Docker Java program mirroring
Production steps
# 创建镜像制作目录
mkdir docker
cd docker
# 将oracle的jre包和生成好的程序jar放到目录中
# 为了制造较小体积的镜像，不使用jdk包，也没有必要使用它
cp .../jre-8u221-linux-x64.tar.gz ./
cp .../seckill-1.0-SNAPSHOT.jar ./
# 创建并编辑编辑Dockfile镜像生成文件
vim Dockerfile
# 将下面的内容写入文件中，详细的东西在后面会有说明
FROM docker.io/jeanblanchard/alpine-glibc
ADD jre-8u221-linux-x64.tar.gz /usr/java/jdk
ENV JAVA_HOME /usr/java/jdk/jre1.8.0_221
ENV PATH ${PATH}:${JAVA_HOME}/bin
COPY seckill-1.0-SNAPSHOT.jar /home/seckill-1.0-SNAPSHOT.jar
CMD java -jar /home/seckill-1.0-SNAPSHOT.jar
# 生成名称为seckill，版本为v0的镜像
docker build -t seckill:v0 .
# 运行镜像，我的Java程序是监听在8080端口的，所以将镜像容器的8080端口映射到宿主机的8080，并命名容器的名称为seckill
docker run --name seckill -p 8080:8080 seckill
# 查看当前seckill容器的输出，这里会打印显示Java的控制台输出内容
docker logs seckillHere to explain the contents Dockfile file:
- FROM docker.io/jeanblanchard/alpine-glibc:docker of linux mirror There are many, such as Ubuntu, centos and the like, but their volume was relatively large, is simply a mirror of more than 400M, of which only a mirror of alpine less than 10M, very compact, so here it is chosen as the basis for the construction of a mirror. But alpine is based MUSL libs (mini libc), and Java-based GUN Standard C (glibc) library, and if no treatment, then Java will not run on it, but the Internet has already made big brother of glibc installed alpine mirror, we can directly use
- ADD jre-8u221-linux-x64.tar.gz / usr / java / jdk: jre decompressed and compressed to add / usr / java / jdk directory
- ENV JAVA_HOME /usr/java/jdk/jre1.8.0_221,ENV PATH $ {PATH}: $ {JAVA_HOME} / bin: This Java environment variables, where a stepped pit, to be noted that JAVA_HOME path setting, if your version of jre package and I are not the same, then, need to be modified, unzip my post here is jre1.8.0_221
- COPY seckill-1.0-SNAPSHOT.jar /home/seckill-1.0-SNAPSHOT.jar: Copy add Java to the specified directory
- CMD java -jar /home/seckill-1.0-SNAPSHOT.jar: Set to start the Java program to run after the container
If docker not quite understand, you can see below me the process of making reference links