使用 Dockerfile 构建 docker 映像时出错

Question

我正在尝试使用Dockerfile 中的配置构建 docker 映像：

FROM ubuntu
MAINTAINER axiom88guru(axiom88guru@gmail.com)
Configuration for app below.
Run upgrades

RUN apt-get update
Install basic packages

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
Install Ruby

RUN apt-get -qq -y install ruby-full
RUN gem install bundler --no-ri --no-rdoc
RUN gem install foreman
Install rails-new-docker

WORKDIR /app
RUN git clone https://github.com/axiom88-guru/rails-docker.git /app
RUN bundle install --without development test
Run rails-new-docker

ENV SECRET_KEY_BASE dockerkeybase
ENV RAILS_ENV production
EXPOSE 5959
CMD foreman start -f Procfile

当我在 bash 中运行这些命令时，它们按预期工作，但在 docker build 期间却没有：

Removing intermediate container 344e99851852
Step 8/14 : WORKDIR /app
—> 3c204a395f23
Removing intermediate container 680b1841a3fc
Step 9/14 : RUN git clone https://github.com/axiom88-guru/rails-docker.git /app
—> Running in d7a9de9f6ab5
/bin/sh: 1: git: not found
The command ‘/bin/sh -c git clone https://github.com/axiom88-guru/rails-docker.git /app’ returned a non-zero code: 127

谁能帮我找出解决办法吗？

Answer 1

需要安装 git，因为基本的 ubuntu 映像仅提供最小的已安装包集（这样做是为了保持映像大小较小）。

FROM ubuntu
MAINTAINER axiom88guru(axiom88guru@gmail.com)
# Configuration for app below.
# Run upgrades

RUN apt-get update
# Install basic packages

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs git
# Install Ruby

RUN apt-get -qq -y install ruby-full
RUN gem install bundler --no-ri --no-rdoc
RUN gem install foreman
# Install rails-new-docker

WORKDIR /app
RUN git clone https://github.com/axiom88-guru/rails-docker.git /app
RUN bundle install --without development test
# Run rails-new-docker

ENV SECRET_KEY_BASE dockerkeybase
ENV RAILS_ENV production
EXPOSE 5959
CMD foreman start -f Procfile

这个版本应该可以工作。我刚刚将git 添加到第一个apt-get install 步骤中。