Docker 项目部署教程：先说明端口、卷、环境变量和健康检查

import http from 'node:http';
import { access, readFile, writeFile } from 'node:fs/promises';
import { constants } from 'node:fs';
const file = '/app/data/note.txt';
const server = http.createServer(async (req, res) => {
  try {
    if (req.url === '/healthz') { await access('/app/data', constants.W_OK); res.end('ready'); return; }
    if (req.url === '/note' && req.method === 'POST') {
      let body = ''; for await (const part of req) body += part;
      await writeFile(file, body); res.end('saved'); return;
    }
    if (req.url === '/note' && req.method === 'GET') { res.end(await readFile(file)); return; }
    res.writeHead(404); res.end('not found');
  } catch (error) { res.writeHead(error.code === 'ENOENT' ? 404 : 503); res.end(error.code || 'unavailable'); }
});
server.listen(3000, '0.0.0.0');
process.on('SIGTERM', () => server.close(() => process.exit(0)));

FROM node:22-alpine
WORKDIR /app
RUN mkdir -p /app/data && chown node:node /app/data
COPY --chown=node:node server.mjs /app/server.mjs
USER node
EXPOSE 3000
CMD ["node", "server.mjs"]

services:
  app:
    build: .
    ports:
      - "127.0.0.1:8080:3000"
    volumes:
      - lesson-data:/app/data
    healthcheck:
      test: ["CMD", "node", "-e", "fetch('http://127.0.0.1:3000/healthz').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"]
      interval: 10s
      timeout: 3s
      retries: 3
volumes:
  lesson-data:

docker compose config
# 确認只有本例端口和命名卷后启动
docker compose up -d --build
docker compose ps
Invoke-WebRequest 'http://127.0.0.1:8080/healthz'
Invoke-WebRequest 'http://127.0.0.1:8080/note' -Method Post -Body 'lesson-persist-1'
(Invoke-WebRequest 'http://127.0.0.1:8080/note').Content
docker compose up -d --force-recreate
# 等到health为healthy后再次读取，预期仍为lesson-persist-1
(Invoke-WebRequest 'http://127.0.0.1:8080/note').Content
docker compose logs --tail 50 app
# 停止练习并保留卷：
docker compose down