学习docker(2)-基于jdk1.8 的docker 镜像

1.宿主机上，创建dockerfile文件

# CentOS with JDK 8
# centos作为基础镜像
FROM centos

# 维护者
MAINTAINER  zsw

# 创建目录
RUN mkdir  /usr/local/java

# 宿主机上的jdk 压缩包路径   自动解压至容器内的指定安装位置
#例如你想解压至 /usr/local/java/
#  ADD jdk-8u171-linux-x64.tar.gz /usr/local/java8/  实际解压至/usr/local/java/jdk1.8.0_171
#  jdk-8u171-linux-x64.tar.gz 对应的解压目录文件夹是jdk1.8.0_171
ADD /xxx/xxx/jdk-8u171-linux-x64.tar.gz /usr/local/java/


# 设置环境变量
ENV JAVA_HOME /usr/local/java/jdk1.8.0_171
ENV JRE_HOME ${JAVA_HOME}/jre
ENV CLASSPATH .:${JAVA_HOME}/lib:${JRE_HOME}/lib
ENV PATH ${JAVA_HOME}/bin:$PATH

2.构建镜像

2.1 执行命令

# 参数 -f /xxx/.../dockerfile  指定dockerfile文件的位置 
# 参数 -t centos-jdk8  定义一个镜像名称
# 不要忘记最后面的点  .
docker build -f /xxx/.../dockerfile -t centos-jdk8 .

# 如果执行命令  在dockerfile文件统计目录下，可不用指定dokerfile指定位置
docker build -t centos-jdk8 .

2.2 执行过程

[root@localhost mydocker]# docker build -t centos-java8 .
Sending build context to Docker daemon  190.9MB
Step 1/9 : FROM centos
 ---> 0f3e07c0138f
Step 2/9 : MAINTAINER  zsw
 ---> Running in b00ec8a87148
Removing intermediate container b00ec8a87148
 ---> 3439a1639c25
Step 3/9 : RUN mkdir  /usr/local/java
 ---> Running in eb63a19f93c6
Removing intermediate container eb63a19f93c6
 ---> 52b1463a6a25
Step 4/9 : ADD jdk-8u171-linux-x64.tar.gz /usr/local/java/
 ---> eeda7b44dcb3
Step 5/9 : ENV JAVA_HOME /usr/local/java/jdk1.8.0_171
 ---> Running in eb54fbd91445
Removing intermediate container eb54fbd91445
 ---> a0feb140a671
Step 6/9 : ENV JRE_HOME ${JAVA_HOME}/jre
 ---> Running in 25f717738527
Removing intermediate container 25f717738527
 ---> d9d409bb28e0
Step 7/9 : ENV CLASSPATH .:${JAVA_HOME}/lib:${JRE_HOME}/lib
 ---> Running in c6c9db791fca
Removing intermediate container c6c9db791fca
 ---> 139d8a76aca7
Step 8/9 : ENV PATH ${JAVA_HOME}/bin:$PATH
 ---> Running in f97dab631e5f
Removing intermediate container f97dab631e5f
 ---> 5723b43356c8
Step 9/9 : CMD /bin/bash -c 'java -version'
 ---> Running in d77b947a1bb2
Removing intermediate container d77b947a1bb2
 ---> 098ccd8b0f7d
Successfully built 098ccd8b0f7d
Successfully tagged centos-java8:latest

2.3 查看镜像

[root@localhost mydocker]# docker images
REPOSITORY     TAG    IMAGE ID            CREATED             SIZE
centos-java8  latest  098ccd8b0f7d        11 seconds ago      607MB

3 运行容器

# 参数 -d  后台启动
# 后缀 /bin/sh 开启一个进程，保持容器的运行，否则容器运行一下就停止了
#创建并进入
docker run -it --name="zsw-tester" centos-java8 /bin/sh

#查看java 版本 是否安装成功
[root@67f129665b01 /]# java -version
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

# 查看环境变量
[root@67f129665b01 /]# env
LANG=en_US.UTF-8
HOSTNAME=67f129665b01
JAVA_HOME=/usr/local/java/jdk1.8.0_171
CLASSPATH=.:/usr/local/java/jdk1.8.0_171/lib:/usr/local/java/jdk1.8.0_171/jre/lib
PWD=/
HOME=/root
TERM=xterm
SHLVL=1
JRE_HOME=/usr/local/java/jdk1.8.0_171/jre
PATH=/usr/local/java/jdk1.8.0_171/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
LESSOPEN=||/usr/bin/lesspipe.sh %s
_=/usr/bin/env