dockerfile生产案例-制作自定义tomcat业务镜像

生产案例：制作自定义tomcat业务镜像

基于官方提供的centos、debian、ubuntu、alpine等基础 镜像构建 JDK (Java环 境)，然后再基于自定义的 JDK 镜像构建出业务需要的tomcat 镜像

自定义 Centos 系统基础镜像

先基于官方提供的基础镜像，制作出安装了常用命令的自定义基础镜像

[root@ubuntu1804 ~]#docker pull centos:centos7.7.1908
[root@ubuntu1804 ~]#mkdir -p /data/dockerfile/{web/{nginx,tomcat,jdk},system/{centos,ubuntu,alpine,debian}} 
[root@ubuntu1804 ~]#cd /data/dockerfile/system/centos/ 
[root@ubuntu1804 centos]#vim Dockerfile
[root@ubuntu1804 centos]#cat Dockerfile  
# Centos Base Image 
FROM centos:centos7.7.1908
LABEL maintainer="wangxiaochun <root@wangxiaochun.com>"
RUN yum -y install wget && rm -f /etc/yum.repos.d/* && wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/Centos-7.repo /
    && wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-7.repo /
    && yum -y install  vim-enhanced tcpdump lrzsz tree telnet bash-completion net-tools wget bzip2 lsof  zip unzip nfs-utils gcc make gcc-c++ glibc glibc-devel pcre pcre-devel openssl  openssl-devel systemd-devel zlib-devel /
    && yum clean all /
    && rm -f /etc/localtime  /
    && ln -s ../usr/share/zoneinfo/Asia/Shanghai /etc/localtime
#添加系统账户
RUN  groupadd www -g 2019 && useradd www -u 2019 -g www 

[root@ubuntu1804 centos]#vim build.sh

#通过脚本构建镜像 
[root@ubuntu1804 centos]#cat build.sh  
#!/bin/bash 
docker build -t centos7-base:v1 . 

[root@ubuntu1804 centos]#bash build.sh 
[root@ubuntu1804 centos]#docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos7-base        v1                  34ab3afcd3b3        4 seconds ago       403MB
centos              centos7.7.1908      08d05d1d5859        2 months ago        204MB

构建JDK 镜像

上传JDK压缩包和profile文件上传到Dockerfile当前目录

#将CentOS7主机上的/etc/profile文件传到 Dockerfile 所在目录下
[root@ubuntu1804 ~]#scp centos7:/etc/profile 10.0.0.100:/data/dockerfile/web/jdk

#修改profile文件，加下面四行相关变量
[root@ubuntu1804 ~]#vim /data/dockerfile/web/jdk/profile
[root@ubuntu1804 ~]#tail -n 5 /data/dockerfile/web/jdk/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

#下载jdk文件传到Dockfile目录下
#https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
[root@ubuntu1804 ~]#tree /data/dockerfile/web/jdk
/data/dockerfile/web/jdk
├── jdk-8u212-linux-x64.tar.gz
└── profile

0 directories, 2 files

准备Dockerfile文件

[root@ubuntu1804 ~]#vim  /data/dockerfile/web/jdk/Dockerfile 
[root@ubuntu1804 ~]#cat /data/dockerfile/web/jdk/Dockerfile
#JDK Base Image
FROM centos7-base:v1
LABEL maintainer="wangxiaochun <root@wangxiaochun.com>"
ADD jdk-8u212-linux-x64.tar.gz /usr/local/src/
RUN ln -s /usr/local/src/jdk1.8.0_212 /usr/local/jdk
ADD profile /etc/profile
ENV JAVA_HOME /usr/local/jdk
ENV JRE_HOME JAVA_HOME/jre
ENV CLASSPATHJAVA_HOME/lib/:JRE_HOME/lib/
ENV PATHPATH:$JAVA_HOME/bin

执行构建脚本制作镜像

[root@ubuntu1804 ~]#vim /data/dockerfile/web/jdk/build.sh
[root@ubuntu1804 ~]#cat /data/dockerfile/web/jdk/build.sh
#!/bin/bash
docker build -t centos7-jdk:8u212 .

[root@ubuntu1804 ~]#tree /data/dockerfile/web/jdk/
/data/dockerfile/web/jdk/
├── build.sh
├── Dockerfile
├── jdk-8u212-linux-x64.tar.gz
└── profile

0 directories, 4 files
[root@ubuntu1804 ~]#cd /data/dockerfile/web/jdk/
[root@ubuntu1804 jdk]#bash build.sh
[root@ubuntu1804 jdk]#docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos7-jdk         8u212               fdbeb8a49ea6        59 seconds ago      809MB
centos7-base        v1                  34ab3afcd3b3        44 minutes ago      403MB
centos              centos7.7.1908      08d05d1d5859        2 months ago        204MB

从镜像启动容器测试

[root@ubuntu1804 jdk]#docker run -it --rm centos7-jdk:8u212 bash
[root@25c9c0266bd2 /]# java -version
java version "1.8.0_212"
Java(TM) SE Runtime Environment (build 1.8.0_212-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.212-b10, mixed mode)

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