docker - Dockerfile中的命令将按以下方式运行吗？

Question

docker build Dockerfile .//running it correctly.

1.)我在注释中提到了每个命令都将按照书面执行，这是Dockerfile的正确工作吗？

2)这些命令将在我运行docker build时用于制作镜像，因此

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

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

Dockerfile a b c d

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 i.e 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，您可以使用 docker build .运行它，而docker会自动在当前目录中查找 Dockerfile。或者，您使用 docker build -f Path_to_the_docker_file/DockerFile，在其中明确指定 DockerFile的路径。

问题2:修正错误并澄清命令

在 Dockerfile 中几乎没有错误，请检查编辑后的注释:

# 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 i.e npm install. : YES

RUN npm install

EXPOSE 3000  # what this will do? => tells all docker instances of this image to listen on port 3000.