如何在正在运行的 docker 容器中设置环境变量 [英] How to set an environment variable in a running docker container

问题描述

如果我有一个不久前启动的 docker 容器，在该运行的容器中设置环境变量的最佳方法是什么?当我运行 run 命令时，我最初设置了一个环境变量.

If I have a docker container that I started a while back, what is the best way to set an environment variable in that running container? I set an environment variable initially when I ran the run command.

$ docker run --name my-wordpress -e VIRTUAL_HOST=domain.com --link my-mysql:mysql -d spencercooley/wordpress

但是现在它已经运行了一段时间，我想将另一个 VIRTUAL_HOST 添加到环境变量中.我不想删除容器，然后只用我想要的环境变量重新运行它，因为这样我就必须将旧卷迁移到新容器，它有我没有的主题文件和上传想输.

but now that it has been running for a while I want to add another VIRTUAL_HOST to the environment variable. I do not want to delete the container and then just re-run it with the environment variable that I want because then I would have to migrate the old volumes to the new container, it has theme files and uploads in it that I don't want to lose.

我只想更改VIRTUAL_HOST 环境变量的值.

I would just like to change the value of VIRTUAL_HOST environment variable.

推荐答案

一般有两种选择，因为docker现在不支持这个功能:

There are generaly two options, because docker doesn't support this feature now:

1. 创建您自己的脚本，该脚本将作为您的命令的运行器.例如:

1. Create your own script, which will act like runner for your command. For example:

#!/bin/bash
export VAR1=VAL1
export VAR2=VAL2
your_cmd

按照以下方式运行您的命令:

Run your command following way:

docker exec -i CONTAINER_ID /bin/bash -c "export VAR1=VAL1 && export VAR2=VAL2 && your_cmd"

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