从特定步骤重建 docker 映像 [英] rebuild docker image from specific step

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本文介绍了从特定步骤重建 docker 映像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下 Dockerfile.

I have the below Dockerfile. 

FROM ubuntu:14.04
MAINTAINER Samuel Alexander <samuel@alexander.com>

RUN apt-get -y install software-properties-common
RUN apt-get -y update

# Install Java.
RUN echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | debconf-set-selections
RUN add-apt-repository -y ppa:webupd8team/java
RUN apt-get -y update
RUN apt-get install -y oracle-java8-installer
RUN rm -rf /var/lib/apt/lists/*
RUN rm -rf /var/cache/oracle-jdk8-installer

# Define working directory.
WORKDIR /work

# Define commonly used JAVA_HOME variable
ENV JAVA_HOME /usr/lib/jvm/java-8-oracle

# JAVA PATH
ENV PATH /usr/lib/jvm/java-8-oracle/bin:$PATH

# Install maven
RUN apt-get -y update
RUN apt-get -y install maven

# Install Open SSH and git
RUN apt-get -y install openssh-server
RUN apt-get -y install git

# clone Spark
RUN git clone https://github.com/apache/spark.git
WORKDIR /work/spark
RUN mvn -DskipTests clean package

# clone and build zeppelin fork
RUN git clone https://github.com/apache/incubator-zeppelin.git
WORKDIR /work/incubator-zeppelin
RUN mvn clean package -Pspark-1.6 -Phadoop-2.6 -DskipTests

# Install Supervisord
RUN apt-get -y install supervisor
RUN mkdir -p var/log/supervisor

# Configure Supervisord
COPY conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf

# bash
RUN sed -i s#/home/git:/bin/false#/home/git:/bin/bash# /etc/passwd

EXPOSE 8080 8082
CMD ["/usr/bin/supervisord"]

在构建图像时，它在第 23 步失败，即

While building image it failed in step 23 i.e. 

RUN mvn clean package -Pspark-1.6 -Phadoop-2.6 -DskipTests

现在，当我重建时，它从第 23 步开始构建，因为 docker 正在使用缓存.

Now when I rebuild it starts to build from step 23 as docker is using cache.

但如果我想从第 21 步重建图像，即

But if I want to rebuild the image from step 21 i.e. 

RUN git clone https://github.com/apache/incubator-zeppelin.git

我该怎么做?删除缓存的图像是唯一的选择吗?是否有任何额外的参数可以做到这一点?

How can I do that? Is deleting the cached image is the only option? Is there any additional parameter to do that?

推荐答案

你可以在不使用缓存的情况下重建整个东西，方法是:

You can rebuild the entire thing without using the cache by doing a

docker build --no-cache -t user/image-name

要强制从特定行开始重新运行，您可以传递一个未使用的 arg.Docker 将 ARG 值作为环境变量传递给您的 RUN 命令，因此更改 ARG 是对破坏缓存的命令的更改.甚至不需要在 RUN 行自己定义.

To force a rerun starting at a specific line, you can pass an arg that is otherwise unused. Docker passes ARG values as environment variables to your RUN command, so changing an ARG is a change to the command which breaks the cache. It's not even necessary to define it yourself on the RUN line.

FROM ubuntu:14.04
MAINTAINER Samuel Alexander <samuel@alexander.com>

RUN apt-get -y install software-properties-common
RUN apt-get -y update

# Install Java.
RUN echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | debconf-set-selections
RUN add-apt-repository -y ppa:webupd8team/java
RUN apt-get -y update
RUN apt-get install -y oracle-java8-installer
RUN rm -rf /var/lib/apt/lists/*
RUN rm -rf /var/cache/oracle-jdk8-installer

# Define working directory.
WORKDIR /work

# Define commonly used JAVA_HOME variable
ENV JAVA_HOME /usr/lib/jvm/java-8-oracle

# JAVA PATH
ENV PATH /usr/lib/jvm/java-8-oracle/bin:$PATH

# Install maven
RUN apt-get -y update
RUN apt-get -y install maven

# Install Open SSH and git
RUN apt-get -y install openssh-server
RUN apt-get -y install git

# clone Spark
RUN git clone https://github.com/apache/spark.git
WORKDIR /work/spark
RUN mvn -DskipTests clean package

# clone and build zeppelin fork, changing INCUBATOR_VER will break the cache here
ARG INCUBATOR_VER=unknown
RUN git clone https://github.com/apache/incubator-zeppelin.git
WORKDIR /work/incubator-zeppelin
RUN mvn clean package -Pspark-1.6 -Phadoop-2.6 -DskipTests

# Install Supervisord
RUN apt-get -y install supervisor
RUN mkdir -p var/log/supervisor

# Configure Supervisord
COPY conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf

# bash
RUN sed -i s#/home/git:/bin/false#/home/git:/bin/bash# /etc/passwd

EXPOSE 8080 8082
CMD ["/usr/bin/supervisord"]

然后使用唯一的 arg 运行它:

And then just run it with a unique arg:

docker build --build-arg INCUBATOR_VER=20160613.2 -t user/image-name .

要在每次构建时更改参数，您可以将时间戳作为参数传递:

To change the argument with every build, you can pass a timestamp as the arg:

docker build --build-arg INCUBATOR_VER=$(date +%Y%m%d-%H%M%S) -t user/image-name .

或:

docker build --build-arg INCUBATOR_VER=$(date +%s) -t user/image-name .

<小时>

顺便说一句，我建议进行以下更改以使您的层更小，下载和安装后，您可以在单个 RUN 命令上合并清理和删除步骤越多，越小你的最终形象将是.否则，您的图层将包括下载和清理之间的所有中间步骤:

As an aside, I'd recommend the following changes to keep your layers smaller, the more you can merge the cleanup and delete steps on a single RUN command after the download and install, the smaller your final image will be. Otherwise your layers will include all the intermediate steps between the download and cleanup:

FROM ubuntu:14.04
MAINTAINER Samuel Alexander <samuel@alexander.com>

RUN DEBIAN_FRONTEND=noninteractive 
    apt-get -y install software-properties-common && 
    apt-get -y update

# Install Java.
RUN echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | debconf-set-selections && 
    add-apt-repository -y ppa:webupd8team/java && 
    apt-get -y update && 
    DEBIAN_FRONTEND=noninteractive 
    apt-get install -y oracle-java8-installer && 
    apt-get clean && 
    rm -rf /var/lib/apt/lists/* && 
    rm -rf /var/cache/oracle-jdk8-installer && 

# Define working directory.
WORKDIR /work

# Define commonly used JAVA_HOME variable
ENV JAVA_HOME /usr/lib/jvm/java-8-oracle

# JAVA PATH
ENV PATH /usr/lib/jvm/java-8-oracle/bin:$PATH

# Install maven
RUN apt-get -y update && 
    DEBIAN_FRONTEND=noninteractive 
    apt-get -y install 
      maven 
      openssh-server 
      git 
      supervisor && 
    apt-get clean && 
    rm -rf /var/lib/apt/lists/*

# clone Spark
RUN git clone https://github.com/apache/spark.git
WORKDIR /work/spark
RUN mvn -DskipTests clean package

# clone and build zeppelin fork
ARG INCUBATOR_VER=unknown
RUN git clone https://github.com/apache/incubator-zeppelin.git
WORKDIR /work/incubator-zeppelin
RUN mvn clean package -Pspark-1.6 -Phadoop-2.6 -DskipTests

# Configure Supervisord
RUN mkdir -p var/log/supervisor
COPY conf/supervisord.conf /etc/supervisor/conf.d/supervisord.conf

# bash
RUN sed -i s#/home/git:/bin/false#/home/git:/bin/bash# /etc/passwd

EXPOSE 8080 8082
CMD ["/usr/bin/supervisord"]

这篇关于从特定步骤重建 docker 映像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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