在 Docker 中永久删除容器
通常，Docker 不会删除已停止的容器，而只会取消标记它们。 发生此过程是为了避免意外删除已停止的容器。
本文将讨论如何正确删除未使用和未标记的容器以回收 Docker 中的资源。
在 Docker 中永久删除容器
在 Docker 中，我们有 remove 命令可以强制删除特定图像。 此命令是用于图像的 docker rmi -f <image_id> 和用于容器的 docker rm <container_id>。
然而，在理论上，该命令不会删除容器镜像，而只会通过取消标记对象来软删除它。
如果我们使用命令 docker image ls -a 检查我们停止的图像，我们可以验证上述命令只会取消标记我们的图像而不是删除它们。
示例输出：
Untagged: my_image:latest
以下部分将讨论多个脚本和参数，以帮助我们永久删除 docker 容器。
在 Docker 中修剪容器
使用 Docker 时，我们可以快速积累许多未使用的对象，这些对象会占用大量磁盘空间并使 Docker 命令生成的输出变得混乱。 不幸的是，除非明确告诉我们这样做，否则 Docker 不会删除未标记和未使用的对象，例如容器、图像、卷和网络。
我们可以通过删除停止状态的容器，通过容器剪枝来快速回收资源。 例如，我们可以使用下面的命令。
示例代码：
docker system prune -a
-a 标志将删除所有未使用的图像。 运行后会提示我们如下信息。
我们可以通过添加带有 -f force 标志的上述命令来绕过此消息。
WARNING! This command will remove the following:
- all containers with the stopped status
- all network paths not used by at least one (1) container
- all images without at least one (1) container associated with them
- all cache
Are you sure you want to continue? [y/N]
此外，上述命令不会删除附加到以前未使用的 Docker 容器的未使用卷。 但是，我们可以附加并使用 --volumes 参数来包括删除未使用的卷。
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