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# Puppet Module: `reboot`

## Overview

Triggers a system reboot on nodes that have been running for more than 30 days. The reboot command is OS-aware and resolves to the appropriate shutdown utility for the managed node's kernel.

---

## Source

```puppet
class reboot {
  if $facts[kernel] == "windows" {
    $cmd = "shutdown /r"
  } elsif $facts[kernel] == "Darwin" {
    $cmd = "shutdown -r now"
  } else {
    $cmd = "reboot"
  }
  if $facts[uptime_days] > 30 {
    exec { 'reboot':
      comma

# Puppet Module: `packages`

## Overview

Manages package installation across nodes. Ensures `python-requests` is present on all managed nodes, with additional OS-family-specific packages installed depending on the distribution.

---

## Source

```puppet
class packages {
  package { 'python-requests':
      ensure => installed,
  }
  if $facts[os][family] == "Debian" {
    package { 'golang':
      ensure => installed,
    }
  }
  if $facts[os][family] == "RedHat" {
    package { 'nodejs':
    

# Puppet Module: `machine_info`

## Overview

Collects and writes system information to a local file on the managed node. The output path is OS-aware — it resolves to the appropriate temp directory depending on the host's kernel.

---

## Source

```puppet
class machine_info {
  if $facts[kernel] == "windows" {
      $info_path = "C:\Windows\Temp\Machine_Info.txt"
  } else {
      $info_path = "/tmp/machine_info.txt"
  }
  file { 'machine_info':
      path    => $info_path,
      content => temp

# Linux Command Reference

A categorized reference guide for common Linux/Unix shell commands.

---

## 1. Basic Output & System Info

| Command | Description |
|--------|-------------|
| `echo Hello World` | Prints `Hello World` to the terminal |
| `date` | Displays the current date and time |
| `whoami` | Prints the current logged-in username |

---

## 2. Navigation

| Command | Description |
|--------|-------------|
| `pwd` | Print Working Directory — shows the full path of the current direc

# NVM Command Reference

A reference guide for [NVM (Node Version Manager)](https://github.com/nvm-sh/nvm) — a tool for managing multiple Node.js versions on the same machine.

---

## Installation

```bash
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/master/install.sh | bash
```

Downloads and runs the NVM install script via `curl`. After installation, restart your terminal or source your shell config (e.g. `source ~/.bashrc`).

---

## Verify Installation

| Command | Description |
|-

# Elasticsearch Commands Reference

> Reference: [Complete Guide to Elasticsearch](https://github.com/codingexplained/complete-guide-to-elasticsearch)

---

## Table of Contents

1. [Cluster & Node Monitoring](#1-cluster--node-monitoring)
2. [Index Management](#2-index-management)
3. [Document CRUD](#3-document-crud)
4. [Scripted Updates](#4-scripted-updates)
5. [Upserts](#5-upserts)
6. [Bulk Operations](#6-bulk-operations)
7. [Multi-Get](#7-multi-get)
8. [Search Queries](#8-search-queries)
9. [

# Batcher Generator — Both Implementations

A private TypeScript generator method that splits an array of string tuples into chunks of a given size. Two implementations exist, each with different trade-offs.

---

## Implementation A — Index-based (`slice`)

```ts
private* batcher(aggs: [string, string][] = [], batchSize: number = 5) {
  let j = 0;
  for (let i = 0; i < aggs.length; i += batchSize) {
    j = i + batchSize;
    yield aggs.slice(i, j);
  }
}
```

### How It Works

1. Iterates over

# ⏱️ Performance Measurement — Node.js

Utilities for measuring execution time of async service calls using the `perf_hooks` API.

---

## Snippet 1 — Single Call Measurement

Wraps a single async operation to measure its execution time in milliseconds.

```typescript
import { performance } from 'perf_hooks';

const start = performance.now();

// Replace with your async service call
const result = await myService.doSomething(params);

const end = performance.now();
const elapsed = end - start;

# Commit Workflow — Toolchain & Execution Flow

> Enforced formatting · Standardized commit messages · Mandatory JIRA traceability

---

## Toolchain Overview

| Tool | Role |
|---|---|
| **Commitizen** (`cz`) | Interactive prompt to build a conventional commit message |
| **@commitlint/cz-commitlint** | Adapter that powers the Commitizen prompt with commitlint rules |
| **Husky** | Manages and runs Git hooks at the right lifecycle points |
| **lint-staged** | Runs Prettier on staged `.ts` files

# VS Code Workspace Setup

## Prerequisites

Open a Linux terminal and run the following:

```bash
cd projects
nano core-api.code-workspace
```

Paste the following configuration:

```json
{
    "folders": [
        {
            "path": "./core-api"
        }
    ],
    "settings": {
        "terminal.integrated.cwd": "${workspaceFolder}",
        "terminal.integrated.defaultProfile.linux": "bash"
    },
    "remoteAuthority": "wsl+Ubuntu"
}
```

Save and exit: `Ctrl + X` → `Y` → `Enter`

---

<div class="card-grid">
  <div class="card">
    <div class="card-header">カードタイトル1</div>
    <div class="card-body">カードの内容がここに入ります。長いテキストでも高さが揃います。長いテキストでも高さが揃います。長いテキストでも高さが揃います。長いテキストでも高さが揃います。</div>
    <div class="card-footer">フッター</div>
  </div>
  
  <div class="card">
    <div class="card-header">カードタイトル2</div>
    <div class="card-body">短い内容</div>
    <div class="card-footer">フッター</div>
  </div>
  
  <div class="card">
    <div class="card-header">カードタイトル3</div>
    <div class="card-body"

（Peek）
https://adesignl.github.io/Peek/

body {
  min-height: 100dvh;
}

footer {
  position: sticky;
  top: 100%;
}

/* 画面幅いっぱいに表示 */
.photo {
  width: 100vw;
  margin-inline: calc(50% - 50vw);
}

/* 画面幅左半分に表示 */
.photo {
  width: 50vw;
  margin-left: calc((50vw - 50%) * -1);
}

/* 画面幅右半分に表示 */
.photo {
  width: 50vw;
  margin-right: -50vw;
}

.button {
  border-radius: 100vmax;
}

.parent {
  display: grid;
  place-content: center;
}