我要评论方法一：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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