Dockfile 生成docker鏡像文件大小的比較

下面就是我針對docker file同一個文件，按照layer層的個數的多少，分別構建了兩個鏡像的jenkins-master。兩者大小相差300MB。

 

<1> layer層數太多，沒有將命令合並為一條命令

FROM jenkins/jenkins:2.194
MAINTAINER [e-mail]
USER root

ENV MAVEN_HOME /usr/local/maven
ENV JAVA_HOME  /usr/local/java
ENV M2=/usr/local/maven/repository
ENV CLASSPATH .:$JAVA_HOME/lib:$M2_HOME/lib
ENV PATH $MAVEN_HOME/bin:$JAVA_HOME/bin:$PATH

RUN mkdir -p /usr/local/java
RUN mkdir -p /usr/local/maven/repository

COPY soft/apache-maven-3.5.4/*   /usr/local/
COPY soft/jre1.8.0_212/*   /usr/local/java/

 

<2> layer層數很少，將全部命令合並為一條命令

FROM jenkins/jenkins:2.194
MAINTAINER [e-mail]

USER root && \
ENV MAVEN_HOME /usr/local/maven && \
ENV JAVA_HOME  /usr/local/java && \
ENV M2 /usr/local/maven/repository && \
ENV CLASSPATH .:$JAVA_HOME/lib:$M2_HOME/lib && \
ENV PATH $MAVEN_HOME/bin:$JAVA_HOME/bin:$PATH && \

RUN mkdir -p /usr/local/java && \
RUN mkdir -p /usr/local/maven/repository && \

COPY soft/apache-maven-3.5.4/*   /usr/local/ && \
COPY soft/jre1.8.0_212/*   /usr/local/java/

 

然后，分別執行構建命令

root >> cd /opt/dockerfile/jenkins/02/

root >> docker build -f /opt/dockerfile/jenkins/02/jenkins-master-01.Dockerfile . -t registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194

root >> docker build -f /opt/dockerfile/jenkins/02/jenkins-master-02.Dockerfile . -t registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194-test

 

 

 

 

最后，我們檢查結果

發現第二個dockerfile生成的鏡像文件大小要比前者體積小300MB。

root >> docker images

 

 

 

附錄：

如果需要，我們還可以將生成好的jenkins-master提交到阿里雲的倉庫，命令參考如下

root >> docker login --username=kevin@1522315893340281 registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master

root >> docker tag db8450d6f4f0 registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194

root >> docker push registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194

 

上傳完畢后，登錄阿里雲倉庫，查看鏡像版本，如下

 

參考資料

https://www.cnblogs.com/ericnie/p/7991218.html