docker nodejs镜像优化

目标：

1. 镜像体积要小一些。但要满足应用需求，和少量调试需求
2. 推送镜像到仓库的速度要快。npm install 利用docker layer

实现目标1：

1. 选择镜像底
   查看node docker hub文档，推荐slim，因此选了node:10-slim, 包含了bash 、curl
2. 启动应用报错，node-gyp依赖make、gcc、g++、python
3. apt-get更新慢，改用清华源

最终dockerfile

FROM node:10-slim
MAINTAINER 252228148@qq.com

ENV TZ "Asia/Shanghai"

COPY ./sources.list /etc/apt/
# node-gyp require python
RUN set -ex \
  && apt-get update \
  && apt-get install -y make gcc g++ python \
  && rm -rf /var/lib/apt/lists/*

sourcelist

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free

实现目标2

增加.dockerignore，屏蔽掉用不到的目录和文件

node_modules/*
logs/*
.idea/*
.git/*

也参考了[lvwxx] 同学的文章 https://juejin.im/post/5cada976f265da035e210bf8
最终dockerfile

FROM docker.io/pianfeng240/node10 AS builder
WORKDIR /home/app
COPY package.json package-lock.json ./
COPY .npmrc /root
RUN npm install --production

FROM docker.io/pianfeng240/node10
WORKDIR /home/app
COPY --from=builder /home/app/node_modules ./node_modules
COPY . .

EXPOSE 80
CMD ["node", "bin/server"]

验证：
修改后推送镜像到腾讯云的速度大大提高了