Dockfile 生成Docker镜像文件大小的比较-演道网

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div id=”content”>下面就是我针对docker file同一个文件，按照layer层的个数的多少，分别构建了两个镜像的jenkins-master。两者大小相差300MB。

layer层数太多，没有将命令合并为一条命令

FROM jenkins/jenkins:2.194
MAINTAINER tiandong9860806@linuxidc.com
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/

layer层数很少，将全部命令合并为一条命令

FROM jenkins/jenkins:2.194
MAINTAINER tiandong9860806@linuxidc.com
 
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，分别执行构建命令

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，我们检查结果

发现第二个dockerfile生成的镜像文件大小要比前者体积小300MB。

root >> docker images

附录：

如果需要，我们还可以将生成好的jenkins-master提交到阿里云的仓库，命令参考如下

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

上传完毕后，登录阿里云仓库Ｏdiv>

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