Dockerfile

# Use an official Node.js runtime as a parent image
FROM node:20.11-alpine3.19 AS base

# 1. Install dependencies only when needed
FROM igorwang/chatapp:v2.0-base AS deps

RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apk/repositories

# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat

WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* .npmrc ./
RUN \
    if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
    elif [ -f package-lock.json ]; then npm ci; \
    elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i; \
    else echo "Lockfile not found." && exit 1; \
    fi
    

# 2. Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# This will do the trick, use the corresponding env file for each environment.
COPY .env.production.local .env.production

RUN yarn build

# 3. Production image, copy all the files and run next
FROM base AS runner

WORKDIR /app

ENV NODE_ENV=production

RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

COPY --from=builder /app/public ./public

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static


USER nextjs

EXPOSE 3000

ENV PORT 3000

CMD node server.js