添加shell命令支持

alpine是一个轻量级的linux系统，由于太轻量了，目前被广泛用于docker镜像的制作上了（最新版的docker镜像才5M）。

体积小就有缺点了，缺点就是内部除了基本的命令以外，大部门的功能都不支持，默认连bash都没有。需要自己手动添加并重新构建。

1. 基于alpine:3.8添加bash并设置阿里云源

 

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FROM alpine:3.8   MAINTAINER MaQian   RUN echo "https://mirrors.aliyun.com/alpine/v3.8/main/" > /etc/apk/repositories   RUN apk update \         && apk upgrade \         && apk add --no-cache bash bash-doc bash-completion \         && rm -rf /var/cache/apk/* \         && /bin/bash

2. 基于最新版alpine并设置阿里云源

相比上面的多了一个获取当前版本的逻辑，Dockerfile如下：

 

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from alpine:latest   MAINTAINER MaQian   RUN alpine_version=`cat /etc/issue | head -1 | awk '{print $5}'` \     && echo "https://mirrors.aliyun.com/alpine/v${alpine_version}/main/" > /etc/apk/repositories   \     && apk update && apk upgrade && apk add --no-cache bash bash-doc bash-completion \     && rm -rf /var/cache/apk/*   CMD ["/bin/bash"]

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