从哪里/如何在/ var / www / html中填充文件？ [英] From where/how the files get populated in /var/www/html?

问题描述

我正在学习Docker，并试图理解卷。看一下 wordpress撰写及其 dockerfile 我不知道哪个命令负责填充将wordpress文件放入 / var / www / html 。

I am learning Docker and trying to understand volumes. Looking at this example of wordpress compose and its dockerfile I don't get which command is responsible for populating wordpress files into /var/www/html.

我确实看到dockerfile中有 VOLUME / var / www / html 命令来创建安装点。

I do see that there is VOLUME /var/www/html command in the dockerfile to create a mount point.

有命令下载wordpress文件并将其放在 / usr / src / wordpress 目录中。

There is command to download wordpress files and put in /usr/src/wordpress directory.

但是我没有得到的是文件如何进入 / var / www / html ？

But what I don't get is how does files get into /var/www/html?

是否只是将其挂载到该目录中会导致所有神奇地存储在其中的wordpress文件？

Is it just that mounting to this directory cause all the wordpress files magically stored in this?

是不是在其他地方，码头工人正在这样做？

Is it somewhere else docker is doing this?

编辑：这些WordPress文件在运行 docker-compose up 。我不问如何将文件移动/挂载到 / var / www / html 中。但是问题是，这是怎么回事，参考上面的dockerfile和docker compose文件。

These wordpress files are already moved or copied when ran docker-compose up. I'm not asking how can move/mount files into /var/www/html. But question is how this things happened referring to the dockerfile and docker compose file above.

谢谢

推荐答案

在这种情况下，入口点将复制文件（如果尚不存在）。请注意，在Dockerfile中，已添加wordpress源到/ usr / src / wordpress 。然后，当容器启动时，入口点检查是否存在某些文件，如果不存在，则将wordpress源复制到当前目录中，该目录为 WORKDIR ，即/ var / www / html。

In this case, the entrypoint is copying the files if they don't already exist. Note in the Dockerfile that the wordpress source is added to /usr/src/wordpress. Then, when the container starts, the entrypoint checks if some files exist and if they don't, it copies the wordpress source into the current directory, which is WORKDIR, which is /var/www/html.

使用 / var / www / html 指定为 VOLUME ，从容器的角度来看，将文件放入其中的唯一方法是将带有文件的Docker卷附加到该容器。

With /var/www/html specified as a VOLUME, the only way to get files into there from the container's perspective is to attach a docker volume with files to that. Think of it as a mountpoint.

您可以将本地文件系统附加到该卷：

You can either attach a local filesystem to that volume:

docker run -v /path/to/local/webroot:/var/www/html wordpress

，或者您可以创建一个Docker卷并将其用于持久的，更具Docker风格的对象：

or you can create a docker volume and use it for a persistent, more docker-esque object:

docker volume create webroot

然后使用临时容器将文件移入其中：

And then move the files into it with a transient container:

docker run --rm -v /path/to/local/webroot:/var/www/html \
           -v webroot:/var/www/html2 \
           ubuntu cp -a /var/www/html/ /var/www/html2

此时，您可以将 webroot 作为docker卷，可以附加到任何容器。

at which point you have webroot as a docker volume you can attach to any container.

docker run -v webroot:/var/www/html wordpress

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