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方法一：使用 docker system df 命令docker system df 命令可以显示 Docker 使用的磁盘空间，包括镜像、容器和数据卷的占用情况。
运行命令： 输出示例： TYPE TOTAL ACTIVE SIZE RECLAIMABLEImages 10 5 5.00GB 2.50GB (50%)Containers 20 10 1.00GB 500MB (50%)Local Volumes 5 3 500MB 200MB (40%)Build Cache 0 0 0B 0B
方法二：使用 docker inspect 命令docker inspect 命令可以查看容器的详细信息，包括其状态和资源使用情况。
获取所有停止的容器的 ID： docker ps -a -q --filter status=exited 查看某个停止的容器的详细信息： docker inspect <container_id> 解析输出： 在输出的 JSON 中，查找 SizeRw 和 SizeRootFs 字段，这些字段分别表示容器的可写层大小和根文件系统的总大小。
方法三：使用 docker system prune 命令虽然 docker system prune 命令主要用于清理未使用的资源，但它也可以帮助你了解哪些资源可以被回收。 运行命令： 输出示例： WARNING! This will remove: - all stopped containers - all networks not used by at least one container - all dangling images - all build cacheAre you sure you want to continue? [y/N] yTotal reclaimed space: 2.50GB
方法四：使用 du 命令你也可以直接在宿主机上使用 du 命令来查看 Docker 目录的磁盘使用情况。 查找 Docker 存储目录： 默认情况下，Docker 存储目录位于 /var/lib/docker。 运行 du 命令： sudo du -h --max-depth=1 /var/lib/docker 输出示例： 4.0K /var/lib/docker/containers1.0G /var/lib/docker/image500M /var/lib/docker/volumes5.0G /var/lib/docker
综合示例假设你有一个停止的容器 ID 为 abc123，你可以按照以下步骤查看其占用的内存： 获取容器的详细信息： 解析输出： 在输出的 JSON 中，查找 SizeRw 和 SizeRootFs 字段： { "Id": "abc123", "Created": "2023-10-01T12:34:56.789Z", "Path": "/bin/bash", "Args": [], "State": { "Status": "exited", "Running": false, "Paused": false, "Restarting": false, "OOMKilled": false, "Dead": false, "Pid": 0, "ExitCode": 0, "Error": "", "StartedAt": "2023-10-01T12:34:56.789Z", "FinishedAt": "2023-10-01T12:35:00.789Z" }, "Image": "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef", "ResolvConfPath": "/var/lib/docker/containers/abc123/resolv.conf", "HostnamePath": "/var/lib/docker/containers/abc123/hostname", "HostsPath": "/var/lib/docker/containers/abc123/hosts", "LogPath": "/var/lib/docker/containers/abc123/abc123-json.log", "Name": "/my_container", "RestartCount": 0, "Driver": "overlay2", "Platform": "linux", "MountLabel": "", "ProcessLabel": "", "AppArmorProfile": "", "ExecIDs": null, "HostConfig": { "Binds": null, "ContainerIDFile": "", "LogConfig": { "Type": "json-file", "Config": {} }, "NetworkMode": "default", "PortBindings": {}, "RestartPolicy": { "Name": "no", "MaximumRetryCount": 0 }, "AutoRemove": false, "VolumeDriver": "", "VolumesFrom": null, "CapAdd": null, "CapDrop": null, "CgroupnsMode": "host", "Dns": [], "DnsOptions": [], "DnsSearch": [], "ExtraHosts": null, "GroupAdd": null, "IpcMode": "private", "Cgroup": "", "Links": null, "OomScoreAdj": 0, "PidMode": "", "Privileged": false, "PublishAllPorts": false, "ReadonlyRootfs": false, "SecurityOpt": null, "UTSMode": "", "UsernsMode": "", "ShmSize": 67108864, "Runtime": "runc", "ConsoleSize": [ 0, 0 ], "Isolation": "", "CpuShares": 0, "Memory": 0, "NanoCpus": 0, "CgroupParent": "", "BlkioWeight": 0, "BlkioWeightDevice": [], "BlkioDeviceReadBps": null, "BlkioDeviceWriteBps": null, "BlkioDeviceReadIOps": null, "BlkioDeviceWriteIOps": null, "CpuPeriod": 0, "CpuQuota": 0, "CpuRealtimePeriod": 0, "CpuRealtimeRuntime": 0, "CpusetCpus": "", "CpusetMems": "", "Devices": [], "DeviceCgroupRules": null, "DeviceRequests": null, "KernelMemory": 0, "KernelMemoryTCP": 0, "MemoryReservation": 0, "MemorySwap": 0, "MemorySwappiness": null, "OomKillDisable": false, "PidsLimit": null, "Ulimits": null, "CpuCount": 0, "CpuUsage": 0, "IOMaximumIOps": 0, "IOMaximumBandwidth": 0, "MaskedPaths": [ "/proc/asound", "/proc/acpi", "/proc/kcore", "/proc/keys", "/proc/latency_stats", "..." ], "ReadonlyPaths": [ "/proc/bus", "/proc/fs", "/proc/irq", "/proc/sys", "/proc/sysrq-trigger", "..." ] }, "GraphDriver": { "Data": { "LowerDir": "/var/lib/docker/overlay2/fc1234567890abcdef1234567890abcdef/diff", "MergedDir": "/var/lib/docker/overlay2/abc123/merged", "UpperDir": "/var/lib/docker/overlay2/abc123/diff", "WorkDir": "/var/lib/docker/overlay2/abc123/work" }, "Name": "overlay2" }, "Mounts": [], "Config": { "Hostname": "abc123", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ], "Cmd": [ "/bin/bash" ], "Image": "ubuntu:latest", "Volumes": null, "WorkingDir": "/", "Entrypoint": null, "OnBuild": null, "Labels": {} }, "NetworkSettings": { "Bridge": "", "SandboxID": "1234567890abcdef1234567890abcdef", "HairpinMode": false, "LinkLocalIPv6Address": "", "LinkLocalIPv6PrefixLen": 0, "Ports": {}, "SandboxKey": "/var/run/docker/netns/1234567890ab", "SecondaryIPAddresses": null, "SecondaryIPv6Addresses": null, "EndpointID": "", "Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "IPAddress": "", "IPPrefixLen": 0, "IPv6Gateway": "", "MacAddress": "", "Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "1234567890abcdef1234567890abcdef", "EndpointID": "", "Gateway": "", "IPAddress": "", "IPPrefixLen": 0, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "", "DriverOpts": null } } }, "SizeRw": 10485760, # 可写层大小（10 MB） "SizeRootFs": 209715200 # 根文件系统总大小（200 MB）}
总结通过上述方法，你可以详细了解停止的 Docker 容器占用的内存和其他资源。
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