镜像打包优化Node Alpine

1. 多阶段构建

   # 构建阶段
   FROM node:18-alpine AS builder

安装构建依赖

RUN apk add --no-cache python3 make g++

WORKDIR /app COPY package*.json ./ RUN npm ci --only=production

COPY . . RUN npm run build

运行阶段

FROM node:18-alpine

WORKDIR /app

只复制生产环境需要的文件

COPY --from=builder /app/dist ./dist COPY --from=builder /app/node_modules ./node_modules COPY package*.json ./

使用非 root 用户运行

USER node

CMD ["node", "dist/index.js"]

2. 缓存优化
```dockerfile
FROM node:18-alpine

WORKDIR /app

# 分离依赖安装和应用代码
COPY package*.json ./
RUN npm ci --only=production

# 复制应用代码
COPY . .

CMD ["node", "index.js"]

3. 减小镜像体积

   FROM node:18-alpine

WORKDIR /app

合并命令减少层数

COPY package*.json ./ RUN npm ci --only=production &&
npm cache clean --force

删除不必要的文件

RUN rm -rf /tmp/* &&
rm -rf ~/.npm &&
find /usr/local/lib/node_modules -type f -name ".md" -delete &&
find /usr/local/lib/node_modules -type f -name ".ts" -delete

COPY . . CMD ["node", "index.js"]