debian 里的 docker 显示满了，但其实没占多少，高手帮下忙

[nbweb]

debian 11 系统，30G 的系统空间，安装了 docker ，显示占满了，但实际没有满。

用 df 查看，overlay2 占满了 29G 的空间

root@debian:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            2.0G     0  2.0G   0% /dev
tmpfs           394M  2.5M  391M   1% /run
/dev/sda1        29G   29G     0 100% /
tmpfs           2.0G     0  2.0G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/md1         26T   17T  8.0T  68% /mnt/Public
tmpfs           394M     0  394M   0% /run/user/0
overlay          29G   29G     0 100% /var/lib/docker/overlay2/53cab8791c08e97ba594e604c7a39abf6958b0d94611ef017729e7a69f6a750a/merged
overlay          29G   29G     0 100% /var/lib/docker/overlay2/f338e2feb5125d730b106eaa7d3760ed41a8a2b7a9712e3386668d2feba3ed67/merged
overlay          29G   29G     0 100% /var/lib/docker/overlay2/fb36ca008cec29247d60c476cf7516ee251a1eac9c3cdd84807fc2ab33ab1217/merged
overlay          29G   29G     0 100% /var/lib/docker/overlay2/ad36b711af0ed9f0fc42c6e02b43846883b8da88289d2a236945122f552fd8de/merged

/var 空间其实只占了 4.5G

root@debian:~# du -sh /var
4.5G    /var

/usr 空间

root@debian:~# du -sh /usr
2.7G    /usr

请高手帮看看，是哪里的问题。

谢谢。

[fuge]

在 /opt 下面

[nbweb]

@fuge

opt 更小

```
root@debian:~# du -sh /opt
16K /opt
```

[nbweb]

root@debian:~# du -d1 -h /var/lib/docker/overlay2 | sort -h
24K /var/lib/docker/overlay2/547bae8b29ddc199407a94a84f98059ff4ef6cbad50bdb0e0a9b858b57562a09
36K /var/lib/docker/overlay2/8cec2d79bda5637bd30dd4c4a389845c081e5b66d3e459d70ef815a2cc75a7bf
40K /var/lib/docker/overlay2/8f7d5e2e8b3b170ad323567d51cbe90dc02e8826784dbbf7f321846bd7d009c0
40K /var/lib/docker/overlay2/ad36b711af0ed9f0fc42c6e02b43846883b8da88289d2a236945122f552fd8de-init
40K /var/lib/docker/overlay2/f338e2feb5125d730b106eaa7d3760ed41a8a2b7a9712e3386668d2feba3ed67-init
40K /var/lib/docker/overlay2/fb36ca008cec29247d60c476cf7516ee251a1eac9c3cdd84807fc2ab33ab1217-init
48K /var/lib/docker/overlay2/53cab8791c08e97ba594e604c7a39abf6958b0d94611ef017729e7a69f6a750a-init
80K /var/lib/docker/overlay2/d7eb00abe2492d9ec76693eb43be78941c669a76baf5da5f826f775c259ee8db
104K /var/lib/docker/overlay2/l
108K /var/lib/docker/overlay2/df9d7af75755da71593b70ea59e200f29ba5f9fb32e1e74c09a5aad277aa3c11
224K /var/lib/docker/overlay2/acb03b9a992c849edd678012f6497ccdaf7e84deb6c189eb0fd7b9b4aea6310b
304K /var/lib/docker/overlay2/9a1abdaf6b723905fbe4f6c1dc54396d8e32ae113dc4caa6e5c773b293c38c1a
12M /var/lib/docker/overlay2/99be51ffd7fe20fb556d2d18c7f029132ffba4a0efb67b07a840a91d04e21aeb
14M /var/lib/docker/overlay2/6d60b40fd81393bb4f724d81ccd15373b76ab0ba3175bfa4fd1a5aeced6d41d0
15M /var/lib/docker/overlay2/87156547dcccebaa223e3bb0311a44b8002b173a417f5963db7e32864a0b157a
22M /var/lib/docker/overlay2/765bfa08e78b66f7ebe90a06caa6c0f70f20af4269a0aee0c6fed81d5a99665b
34M /var/lib/docker/overlay2/ad36b711af0ed9f0fc42c6e02b43846883b8da88289d2a236945122f552fd8de
60M /var/lib/docker/overlay2/db204e2657372115b44731270ce44751ff6d33f67e18532592529d11a9d1d170
88M /var/lib/docker/overlay2/1a58843a5f605a6d9cc46fc4e6c60976838500d182e6d5e13b092f67d53575b1
125M /var/lib/docker/overlay2/9e3c37f8e0a43052dfd21f64ca1784912b0ab855b3bee4ba5db9cc70a97d912e
184M /var/lib/docker/overlay2/90f57b380741346be5e2f560ea825417c0dff2a1a0aa20ae4a5cb3b1e3cbe0b7
213M /var/lib/docker/overlay2/f338e2feb5125d730b106eaa7d3760ed41a8a2b7a9712e3386668d2feba3ed67
274M /var/lib/docker/overlay2/53cab8791c08e97ba594e604c7a39abf6958b0d94611ef017729e7a69f6a750a
274M /var/lib/docker/overlay2/c8848de1677a23275169af419f8dcae96b3684999430fdbd41ef1f4dda05e006
755M /var/lib/docker/overlay2/d2cf13ab0ed7ce006dd3fd6e0221b4a62f00c954cd689210487d94f77c5dc6c7
1.1G /var/lib/docker/overlay2/fb36ca008cec29247d60c476cf7516ee251a1eac9c3cdd84807fc2ab33ab1217
3.1G /var/lib/docker/overlay2

[nbweb]

很是奇怪，overlay2 实际只占 3.1G ，为什么显示占满了呢？

[fuge]

docker system df

docker system prune

[nbweb]

找到原因了，挂载 /mnt 时，写错了，导致把电影下载到 debian 下面 /mnt 里面，而不是陈列里面。