一、构建jdk镜像
1.构建基础镜像centos7
1.做好基础优化，网络工具包，yum源，时间同步
FROM centos:7.6.1810
RUN rm -f /etc/yum.repos.d/*
RUN curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo;
RUN curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo;
RUN yum install net-tools bash-completion supervisor -y \
&& yum clean all \
&& rm -rf /etc/localtime \
&& ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
&& groupadd -g 1000 www \
&& useradd -u 1000 -g 1000 www -M -s /sbin/nologin
2.构建基础镜像
# ll
total 4
-rw-r--r-- 1 root root 468 Aug 27 02:52 Dockerfile
docker build -t centos7_base:7.6.1810 .
2.构建jdk基础镜像
1. 创建目录
mkdir jdk_base
cd jdk_base/
2.创建配置文件
# tail -5 profile
export JAVA_HOME=/opt/jdk
export TOMCAT_HOME=/opt/tomcat
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$TOMCAT_HOME/bin:$PATH
export CLASSPATH=.$CLASSPATH:$JAVA_HOME/bin:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
3.准备好jdk文件
[root@docker-200 /www.yuchaoit.cn/test_dockerfile/tomcat_web/jdk_base]#ll
total 166040
-rw-r--r-- 1 root root 170023183 Jul 14 12:01 jdk-8u181-linux-x64.rpm
4.写Dockerfile，以刚才自建centos镜像为基础了
[root@docker-200 /www.yuchaoit.cn/test_dockerfile/tomcat_web/jdk_base]#cat Dockerfile
FROM centos7_base:7.6.1810
ADD jdk-8u221-linux-x64.tar.gz /opt
ADD profile /etc/profile
RUN ln -s /opt/jdk1.8.0_221 /opt/jdk
ENV JAVA_HOME /opt/jdk
ENV JRE_HOME $JAVA_HOME/jre
ENV CLASSPATH $JAVA_HOME/lib:$JRE_HOME/lib
ENV PATH $PATH:$JAVA_HOME/bin
5.构建镜像
docker build -t centos7_jdk:8u60 .
6.启动jdk容器测试，确保和如下命令结果一样，才是正确配置好了jdk环境变量
[root@docker-200 /www.yuchaoit.cn/test_dockerfile/tomcat_web/jdk_base]#docker run -it --rm centos7_jdk:8u60 java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
