今天在打包一个Node.js应用镜像的时候，报了一个这样的错：
> sleep@5.1.1 install /usr/src/app/node_modules/sleep
> node-gyp rebuild
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack at PythonFinder.failNoPython (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:483:19)
gyp ERR! stack at PythonFinder.<anonymous> (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:397:16)
gyp ERR! stack at F (/usr/lib/node_modules/npm/node_modules/which/which.js:68:16)
gyp ERR! stack at E (/usr/lib/node_modules/npm/node_modules/which/which.js:80:29)
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/which.js:89:16
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/index.js:42:5
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/mode.js:8:5
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:152:21)
gyp ERR! System Linux 4.9.49-moby
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /usr/src/app/node_modules/sleep
gyp ERR! node -v v8.9.1
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
原来是项目引用了一个第三方的sleep模块，查看文档后发现这个模块是C++编写的，所以需要编译成.node文件。编译的工具是node-gyp，看起来这个工具好像依赖python，但是我的基础镜像只有node的环境。
看来我需要构建一个包含node和python的基础镜像，于是我编写了下面的Dockerfile
FROM mhart/alpine-node:8
## 设置 node-sass 源 和 安装python
RUN npm config set sass_binary_site https://npm.taobao.org/mirrors/node-sass && \
apk add --update \
python \
python-dev \
py-pip \
&& rm -rf /var/cache/apk/*
看起来这样就可以构建出想要的基于node和python的镜像。先运行
docker build -t node-python .
不出意外的话应该可以成功构建我所需要的基础镜像。但是却卡在了这里
Step 3/3 : RUN npm config set registry http://npm-registry.qunhequnhe.com/ && npm config set sass_binary_site https://npm.taobao.org/mirrors/node-sass && apk add --update python python-dev py-pip build-base && rm -rf /var/cache/apk/*
---> Running in f630a6320c4b
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/community/x86_64/APKINDEX.tar.gz
估计是http://dl-cdn.alpinelinux.org这个源访问不到的问题，那就用阿里的源来替代：
FROM mhart/alpine-node:8
# 使用阿里云的源
ENV ALPINE_MIRROR "http://mirrors.aliyun.com/alpine"
RUN echo "${ALPINE_MIRROR}/v3.7/main" > /etc/apk/repositories;
RUN echo "${ALPINE_MIRROR}/v3.7/community" >> /etc/apk/repositories;
## 设置 node-sass 源 和 安装python
RUN npm config set sass_binary_site https://npm.taobao.org/mirrors/node-sass && \
apk add --update \
python \
python-dev \
py-pip \
&& rm -rf /var/cache/apk/*
这次终于成功地构建了node-python镜像。
然后编写新的项目Dockerfile如下：
FROM node-python
# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
RUN npm install
# If you are building your code for production
# RUN npm install --only=production
# Bundle app source
COPY . .
EXPOSE 7001
CMD [ "npm", "build" ]
CMD [ "npm", "start" ]
再次build项目镜像，没想到还是报错了：
> sleep@5.1.1 install /usr/src/app/node_modules/sleep
> node-gyp rebuild
gyp ERR! build error
gyp ERR! stack Error: not found: make
gyp ERR! stack at getNotFoundError (/usr/lib/node_modules/npm/node_modules/which/which.js:13:12)
gyp ERR! stack at F (/usr/lib/node_modules/npm/node_modules/which/which.js:68:19)
gyp ERR! stack at E (/usr/lib/node_modules/npm/node_modules/which/which.js:80:29)
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/which.js:89:16
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/index.js:42:5
gyp ERR! stack at /usr/lib/node_modules/npm/node_modules/which/node_modules/isexe/mode.js:8:5
gyp ERR! stack at FSReqWrap.oncomplete (fs.js:152:21)
gyp ERR! System Linux 4.9.49-moby
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /usr/src/app/node_modules/sleep
gyp ERR! node -v v8.10.0
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
看来镜像中还缺少C++编译的环境，可以选择安装build-base这个package：
FROM mhart/alpine-node:8
## 设置 node-sass 源 和 安装python以及编译工具
RUN npm config set sass_binary_site https://npm.taobao.org/mirrors/node-sass && \
apk add --update \
python \
python-dev \
py-pip \
build-base \
&& rm -rf /var/cache/apk/*
重新生成node-python镜像。
再次构建项目镜像，OK，完成！
