How to build a minimized docker image for Hexo

To start with, it is not easy for greenhands to write out an appropriate buildfile for hexo in docker.
As is suggested, Alpine is a minimized Linux environment designated for docker images, which appears to be tiny in size.
Yet it is tough to upgrade node and npm if the pulled version of alpine is outmoded, so take a look when choosing the right origin of the mirror.

The version of localization in China:

FROM daocloud.io/library/alpine:3.6

MAINTAINER CitruXonve, silveritdean@gmail.com

RUN \
    # In China, switch to USTC mirror sources for better efficiancy
    sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories && \
    apk update && apk upgrade && apk add --update wget curl bash nodejs-npm && \
    # Resolve error: could not get uid/gid 'nobody'
    npm config set unsafe-perm true && \
    # In China, use cnpm for better efficiancy
    npm install -g cnpm --registry=https://registry.npm.taobao.org

WORKDIR /root

RUN \
    cnpm install hexo-cli -g && \
    mkdir blog && cd blog && \
    # install hexo
    cnpm install hexo-cli -g && \
    hexo init && cnpm install 

WORKDIR /root/blog/

EXPOSE 4000

CMD ["/usr/bin/hexo", "s"]

Otherwise:

FROM daocloud.io/library/alpine:3.6

MAINTAINER CitruXonve, silveritdean@gmail.com

RUN \
    apk update && apk upgrade && apk add --update wget curl bash nodejs-npm && \
    # Resolve error: could not get uid/gid 'nobody'
    npm config set unsafe-perm true

WORKDIR /root

RUN \
    mkdir blog && cd blog && \
    # install hexo
    npm install hexo-cli -g && \
    hexo init && npm install 

WORKDIR /root/blog/

EXPOSE 4000

CMD ["/usr/bin/hexo", "s"]

docker build -t crxon/alpine-hexo -f hexo-in-docker-alpine .

Run after build:

docker run --name myhexo -p 4000:4000 -v ~/blog:/root/blog -d crxon/alpine-hexo:release

Debug:

docker run --rm --name myhexo -p 4000:4000 -v ~/blog:/root/blog -it crxon/alpine-hexo:debug /bin/bash