Question

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?

1。）我在评论中提到每个命令都会按照写入的方式执行，这个Dockerfile的工作是否正确？

2.）当我运行docker build时，这些命令将用于制作图像，所以

[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包含以下命令。

Dockerfile

rides = [
  { driver_id: "DR0004", date: "3rd Feb 2016", cost:  5, rider_id: "RD0022", rating: 5 },
  { driver_id: "DR0001", date: "3rd Feb 2016", cost: 10, rider_id: "RD0003", rating: 3 },
  { driver_id: "DR0002", date: "3rd Feb 2016", cost: 25, rider_id: "RD0073", rating: 5 },
  { driver_id: "DR0004", date: "3rd Feb 2016", cost:  5, rider_id: "RD0022", rating: 5 },
]

rides.each_with_object({}) do |ride, h|
  h.update(ride[:driver_id]=>{ rides: 1, earnings: ride[:cost] }) do |_,o,n|
    { rides: o[:rides]+1, earnings: o[:earnings]+n[:earnings] }
  end 
end
  #=> {"DR0004"=>{:rides=>2, :earnings=>10},
  #    "DR0001"=>{:rides=>1, :earnings=>10},
  #    "DR0002"=>{:rides=>1, :earnings=>25}}

Answer 1

问题1：如何运行docker build？

docker build Dockerfile . # am I running it correctly.

不，您使用docker build .运行它，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清楚指定DockerFile的路径。

问题2：修复错误并澄清命令

Dockerfile 中的错误很少，请查看已修改的评论：

# 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.

Dockerfile中的命令运行如下？

1 个答案:

问题1：如何运行docker build？

问题2：修复错误并澄清命令