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Dockerfile覆盖参数值

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Dockerfile覆盖参数值,docker,arguments,parameter-passing,Docker,Arguments,Parameter Passing,我有一个Dockerfile，其中包含Scala和SBT，如下所示： # Scala and sbt Dockerfile # Scala and SBT forked from: https://github.com/hseeberger/scala-sbt # Adds Docker client installation additionally # Pull base image FROM openjdk:$JAVA_VERSION ARG SCALA_VERSION ARG SB

我有一个Dockerfile，其中包含Scala和SBT，如下所示：

# Scala and sbt Dockerfile
# Scala and SBT forked from: https://github.com/hseeberger/scala-sbt
# Adds Docker client installation additionally

# Pull base image
FROM  openjdk:$JAVA_VERSION

ARG SCALA_VERSION
ARG SBT_VERSION

# Scala expects this file
RUN touch /usr/lib/jvm/java-$JAVA_VERSION-openjdk-amd64/release

# Install Scala
## Piping curl directly in tar
RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion
现在，如果我想使用它作为我的基础图像，我有以下问题：

  • 我是否可以覆盖新Dockerfile中的ARG参数，该文件将使用上面的参数作为基础映像
    • ARG
    值在生成时定义。
    构建基本映像后，您不能仅更改
    --build arg
    以在最终映像中获得另一个
    SCALA\u版本（或者必须在新的Dockerfile中重新安装）
    
当前Dockerfile类似于其他Dockerfile的模板。
    

    您可以使用在构建其他映像时使用此映像作为基本映像来有效地进行安装。
    每个Dockerfile都会生成一个不可变的映像。因此，您需要首先构建一个特定的基本映像，然后从它构建您自己的
    
您可以采取以下方法：
    

    Dockerfile.base
    ：
    

    # Scala and sbt Dockerfile
# Scala and SBT forked from: https://github.com/hseeberger/scala-sbt
# Adds Docker client installation additionally

# Pull base image
ARG JAVA_VERSION
FROM  openjdk:$JAVA_VERSION

ARG SCALA_VERSION
ARG SBT_VERSION

# Scala expects this file
RUN touch /usr/lib/jvm/java-$JAVA_VERSION-openjdk-amd64/release

# Install Scala
## Piping curl directly in tar
RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion

    

    # Scala and sbt Dockerfile
# Scala and SBT forked from: https://github.com/hseeberger/scala-sbt
# Adds Docker client installation additionally

# Pull base image
ONBUILD ARG JAVA_VERSION
FROM  openjdk:$JAVA_VERSION

ONBUILD ARG SCALA_VERSION
ONBUILD ARG SBT_VERSION

# Scala expects this file
ONBUILD RUN touch /usr/lib/jvm/java-$JAVA_VERSION-openjdk-amd64/release

# Install Scala
## Piping curl directly in tar
ONBUILD RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
ONBUILD RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion

    
您的子Dockerfile
    Dockerfile.mine
    ：
    

    ARG JAVA_VERSION
ARG SCALA_VERSION
ARG SBT_VERSION
FROM basejava:java-$JAVA_VERSION-scala-$SCALA_VERSION-sbt-$SBT_VERSION
# Your app stuf here
# ...
# ...

    
构建示例：
    

     export JAVA_VERSION=latest
 export SCALA_VERSION=1.8
 export SBT_VERSION=0.13.9
 docker build . \
   -f Dockerfile.base \
   --build-arg JAVA_VERSION=$JAVA_VERSION \
   --build-arg SCALA_VERSION=$SCALA_VERSION \
   --build-arg SBT_VERSION=$SBT_VERSION \
   -t basejava:java-$JAVA_VERSION-scala-$SCALA_VERSION-sbt-$SBT_VERSION

 docker build . \
   -f Dockerfile.mine \
   --build-arg JAVA_VERSION=latest \
   --build-arg SCALA_VERSION=1.8 \
   --build-arg SBT_VERSION=0.13.9
   -t myjava:java-$JAVA_VERSION-scala-$SCALA_VERSION-sbt-$SBT_VERSION

    

    
方法2，正在构建，zigarn提到
    

    Dockerfile.base
    ：
    

    # Scala and sbt Dockerfile
# Scala and SBT forked from: https://github.com/hseeberger/scala-sbt
# Adds Docker client installation additionally

# Pull base image
ARG JAVA_VERSION
FROM  openjdk:$JAVA_VERSION

ARG SCALA_VERSION
ARG SBT_VERSION

# Scala expects this file
RUN touch /usr/lib/jvm/java-$JAVA_VERSION-openjdk-amd64/release

# Install Scala
## Piping curl directly in tar
RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion

    

    # Scala and sbt Dockerfile
# Scala and SBT forked from: https://github.com/hseeberger/scala-sbt
# Adds Docker client installation additionally

# Pull base image
ONBUILD ARG JAVA_VERSION
FROM  openjdk:$JAVA_VERSION

ONBUILD ARG SCALA_VERSION
ONBUILD ARG SBT_VERSION

# Scala expects this file
ONBUILD RUN touch /usr/lib/jvm/java-$JAVA_VERSION-openjdk-amd64/release

# Install Scala
## Piping curl directly in tar
ONBUILD RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
ONBUILD RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion

    
您的孩子
    Dockerfile.my
    

    FROM basejava
# Base ONLBUILD instructions are automatically inserted here.
# Your app stuf here
# ...
# ...

    
建造：
    

    docker build . -f Dockerfile.base -t basejava

export JAVA_VERSION=latest
export SCALA_VERSION=1.8
export SBT_VERSION=0.13.9
docker build . \
   -f Dockerfile.mine \
   --build-arg JAVA_VERSION=$JAVA_VERSION \
   --build-arg SCALA_VERSION=$SCALA_VERSION \
   --build-arg SBT_VERSION=$SBT_VERSION \
   -t myjava:java-$JAVA_VERSION-scala-$SCALA_VERSION-sbt-$SBT_VERSION

    

    我不能在继承的Dockerfile中重写它吗？是的，你可以。从编辑的Dockerfile生成新图像。是的，将从新Dockerfile生成新图像，但新Dockerfile不会传递这些参数，但会覆盖这些参数。据我所知，这样做似乎是可能的。我要试试看！我添加了有关
    ONBUILD
    指令的信息，该指令可能会帮助您无法更改已生成的映像。您可能会找到一些图像标记约定来解决这个问题。