使用 `docker-compose` 重用容器 [英] Reuse containers with `docker-compose`

问题描述

我有一个应用程序在 docker-compose 定义的多个 Docker 容器上运行.我的用户一切正常，docker-compose ps 输出如下所示:

I've an app running on multiple Docker containers defined by docker-compose. Everything works fine from my user and the docker-compose ps output looks like:

       Name                Command           State     Ports
------------------------------------------------------------
myuser_app_1    /config/bootstrap.sh   Exit 137
myuser_data_1   sh                     Exit 0
myuser_db_1     /run.sh                Exit 143

现在我正在尝试使用 supervisord 运行 docker-compose up(请参阅下面 supervisord.conf 的相关部分)和问题是容器现在被命名为 myapp_app_1、myapp_data_1 和 myapp_db_1，也就是说它们是从头开始创建的，对以前容器的所有自定义都是丢了.

Now I'm trying to run docker-compose up with supervisord (see relevant part of supervisord.conf below) and the issue is that the containers are now named myapp_app_1, myapp_data_1 and myapp_db_1, that is they're created from scratch and all customizations on the former containers is lost.

我尝试重命名容器，但它给出了一个错误，指出已经有一个具有该名称的容器.

I tried renaming the containers, but it gives an error saying that there's already a container with that name.

问:有什么方法可以强制 docker-compose 重用现有容器，而不是根据各自的图像创建新容器?

Q: Is there some way to force docker-compose reuse existing containers instead of creating new ones based in their respective images?

supervisord.conf

supervisord.conf

...
[program:myapp]
command=/usr/local/bin/docker-compose
    -f /usr/local/app/docker-compose.yml up
redirect_stderr=true
stdout_logfile=/var/log/myapp_container.log
stopasgroup=true
user=myuser

推荐答案

Compose 将始终重用容器，只要它们的配置没有改变.

如果容器中有任何状态，则需要将该状态放入卷中.容器应该是短暂的，您应该能够随时销毁它们并重新创建它们而不会丢失任何东西.

If you have any state in a container, you need to put that state into a volume. Containers should be ephemeral, you should be able to destroy them and recreate them at any time without losing anything.

如果您需要初始化某些内容，我会在 Dockerfile 中进行，以便将其保留在映像中.

If you need to initialize something I would do it in the Dockerfile, so that it's preserved in the image.

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