1~
2Serverless computing cho phep ban chay code ma khong can quan ly server. Ban viet cac ham, trien khai chung va nen tang se xu ly viec mo rong, kha dung va ha tang. Trong nam 2026, ba nen tang thong tri boi canh serverless: **AWS Lambda**, **Vercel Serverless Functions** va **Cloudflare Workers**. Moi nen tang co nhung the manh va danh doi khac nhau.
3~
4Trong bai viet nay, chung toi so sanh chung voi cac vi du thuc te, cac can nhac ve hieu suat va phan tich gia.
5~
6## Serverless hoat dong nhu the nao
7~
8```mermaid
9graph LR
10    User -- "HTTP Request" --> Gateway[API Gateway / Edge]
11    Gateway -- "Invoke" --> Function[Serverless Function]
12    Function -- "Response" --> User
13    Function -- "Read/Write" --> DB[(Database)]
14```
15~
16Ban trien khai mot ham. Khi mot yeu cau den, nen tang se:
171. Khoi tao moi truong thuc thi (hoac tai su dung mot moi truong da san sang)
182. Chay ham cua ban
193. Tra ve phan hoi
204. Thu nho ve khong khi khong hoat dong (ban khong tra phi cho thoi gian nghi)
21~
22## Tong quan nen tang
23~
24### AWS Lambda
25~
26Nen tang serverless dau tien (ra mat nam 2014). Chin muoi nhat va giau tinh nang nhat, voi tich hop sau vao he sinh thai AWS.
27~
28```javascript
29// AWS Lambda handler
30export const handler = async (event) => {
31  const body = JSON.parse(event.body);
32~
33  const result = await processData(body);
34~
35  return {
36    statusCode: 200,
37    headers: { 'Content-Type': 'application/json' },
38    body: JSON.stringify(result),
39  };
40};
41```
42~
43### Vercel Serverless Functions
44~
45Tich hop chat che voi Next.js va quy trinh trien khai frontend. Cac ham duoc trien khai cung voi frontend cua ban ma khong can cau hinh.
46~
47```typescript
48// app/api/hello/route.ts (Next.js App Router)
49import { NextResponse } from 'next/server';
50~
51export async function GET(request: Request) {
52  const { searchParams } = new URL(request.url);
53  const name = searchParams.get('name') || 'World';
54~
55  return NextResponse.json({ message: `Hello, ${name}!` });
56}
57```
58~
59### Cloudflare Workers
60~
61Chay tren mang edge cua Cloudflare tai hon 300 thanh pho tren toan the gioi. Su dung V8 engine (giong nhu Chrome) thay vi Node.js, co nghia la cold start cuc ky nhanh.
62~
63```javascript
64// Cloudflare Worker
65export default {
66  async fetch(request, env) {
67    const url = new URL(request.url);
68    const name = url.searchParams.get('name') || 'World';
69~
70    return new Response(
71      JSON.stringify({ message: `Hello, ${name}!` }),
72      { headers: { 'Content-Type': 'application/json' } }
73    );
74  },
75};
76```
77~
78## So sanh tinh nang
79~
80| Tinh nang | AWS Lambda | Vercel Functions | Cloudflare Workers |
81|---------|-----------|-----------------|-------------------|
82| **Runtime** | Node.js, Python, Go, Rust, Java, .NET | Node.js, Python, Go, Ruby | V8 Isolates (JS/TS, Rust via WASM) |
83| **Thoi gian thuc thi toi da** | 15 phut | 60s (Hobby), 300s (Pro) | 30s (mien phi), 15 phut (tra phi) |
84| **Bo nho** | 128MB - 10GB | 1024MB - 3008MB | 128MB |
85| **Cold start** | 100-500ms | 100-300ms | < 5ms |
86| **Vi tri trien khai** | Mot vung (hoac nhieu vung voi no luc) | Nhieu vung | 300+ vi tri edge |
87| **Payload toi da** | 6MB (dong bo), 256KB (bat dong bo) | 4.5MB | 100MB |
88| **Luu tru tich hop** | Khong (su dung DynamoDB, S3) | Khong (su dung DB ben ngoai) | KV, D1 (SQLite), R2 (tuong thich S3) |
89| **Mo hinh gia** | Theo yeu cau + thoi luong | Bao gom trong goi | Theo yeu cau + thoi luong |
90| **Goi mien phi** | 1M yeu cau/thang | 100K/thang (Hobby) | 100K yeu cau/ngay |
91~
92## Cold Start
93~
94Cold start la thoi gian can de khoi tao mot instance ham moi. Day la moi quan tam lon nhat ve hieu suat voi serverless.
95~
96```mermaid
97graph LR
98    subgraph "Cold Start"
99        A[Request] --> B[Provision Environment]
100        B --> C[Load Code]
101        C --> D[Initialize Runtime]
102        D --> E[Execute Function]
103    end
104~
105    subgraph "Warm Invocation"
106        F[Request] --> G[Execute Function]
107    end
108```
109~
110| Nen tang | Cold Start dien hinh | Ly do |
111|----------|-------------------|-----|
112| **Cloudflare Workers** | < 5ms | V8 isolate, khong can runtime day du |
113| **Vercel Functions** | 100-300ms | Runtime Node.js tren edge hoac vung |
114| **AWS Lambda** | 100-500ms | Khoi tao container day du |
115| **AWS Lambda (Java)** | 1-5 giay | Chi phi khoi dong JVM |
116~
117Cloudflare Workers thang cold start voi khoang cach lon vi su dung V8 isolate thay vi container.
118~
119## So sanh gia
120~
121### Goi mien phi
122~
123| Nen tang | Yeu cau mien phi | Tinh toan mien phi |
124|----------|--------------|--------------|
125| **AWS Lambda** | 1M/thang | 400,000 GB-giay |
126| **Vercel** | 100K/thang | Bao gom trong goi Hobby |
127| **Cloudflare Workers** | 100K/ngay (~3M/thang) | 10ms CPU moi lan goi |
128~
129### O quy mo lon (10M yeu cau/thang, thoi luong trung binh 50ms)
130~
131| Nen tang | Chi phi hang thang uoc tinh |
132|----------|----------------------|
133| **AWS Lambda** | ~$2.50 (yeu cau) + ~$4.15 (tinh toan) = **~$6.65** |
134| **Vercel** | **$20/thang** (goi Pro, bao gom ham) |
135| **Cloudflare Workers** | **$5/thang** (goi tra phi, bao gom 10M yeu cau) |
136~
137Voi hau het cac truong hop su dung, Cloudflare Workers la re nhat. Gia cua Vercel don gian nhung bao gom toan bo nen tang (hosting, CDN, analytics). AWS Lambda co gia chi tiet nhat.
138~
139## Truong hop su dung thuc te
140~
141### AWS Lambda: Tot nhat cho
142~
143- **Quy trinh backend phuc tap** - step functions, kien truc huong su kien
144- **Tich hop voi dich vu AWS** - S3 trigger, DynamoDB stream, SQS queue
145- **Tac vu chay lau** - len den 15 phut thoi gian thuc thi
146- **Nhom da ngon ngu** - ho tro pham vi runtime rong nhat
147~
148```mermaid
149graph TD
150    S3[S3 Upload] --> Lambda1[Process Image]
151    Lambda1 --> SQS[SQS Queue]
152    SQS --> Lambda2[Generate Thumbnails]
153    Lambda2 --> DDB[DynamoDB]
154    DDB --> Lambda3[Send Notification]
155    Lambda3 --> SNS[SNS / Email]
156```
157~
158### Vercel Functions: Tot nhat cho
159~
160- **Ung dung Next.js** - API route khong can cau hinh
161- **Nhom tap trung frontend** - trien khai frontend va backend cung nhau
162- **Tao mau nhanh** - git push de trien khai
163- **Kien truc Jamstack** - frontend tinh + serverless API
164~
165```typescript
166// app/api/subscribe/route.ts
167import { NextResponse } from 'next/server';
168~
169export async function POST(request: Request) {
170  const { email } = await request.json();
171~
172  // Validate
173  if (!email || !email.includes('@')) {
174    return NextResponse.json(
175      { error: 'Invalid email' },
176      { status: 400 }
177    );
178  }
179~
180  // Save to database
181  await db.subscribers.create({ email });
182~
183  return NextResponse.json({ success: true });
184}
185```
186~
187### Cloudflare Workers: Tot nhat cho
188~
189- **API do tre thap** - code chay tai hon 300 vi tri tren toan the gioi
190- **Edge computing** - chuyen doi phan hoi, A/B testing, ca nhan hoa
191- **API luu luong cao** - re nhat o quy mo lon voi goi mien phi hao phong
192- **Ung dung toan cau** - du lieu gan nguoi dung voi KV va D1
193~
194```javascript
195// Edge-side A/B test
196export default {
197  async fetch(request, env) {
198    const url = new URL(request.url);
199~
200    // Assign user to variant
201    const cookie = request.headers.get('Cookie') || '';
202    let variant = cookie.includes('ab=b') ? 'b' : 'a';
203~
204    if (!cookie.includes('ab=')) {
205      variant = Math.random() < 0.5 ? 'a' : 'b';
206    }
207~
208    // Fetch the appropriate version
209    const response = await fetch(`${url.origin}/variants/${variant}`);
210    const newResponse = new Response(response.body, response);
211~
212    // Set cookie for consistent experience
213    newResponse.headers.set('Set-Cookie', `ab=${variant}; Path=/; Max-Age=86400`);
214~
215    return newResponse;
216  },
217};
218```
219~
220## Khi nao chon cai nao
221~
222### Chon AWS Lambda neu:
223- Ban da dau tu vao he sinh thai AWS
224- Ban can ham chay lau (len den 15 phut)
225- Ban can kien truc huong su kien phuc tap
226- Ban can runtime ngoai JavaScript (Python, Go, Rust, Java)
227~
228### Chon Vercel Functions neu:
229- Ban dang xay dung voi Next.js hoac framework frontend
230- Ban muon trai nghiem trien khai don gian nhat (git push)
231- Nhom cua ban tap trung vao frontend
232- Ban muon hosting + ham + CDN trong mot nen tang
233~
234### Chon Cloudflare Workers neu:
235- Ban can do tre thap nhat co the tren toan cau
236- Ban muon lua chon re nhat o quy mo lon
237- Ban can kha nang edge computing
238- Thoi gian cold start rat quan trong cho truong hop su dung cua ban
239~
240## Co the ket hop chung khong?
241~
242Chac chan. Mot kien truc pho bien:
243~
244```mermaid
245graph TD
246    User --> CF[Cloudflare Workers\nEdge caching, routing, A/B tests]
247    CF --> Vercel[Vercel\nNext.js frontend + API routes]
248    Vercel --> Lambda[AWS Lambda\nHeavy processing, background jobs]
249    Lambda --> S3[S3 Storage]
250    Lambda --> DB[(Database)]
251```
252~
253- **Cloudflare Workers**: dinh tuyen edge, caching, bao mat
254- **Vercel Functions**: API route frontend, SSR
255- **AWS Lambda**: xu ly backend nang, tac vu dinh ky, pipeline su kien
256~
257## Ket luan
258~
259Serverless da truong thanh dang ke. Trong nam 2026, lua chon giua AWS Lambda, Vercel Functions va Cloudflare Workers phu thuoc vao stack va uu tien cua ban:
260~
261- **Trai nghiem nha phat trien don gian nhat**: Vercel
262- **Manh me va linh hoat nhat**: AWS Lambda
263- **Hieu suat va gia tot nhat**: Cloudflare Workers
264~
265Ca ba deu san sang cho san xuat va da duoc thu nghiem thuc te. Bat dau voi cai phu hop voi stack hien tai cua ban va mo rong khi nhu cau cua ban tang len.
266~