这篇文章主要介绍如何利用Dockerfile制作java运行环境的镜像，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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当前用到的环境是：
Centos 7.5
docker-ce 18.06.1-ce
1、先用centos7.5.1804的基础镜像把一些运行需要的环境装好
在/app目录下创建相对应的文件目录
[root@node2 /app/]# mkdir dockerfile/{web/{nginx,tomcat,jdk,apache},system/{centos,ubuntu,redhat}} -pv
[root@node2 /app]# cd dockerfile/system/centos/
[root@node2 /app/dockerfile/system/centos]# mkdir centos-7.5-base
[root@node2 /app/dockerfile/system/centos]# cd centos-7.5-base创建一个Dockerfile文件
[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#vim Dockerfile
#Nginx Base Image
FROM centos:7.5.1804
LABEL maintaier "mr.luo "
RUN yum install -y vim wget pcre pcre-devel zlib zlib-devel openssl openssl-devel iproute net-tools iotop
创建一个用于直接docker build脚本后续直接执行脚本即可
[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#vim build-command.sh
#!/bin/bash
docker build -t 172.20.7.50/baseimages/centos-base:7.5.1804 .
执行脚本创建新镜像
[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#bash build-command.sh
Sending build context to Docker daemon 3.072kB
Step 1/3 : FROM centos:7.5.1804
---> 76d6bc25b8a5
Step 2/3 : LABEL maintaier 'mr.luo@dklwj.com'
---> Using cache
---> 05ccd970d71d
Step 3/3 : RUN yum install -y vim wget pcre pcre-devel zlib zlib-devel openssl openssl-devel iproute net-tools iotop
---> Using cache
---> 73d683a54877
Successfully built 73d683a54877
Successfully tagged 172.20.7.50/baseimages/centos-base:7.5.1804
2、利用制作好的基础环境镜像制作jdk的镜像
从centos-7.5-base退出来在当前目录创建一个jdk1.8的目录.
[root@node2 /app/dockerfile/system/centos/centos-7.5-base]# cd ..
[root@node2 /app/dockerfile/system/centos]# mkdir jdk1.8
[root@node2 /app/dockerfile/system/centos]# cd jdk1.8/
创建Dockerfile
[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim Dockerfile
FROM 172.20.7.50/baseimages/centos-base:7.5.1804
LABEL maintainer "mr.luo "
ADD jdk-8u162-linux-x64.tar.gz /usr/local/src/
RUN ln -s /usr/local/src/jdk1.8.0_162/ /usr/local/jdk
ADD profile /etc/profile
ENV JAVA_HOME /usr/local/jdk
ENV JRE_HOME $JAVA_HOME/jre
ENV CLASSPATH $JAVA_HOME/lib/:$JRE_HOME/lib/
ENV PATH $PATH:$JAVA_HOME/bin
RUN rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
上传jdk包到当前目录下：
复制/etc/profile文件到当前目录
[root@node2 /app/dockerfile/system/centos/jdk1.8]#cp profile /etc/profile
在profile最后添加jdk的环境变量
[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim profile
export JAVA_HOME=/usr/local/jdk
export TOMCAT_HOME=/apps/tomcat
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$TOMCAT_HOME/bin:$PATH
export CLASSPATH=.$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
创建docker build的shell脚本
[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim build-command.sh
#!/bin/bash
#
docker build -t 172.20.7.50/baseimages/centos7.5-jdk:8.162 .
开始制作镜像
[root@node2 /app/dockerfile/system/centos/jdk1.8]#bash build-command.sh
Sending build context to Docker daemon 189.8MB
Step 1/10 : FROM 172.20.7.50/baseimages/centos-base:7.5.1804
---> 73d683a54877
Step 2/10 : LABEL maintainer "mr.luo "
---> Running in 65604dd1f392
Removing intermediate container 65604dd1f392
---> c4720603ce38
Step 3/10 : ADD jdk-8u162-linux-x64.tar.gz /usr/local/src/
---> bc98adffe1b4
Step 4/10 : RUN ln -s /usr/local/src/jdk1.8.0_162/ /usr/local/jdk
---> Running in df5a6f67f9fd
Removing intermediate container df5a6f67f9fd
---> 0ae1af0416c6
Step 5/10 : ADD profile /etc/profile
---> eee23a69c0c8
Step 6/10 : ENV JAVA_HOME /usr/local/jdk
---> Running in edbef8563e83
Removing intermediate container edbef8563e83
---> 5f783f642054
Step 7/10 : ENV JRE_HOME $JAVA_HOME/jre
---> Running in fa0e5f08e732
Removing intermediate container fa0e5f08e732
---> 28a4d31463d4
Step 8/10 : ENV CLASSPATH $JAVA_HOME/lib/:$JRE_HOME/lib/
---> Running in 3c4ebb04ac62
Removing intermediate container 3c4ebb04ac62
---> 245f2dd82d52
Step 9/10 : ENV PATH $PATH:$JAVA_HOME/bin
---> Running in 4f5e6093f0a9
Removing intermediate container 4f5e6093f0a9
---> 5be0e6261eea
Step 10/10 : RUN rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
---> Running in 52d8cb8463a8
Removing intermediate container 52d8cb8463a8
---> 9fb867ae8c39
Successfully built 9fb867ae8c39
Successfully tagged 172.20.7.50/baseimages/centos7.5-jdk:8.162
查看当前目录下的文件
[root@node2 /app/dockerfile/system/centos/jdk1.8]#ls
build-command.sh Dockerfile jdk-8u162-linux-x64.tar.gz profile
检查制作好的镜像是否能正常使用
[root@node2 /app/dockerfile/system/centos/jdk1.8]#docker run -it --rm 172.20.7.50/baseimages/centos7.5-jdk:8.162 bash
[root@919844b164dc /]# java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)
[root@919844b164dc /]# date
Thu Nov 22 21:17:49 CST 2018
[root@919844b164dc /]# exit
exit
3、做Tomcat的镜像
进入之前建好的/app/dockerfile/web/tomcat下,创建一个tomcat-base目录
[root@node2 ~]# cd /app/dockerfile/web/tomcat
[root@node2 /app/dockerfile/web/tomcat]#mkdir tomcat-base
创建Dockerfile
[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#vim Dockerfile
FROM 172.20.7.50/baseimages/centos7.5-jdk:8.162
LABEL maintainer "mr.luo "
RUN mkdir /apps
ADD apache-tomcat-8.5.33.tar.gz /apps
RUN ln -s /apps/apache-tomcat-8.5.33 /apps/tomcat
创建docker build脚本
[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#vim build-command.sh
#!/bin/bash
docker build -t 172.20.7.50/baseimages/centos-tomcat:8.5.33 .
执行创建镜像文件：
[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#bash build-command.sh
Sending build context to Docker daemon 9.625MB
Step 1/5 : FROM 172.20.7.50/baseimages/centos7.5-jdk:8.162
---> 9fb867ae8c39
Step 2/5 : LABEL maintainer "mr.luo "
---> Running in 9ce6fc4d2850
Removing intermediate container 9ce6fc4d2850
---> b68755061b28
Step 3/5 : RUN mkdir /apps
---> Running in b483c6b127f2
Removing intermediate container b483c6b127f2
---> 605c1a048a5f
Step 4/5 : ADD apache-tomcat-8.5.33.tar.gz /apps
---> 3c44f96ed41c
Step 5/5 : RUN ln -s /apps/apache-tomcat-8.5.33 /apps/tomcat
---> Running in 4c1aa39a6c92
Removing intermediate container 4c1aa39a6c92
---> 9b3bc4f58cc9
Successfully built 9b3bc4f58cc9
Successfully tagged 172.20.7.50/baseimages/centos-tomcat:8.5.33
利用创建好的镜像起一个容器检查下是否成功制作好，启动时加上-p暴露端口，在物理机上测试下
[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#docker run -it -p 8802:8080 172.20.7.50/baseimages/centos-tomcat:8.5.33 bash
[root@917b2c2262a3 /]# cd /apps/
[root@917b2c2262a3 apps]# ll
total 0
drwxr-xr-x 9 root root 220 Nov 22 22:08 apache-tomcat-8.5.33
lrwxrwxrwx 1 root root 26 Nov 22 22:08 tomcat -> /apps/apache-tomcat-8.5.33
[root@917b2c2262a3 apps]# ./tomcat/bin/catalina.sh start
Using CATALINA_BASE: /apps/tomcat
Using CATALINA_HOME: /apps/tomcat
Using CATALINA_TMPDIR: /apps/tomcat/temp
Using JRE_HOME: /usr/local/jdk/jre
Using CLASSPATH: /apps/tomcat/bin/bootstrap.jar:/apps/tomcat/bin/tomcat-juli.jar
Tomcat started.
在客户端用浏览器测试
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标题名称：如何利用Dockerfile制作java运行环境的镜像
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