Question

我正在尝试从DigitalOcean中的Docker Drop创建一个Docker容器。我正在尝试使用Git克隆来运行Node.js应用程序。我收到错误COPY失败：stat /var/lib/docker/tmp/docker-builder249248811/package.json：没有这样的文件或目录，我不确定为什么。我尝试运行cd，尝试更改WORKdir，尝试更改COPY中的路径。我正在从创建dockerfile的/ root文件夹中运行build命令。

FROM node:12.18.3
 #RUN mkdir /root/live \
  #  cd  /root/live \

RUN  git clone https://username:password@github.com/username/Portfolio.git
WORKDIR .
RUN cd  /Portfolio
COPY  package.json /Portfolio
COPY package-lock.json . /Portfolio
COPY . .
RUN npm install

EXPOSE 8080

CMD ["pm2", "start", "./bin/ww"]

Answer 1

COPY将文件从Docker build上下文（在docker build命令中命名的目录，通常是包含Dockerfile的目录）中复制到映像中。它不会在图像中复制文件。

您通常需要在Docker外部运行此git clone命令。这样做的原因有两个：它使您可以将Dockerfile检入到存储库中；它使您可以根据尚未提交的内容构建映像； Docker层缓存不会阻止您看到源存储库中的更改；您不希望您的GitHub凭据在docker history中以纯文本显示。

我建议使用这个（相当简单的）Dockerfile：

FROM node:12.18.3

# This also creates the directory if it doesn't exist.
# (This frequently is "/app".)
WORKDIR /Portfolio

# We ran `git clone` on the host outside of Docker.
# Copy in only the files we need to install dependencies.
COPY package*.json ./
RUN npm install

# Now copy in the rest of the application.
# (`node_modules` should be included in `.dockerignore`.)
COPY . ./
# RUN npm build

# Standard metadata to start the application.
EXPOSE 8080
CMD ["pm2", "start", "./bin/ww"]
# (Do you actually need a process manager inside a Docker container?)
# CMD ["node", "./bin/ww"]

您在这里遇到的另一个问题是每个RUN命令都在其自己的隔离环境中运行；在每个RUN命令的末尾，对当前工作目录或环境所做的更改都将丢失。您需要使用WORKDIR指令来更改目录，而不是RUN cd ...。

如果您想坚持在Dockerfile中运行git clone，则需要将WORKDIR更改为已签出的内容，但是一旦完成，所有文件都在那里，您可以不需要COPY的任何内容（或RUN cp ...即可在图像中四处移动它们。）

FROM node:12.18.3
WORKDIR /
# Remember, `docker history` will show this line exactly as here,
# including the credentials.
RUN git clone https://username:password@github.com/username/Portfolio.git

# Change directories into what got checked out.
WORKDIR /Portfolio
# All of the files are already there, so we only need to
RUN npm install
EXPOSE 8080
CMD ["pm2", "start", "./bin/ww"]

COPY Failed：尝试在DigitalOcean Droplet上的Docker中复制package.json文件时的统计信息

1 个答案: