php 如何通过docker容器中的Dockerfile覆盖文件？
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How can I overwrite a file through Dockerfile in docker container?
提问by Ciro Caiazzo
I have to overwrite a file through Dockerfile. In particular on an Ubuntu container with Apache and PHP and I have to overwrite the file php5-cgi.conf. I tried to use the following command:
我必须通过 Dockerfile 覆盖一个文件。特别是在带有 Apache 和 PHP 的 Ubuntu 容器上，我必须覆盖文件 php5-cgi.conf。我尝试使用以下命令：
COPY php5-cgi.conf /etc/apache2/conf-enabled/php5-cgi.conf
but I had the error: File already exists
但我有错误： File already exists
I have also tried to use the following command
我也尝试使用以下命令
RUN cp -f php5-cgi.conf /etc/apache2/conf-enabled/
RUN cp -f php5-cgi.conf /etc/apache2/conf-enabled/
but the file is not copied when the container is running, Is there any advice on this?
但是在容器运行时不会复制文件，对此有什么建议吗？
回答by Jay Blanchard
Drop the file name from the destination:
从目的地删除文件名：
COPY php5-cgi.conf /etc/apache2/conf-enabled/
The destination is an absolute path(not filename), or a path relative to the work directory, into which the source will be copied inside the destination container.
目标是绝对路径（不是文件名），或相对于工作目录的路径，源将在目标容器内复制到该路径中。
回答by Farhad Farahi
I just tested following docker file with no problem.
我刚刚测试了以下 docker 文件，没有问题。
from debian:jessie
COPY debian_version /etc/debian_version
As PolarisUser stated in comments, you need to put debian_versionin the same folder as dockerfileor use absolute path.
Another way would be mounting the file when running the container.
作为PolarisUser在注释中规定，你需要把debian_version在同一文件夹dockerfile或使用absolute path。另一种方法是在运行容器时挂载文件。
docker run -d -v php5-cgi.conf:/etc/apache2/conf-enabled/php5-cgi.conf --name your_container_name <imagename:tag> <startup command>
回答by Volleyball Player
docker cp "yourfilename" "containername":/destination
Below is a working example:
下面是一个工作示例：
docker cp config.json bigdataapp:/app/src/bigdatapp/wwwroot/assets/config/config.json
