查看Docker停止容器占用的内存的实现方法小结
作者：MetaverseMan
要查看 Docker 停止的容器占用的内存,可以通过以下几种方法来实现,Docker 提供了一些命令和工具来帮助你管理和监控容器的资源使用情况,需要的朋友可以参考下
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：
docker system df
输出示例：
TYPE TOTAL ACTIVE SIZE RECLAIMABLE Images 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：
docker system prune
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 cache Are you sure you want to continue? [y/N] y Total 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/containers 1.0G /var/lib/docker/image 500M /var/lib/docker/volumes 5.0G /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：
docker inspect abc123
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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