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Find the used hard disk data and solve disk pressure





I have a server which is running Ubuntu 18.04 and it is also a worker node for K8s. Sometimes I see that K8s is killing pods on this machine because of disk presseur and when I get df -h --total I can see that 85% (1.5T) of the disk is in use at /:



~$ df -h --total
Filesystem      Size  Used Avail Use% Mounted on
udev            126G     0  126G   0% /dev
tmpfs            26G  5.3M   26G   1% /run
/dev/sda2       1.8T  1.5T  276G  85% /
tmpfs           126G     0  126G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           126G     0  126G   0% /sys/fs/cgroup

/dev/loop0       90M   90M     0 100% /snap/core/7917
/dev/loop1       90M   90M     0 100% /snap/core/8039
/dev/sdb1       9.8G  203M  9.1G   3% /boot
/dev/sdb2       511M  6.1M  505M   2% /boot/efi
/dev/sdb3       1.8T  100M  1.7T   1% /home
/dev/loop2      128K  128K     0 100% /snap/austin/42
/dev/loop3      3.0M  3.0M     0 100% /snap/micro/648
tmpfs            26G     0   26G   0% /run/user/1001
total           4.0T  1.5T  2.4T  38% -



The problem is when I go to / and get sudo du -BG -s * I can just find 313G of that used data and nothing more:



/$ sudo du -BG -s *
1G  bin
1G  boot
0G  dev
1G  etc
1G  home
0G  initrd.img

0G  initrd.img.old
1G  lib
1G  lib64
1G  lost+found
1G  media
1G  mnt
1G  opt
du: cannot access 'proc/22512/task/22580/fdinfo/20': No such file or directory
du: cannot access 'proc/45752/task/45752/fd/4': No such file or directory
du: cannot access 'proc/45752/task/45752/fdinfo/4': No such file or directory

du: cannot access 'proc/45752/fd/3': No such file or directory
du: cannot access 'proc/45752/fdinfo/3': No such file or directory
0G  proc
1G  root
1G  run
1G  sbin
1G  snap
1G  srv
9G  swap.img
0G  sys

1G  tmp
3G  usr
313G    var
0G  vmlinuz
0G  vmlinuz.old


How I can find the rest of the data and solve the disk pressure problem?



Update




My problem/question was different from the suggested solution. In that case the problem was deleted files but my problem is docker. I post an answer so I can close this question.


Answer



I found a way to use lsof to show me the list of used files and sort them at https://unix.stackexchange.com/a/382696/380398 



sudo lsof \
| grep REG \
| grep -v "stat: No such file or directory" \
| grep -v DEL \
| awk '{if ($NF=="(deleted)") {x=3;y=1} else {x=2;y=0}; {print $(NF-x) "  " $(NF-y) } }'  \

| sort -n -u  \
| numfmt  --field=1 --to=iec


and when I used it I got:



118M  /usr/bin/kubelet
168M  /var/lib/docker/containers/ce98aeb3e061c31e81d232933fa21f055169924cd0411ec276d51ae008dbb993/ce98aeb3e061c31e81d232933fa21f055169924cd0411ec276d51ae008dbb993-json.log
185M  /var/lib/docker/containers/933c29608da9d954dc941fc741ffe0b012e6ec55a8befa95b8487f2367596577/933c29608da9d954dc941fc741ffe0b012e6ec55a8befa95b8487f2367596577-json.log
207M  /var/lib/docker/containers/2d4c2967fe22b1eb79b234e465f36ad062c8f390659c2f2f42ad31636be8a1be/2d4c2967fe22b1eb79b234e465f36ad062c8f390659c2f2f42ad31636be8a1be-json.log

272M  /var/lib/docker/containers/4b8daa87cda051a3b2bfd1b89c70763dca990b65b0eb211260f0e6d92b972da9/4b8daa87cda051a3b2bfd1b89c70763dca990b65b0eb211260f0e6d92b972da9-json.log
343M  /var/lib/docker/containers/52cb2d7fceb6bef7a01f7e5c666cb05e0eb62537d54a9b8da8865eba9e51c728/52cb2d7fceb6bef7a01f7e5c666cb05e0eb62537d54a9b8da8865eba9e51c728-json.log
1.1G  /var/lib/docker/containers/fe2c73fd47b37a7a5e70bd1f07508bec7dad024c75b859d933b6fa5bba649f18/fe2c73fd47b37a7a5e70bd1f07508bec7dad024c75b859d933b6fa5bba649f18-json.log
1.1G  /var/lib/docker/containers/8887ea0b31603e0a5b21c934ce06bb4a35133df2367eccb5ad9e2a07eb884bd3/8887ea0b31603e0a5b21c934ce06bb4a35133df2367eccb5ad9e2a07eb884bd3-json.log
42G  /var/lib/docker/containers/1f7180db9e41b66f3646bdf021644b23c1a954830191807532af813f5aa5cde6/1f7180db9e41b66f3646bdf021644b23c1a954830191807532af813f5aa5cde6-json.log
83G  /var/lib/docker/containers/a456e37303998844207c79fc3cdb63878765d7a3151c35051cb071545c75cec7/a456e37303998844207c79fc3cdb63878765d7a3151c35051cb071545c75cec7-json.log
220G  /var/lib/docker/containers/60aad026e90035790ff5f6f1ad714e6187bec5dfeb5b1d3156b7cda1d00cc251/60aad026e90035790ff5f6f1ad714e6187bec5dfeb5b1d3156b7cda1d00cc251-json.log
260G  /var/lib/docker/containers/52c866da942a3228ba56265210ef4f13fbc96ebc1c0214501df189901a829414/52c866da942a3228ba56265210ef4f13fbc96ebc1c0214501df189901a829414-json.log
560G  /var/lib/docker/containers/f56a9853ef993ce3843a2d6acf5c9603a283e64fb4b81d6523342c6ad03243ad/f56a9853ef993ce3843a2d6acf5c9603a283e64fb4b81d6523342c6ad03243ad-json.log



Which correctly sums up to 1.5T (if I also add other stuff that I could see before).


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