmin = ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
if (!$IsAdmin) {
  Start-Process PowerShell.exe -ArgumentList "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs
  Exit
}

Clear-Host
Write-Host "--- CAI DAT HE THONG ---" -ForegroundColor Cyan

if (-not (Test-Path $ScriptPath)) {
  Write-Host "❌ LOI: Khong tim thay file AutoMonitor.ps1!" -ForegroundColor Red
  Read-Host "An Enter de thoat..."
  Exit
}

# 2. XOA TASK CU & DUNG TIEN TRINH CU
try {
  Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false -ErrorAction SilentlyContinue
  # Stop tien trinh powershell dang chay file nay neu co
  Get-WmiObject Win32_Process | Where-Object { $_.CommandLine -like "*AutoMonitor.ps1*" } | Stop-Process -Force -ErrorAction SilentlyContinue
  Write-Host "✅ Da don dep cau hinh cu." -ForegroundColor Green
} catch {}

# 3. TAO TASK MOI
try {
  $Action = New-ScheduledTaskAction -Execute "powershell.exe" -Argument "-NoProfile -WindowStyle Hidden -ExecutionPolicy Bypass -File `"$ScriptPath`""
  $Trigger = New-ScheduledTaskTrigger -AtStartup
  $Principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest
  
  # Cho phep chay vo han
  $Settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit (New-TimeSpan -Seconds 0) -RestartCount 3 -RestartInterval (New-TimeSpan -Minutes 1)

  Register-ScheduledTask -TaskName $TaskName -Action $Action -Trigger $Trigger -Principal $Principal -Settings $Settings | Out-Null
  
  # --- QUAN TRONG: CHAY NGAY LAP TUC ---
  Start-ScheduledTask -TaskName $TaskName
  
  Write-Host "`n✅ CAI DAT THANH CONG!" -ForegroundColor Green
  Write-Host "👉 Bot da duoc kich hoat chay ngam NGAY BAY GIO."
  Write-Host "👉 Hay kiem tra Telegram, ban se thay tin nhan 'BOT SYSTEM STARTED'."
}
catch {
  Write-Host "❌ LOI: $($_.Exception.Message)" -ForegroundColor Red
}

```

--------------------------------

### MariaDB Database Setup

Source: https://helpdesk.inet.vn/blog/huong-dan-cai-dat-freeradius-va-daloradius-tren-ubuntu

Commands to connect to MariaDB, create the 'radius' database, and set up a user with privileges.

```bash
$ mysql -u root -p  
Enter password: 
Welcome to the MariaDB monitor. Commands end with ; or \g.  
Your MariaDB connection id is 2180  
Server version: 10.3.8-MariaDB-1:10.3.8+maria~bionic-log mariadb.org binary distribution  
  
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.  
  
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.  
  
MariaDB [(none)]> CREATE DATABASE radius;  
Query OK, 1 row affected (0.000 sec)  
MariaDB [(none)]> GRANT ALL ON radius.* TO radius@localhost IDENTIFIED BY "radiuspassword";  
Query OK, 0 rows affected (0.000 sec)  
MariaDB [(none)]> FLUSH PRIVILEGES;  
Query OK, 0 rows affected (0.001 sec)  
MariaDB [(none)]> quit  
Bye
```

--------------------------------

### Install Packages with yum

Source: https://helpdesk.inet.vn/knowledgebase/mot-so-lenh-co-ban-tren-centos-cho-nguoi-moi-su-dung-linux

Install, update, and remove software packages. Requires root privileges. Use 'yum install <package_name>' to install.

```bash
sudo yum install httpd
```

--------------------------------

### Install New Website

Source: https://helpdesk.inet.vn/blog/emdash-nen-tang-lam-website-the-he-moi

Install a new website on the same server using the EmDash manager.

```bash
emdash install --domain site2.com
```

--------------------------------

### Install pip for Python 3 (Ubuntu)

Source: https://helpdesk.inet.vn/blog/jupyter-notebook-la-gi-huong-dan-su-dung

Installs pip, the package installer for Python, allowing you to install Jupyter Notebook and other Python packages.

```bash
sudo apt-get install python3-pip
```

--------------------------------

### Create Directory

Source: https://helpdesk.inet.vn/blog/cac-lenh-ubuntu-co-ban

Use 'mkdir' to create a new directory.

```bash
mkdir [tên_thư_mục]
```

```bash
mkdir myfolder
```

--------------------------------

### Install RPM Package

Source: https://helpdesk.inet.vn/knowledgebase/mot-so-lenh-co-ban-tren-centos-cho-nguoi-moi-su-dung-linux

Installs a software package from an RPM file (offline installation).

```bash
rpm -ivh đường_dẫn_package
```

```bash
rpm -ivh /media/CentOS/gcc-4.1.2-51.el5.i386.rpm
```

--------------------------------

### Kiểm tra cài đặt Snap với hello-world trên Ubuntu

Source: https://helpdesk.inet.vn/blog/install-snap

Cài đặt và chạy ứng dụng 'hello-world' để xác minh Snap hoạt động chính xác trên hệ thống Ubuntu.

```bash
$ sudo snap install hello-world
hello-world 6.4 from Canonical✓ installed
$ hello-world
Hello World!
```

--------------------------------

### Install Package with YUM

Source: https://helpdesk.inet.vn/knowledgebase/mot-so-lenh-co-ban-tren-centos-cho-nguoi-moi-su-dung-linux

Install a software package using YUM. The -y flag automatically confirms the installation.

```bash
yum install -y mc
```