docker 构建jdk 镜像

1. 下载jdk 

jdk-8u251-linux-x64.tar.gz

2. 创建一个Dockerfile

touch Dockerfile

3. 编写Dockerfile

FROM centos:7
RUN cat /etc/redhat-release
COPY jdk-8u251-linux-x64.tar.gz /opt/jdk/
RUN tar -zxf /opt/jdk/jdk-8u251-linux-x64.tar.gz -C /opt/jdk/ && rm -rf /opt/jdk/jdk-8u251-linux-x64.tar.gz
ENV JAVA_HOME=/opt/jdk/jdk1.8.0_251/
ENV PATH=$PATH:$JAVA_HOME/bin
RUN java -version

4. 构建镜像 

 docker build -t jdk8:1 .

5. 查看镜像

docker image list