使用空镜像scratch构建镜像

• 1.使用空镜像scratch构建镜像

• 操作步骤如下：
  1）.获取空镜像scratch #必须优先安装docker
  docker search scratch
  2）.新建一个文件夹，用wget下载rootfs.tar.xz压缩包和nginx配置

     wget -O rootfs.tar.xz https://github.com/debuerreotype/docker-debian-artifacts/raw/b024a792c752a5c6ccc422152ab0fd7197ae8860/jessie/rootfs.tar.xz
     wget -O nginx.conf https://github.diablo.corp/raw/slvi/docker-k8s-training/master/docker/res/nginx.conf

• 2.创建Dockerfile文件

新建一个dockerfile文件，将下列内容粘贴进去：

#引入一个空镜像
FROM scratch   

# set the environment to honour SAP's proxy servers
ENV http_proxy http://sap.corp:8080
ENV https_proxy http://sap.corp:8080
ENV no_proxy .sap.corp

# give yourself some credit
LABEL maintainer="Jerry Wang"

# add and unpack an archive that contains a Debian root filesystem
ADD rootfs.tar.xz /

# use the apt-get package manager to install nginx and wget
RUN apt-get update && 
apt-get -y install nginx wget

# use wget to download a custom website into the image
RUN wget --no-check-certificate -O /usr/share/nginx/html/cheers.jpg https://github.diablo.corp/raw/slvi/docker-k8s-training/master/docker/res/cheers.jpg && 
wget --no-check-certificate -O /usr/share/nginx/html/index.html https://github.diablo.corp/raw/slvi/docker-k8s-training/master/docker/res/cheers.html

# copy the custom nginx configuration into the image
COPY nginx.conf /etc/nginx/nginx.conf

# link nginx log files to Docker log collection facility
RUN ln -sf /dev/stdout /var/log/nginx/access.log && 
ln -sf /dev/stderr /var/log/nginx/error.log

# expose port 80 - the standard port for webservers
EXPOSE 80

# and make sure that nginx runs when a container is created
CMD ["nginx", "-g", "daemon off;"]

• 3.执行命令，构建镜像 

执行命令进行镜像的构建：

 docker build -t nginx-from-scratch1.0 .

运行docker镜像，启动服务
 docker run -d -p 1083:80 nginx-from-scratch:1.0 

 浏览器访问：http://localhost:1083