Dockerfile中的命令将如下运行？

docker build Dockerfile .//running it correctly. 

1）我已经在注释中提到每个命令都会按照写法执行，这个Dockerfile是否正确工作？

2.）当我运​​行docker build的时候，这些命令将被用来制作图像

[ec2-user @ ip-xx-xx-xx-xx〜] $ cd / project / p1

[ec2-user @ ip-xx-xx-xx-xx p1] $ ls

Dockerfile abcd

我的Dockerfile由以下命令组成。

Dockerfile

 node 8.1.0 //puls the image from hub RUN mkdir -p /etc/x/y //make directory in the host at path /etc/x/y RUN mkdir /app //make directory in the host at path /app COPY . /app //copy all the files that is WORKDIR /app //cd /app; now the working directory will be /app for next commands ie npm install. RUN npm install EXPOSE 3000 //what this will do? 

Answer 1

问题1：如何运行docker build？

 docker build Dockerfile . # am I running it correctly. 

不，你用docker build .运行它docker build . Dockerfile会自动在当前目录下查找Dockerfile 。 或者你使用docker build -f Path_to_the_docker_file/DockerFile清楚地指定DockerFile的path。

问题2：修复错误并澄清命令

Dockerfile中有一些错误，检查编辑的注释：

 # pulls the image from dockerhub : YES # Needs to be preceeded with FROM FROM node 8.1.0 # all directories are made inside the docker image # make directory in the image at path /etc/x/y : YES RUN mkdir -p /etc/x/y # make directory in the image at path /app : YES RUN mkdir /app COPY . /app # copy all the files that is : YES WORKDIR /app # cd /app; now the working directory will be /app for next commands ie npm install. : YES RUN npm install EXPOSE 3000 # what this will do? => tells all docker instances of this image to listen on port 3000.