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DockerFile案例
案例1：自定义镜像mycentos
1、在Centos7宿主机上启用ip转发功能
# Avoid WARNING: IPv4 forwarding is disabled. Networking will not work. echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf systemctl restart network 2、编写DockerFile文件：vim Dockerfile
# 查询centos镜像版本：https://hub.docker.com/ FROM centos:7 # author<email> MAINTAINER auth<[email protected]> ENV MYPATH /usr/local WORKDIR $MYPATH RUN yum -y install vim RUN yum -y install net-tools # 暴露端口 EXPOSE 80 CMD echo $MYPATH CMD /bin/bash 3、构建mycentos镜像（不要忘记最后的.）
docker build -f Dockerfile -t mycentos:1.0 . 4、通过mycentos镜像生成容器，并且更改容器的yum源
# 创建并运行容器 docker run -it --name mycentos01 mycentos:1.0 # yum repo (163) mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo yum clean all && yum makecache # ping test ping www.baidu.com 案例2：带有JDK的Centos7镜像
1、下载JDK到宿主机工作目录（如jdk-8u281-linux-x64.tar.gz）
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在linux中安装jdk的教程（若不需要在宿主机上安装jdk，可以跳过）
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Java官方文档：https://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html
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Change directory to the location where you would like the JDK to be installed, then move the .tar.gz archive file to the current directory.
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Unpack the archive file and install the JDK. ( tar zxvf jdk-8uversion-linux-x64.tar.gz )
tar zxvf jdk-8u281-linux-x64.tar.gz -
The JDK files are installed in a directory called jdk1.8.0_version in the current directory.
jdk1.8.0_281 -
Delete the .tar.gz file if you want to save disk space.
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2、编写DockerFile文件：vim Dockerfile1
FROM centos:7 MAINTAINER auth<[email protected]> ENV MYPATH /usr/local WORKDIR $MYPATH RUN yum -y install vim RUN yum -y install net-tools # COPY:将宿主机中指定的文件复制到docker容器中指定的路径 ADD:复制（若是压缩文件会先解压） ADD jdk-8u281-linux-x64.tar.gz /usr/local ENV JAVA_HOME /usr/local/jdk1.8.0_281 ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar ENV PATH $PATH:$JAVA_HOME/bin EXPOSE 80 CMD echo $MYPATH CMD /bin/bash 3、构建 jdk+centos7 镜像（不要忘记最后的.）
docker build -f Dockerfile1 -t mycentos:2.0 . 
