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Docker对未使用的对象%28(通常称为“垃圾收集”%29)采取保守的清理方法，例如图像、容器、卷和网络：除非明确要求Docker这样做，否则通常不会删除这些对象。这可能导致Docker使用额外的磁盘空间。对于每种类型的对象，Docker提供了一个prune命令。此外，您还可以使用docker system prune一次清除多种类型的对象。本主题演示如何使用这些prune命令。
剪枝图像
大docker image prune命令允许您清理未使用的图像。默认情况下，docker image prune只清理悬吊图像。悬空图像是没有标记的，也没有被任何容器引用的图像。若要删除悬挂的图像，请执行以下操作：
$ docker image prune WARNING! This will remove all dangling images.Are you sure you want to continue? [y/N] y
若要删除现有容器未使用的所有图像，请使用-a国旗：
$ docker image prune -a WARNING! This will remove all images without at least one container associated to them.Are you sure you want to continue? [y/N] y
默认情况下，将提示您继续。若要绕过提示符，请使用-f或--force旗子。
使用过滤表达式，可以限制哪些图像被剪除。--filter旗子。例如，仅考虑24小时前创建的图像：
$ docker image prune -a --filter "until=24h"
还有其他过滤表达式可用。见docker image prune参照系想要更多的例子。
修剪容器
停止容器时，除非使用--rm旗子。若要查看Docker主机上的所有容器，包括已停止的容器，请使用docker ps -a您可能会惊讶于有多少容器存在，特别是在开发系统%21 A中，停止容器的可写层仍然占用磁盘空间。若要清除此问题，可以使用docker container prune命令。
$ docker container prune WARNING! This will remove all stopped containers.Are you sure you want to continue? [y/N] y
默认情况下，将提示您继续。若要绕过提示符，请使用-f或--force旗子。
默认情况下，所有已停止的容器都将被移除。可以使用--filter旗子。例如，下面的命令只删除已停止的容器，这些容器的时间超过24小时：
$ docker container prune --filter "until=24h"
还有其他过滤表达式可用。见docker container prune参照系想要更多的例子。
修剪量
卷可以由一个或多个容器使用，并占用Docker主机上的空间。卷永远不会自动删除，因为这样做会破坏数据。
$ docker volume prune WARNING! This will remove all volumes not used by at least one container.Are you sure you want to continue? [y/N] y
默认情况下，将提示您继续。若要绕过提示符，请使用-f或--force旗子。
默认情况下，将删除所有未使用的卷。可以使用--filter旗子。例如，下面的命令只删除未使用keep标签：
$ docker volume prune --filter "label!=keep"
还有其他过滤表达式可用。见docker volume prune参照系想要更多的例子。
修剪网络
Docker网络占用的磁盘空间不多，但它们确实创建了iptables规则、桥接网络设备和路由表条目。要清理这些东西，你可以用docker network prune清理没有被任何容器使用的网络。
$ docker network prune WARNING! This will remove all networks not used by at least one container.Are you sure you want to continue? [y/N] y
默认情况下，将提示您继续。若要绕过提示符，请使用-f或--force旗子。
默认情况下，所有未使用的网络都将被删除。可以使用--filter旗子。例如，以下命令只删除24小时以上的网络：
$ docker network prune --filter "until=24h"
还有其他过滤表达式可用。见docker network prune参照系想要更多的例子。
修剪所有东西
大docker system prune命令是修剪图像、容器和网络的快捷方式。在Docker 17.06.0和更早版本中，卷也会被修剪。在Docker 17.06.1及更高版本中，必须指定--volumes旗docker system prune修剪卷。
$ docker system prune WARNING! This will remove: - all stopped containers - all networks not used by at least one container - all dangling images - all build cache Are you sure you want to continue? [y/N] y
如果您使用的是Docker 17.06.1或更高版本，并且希望也修剪卷，请添加--volumes国旗：
$ docker system prune --volumes WARNING! This will remove: - all stopped containers - all networks not used by at least one container - all volumes not used by at least one container - all dangling images - all build cache Are you sure you want to continue? [y/N] y
默认情况下，将提示您继续。若要绕过提示符，请使用-f或--force旗子。