Ubuntu 16.04, Docker and zero space on volume “Filesystem root”

Earlier today I installed Docker and followed a few tutorials. When running a tutorial on using Docker with a barebones Meteor app, I got an error that there was not enough disk space, even though my /home partition has 17 GB free.

I restarted my computer and it informed me that The volume "Filesystem root" has 0 bytes disk space remaining. None of my browsers wanted to launch in such a suffocating space.

I ran sudo apt-get remove docker-ce docker-ce-cli containerd.io and this reclaimed 33.4 MB of disk space on /, which meant I could launch a browser and look for hints on how to reclaim more space. After removing an old kernel, running sudo apt autoremove --purge and sudo apt-get clean and removing a number of third-party apps that I haven't used for a while, I have been able to claim back a total of just over 800 MB, so at least I have some breathing space.

However, it seems a coincidence that the installation of Docker and the creation of half a dozen images led to my 19 GB / partition suddenly becoming saturated. It also seems that there must still be a lot of space that has not been released, forcing me to remove other files which previously caused no bother.

Is there something special that Docker does to /, and is there something I can do to I undo it, and avoid having it happen again?

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3,8G     0  3,8G   0% /dev
tmpfs           783M  9,6M  773M   2% /run
/dev/nvme0n1p5   19G   17G  776M  96% /
tmpfs           3,9G  468K  3,9G   1% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
/dev/nvme0n1p6  465M   80M  357M  19% /boot
/dev/nvme0n1p7   77G   57G   17G  78% /home
/dev/nvme0n1p1  496M   82M  415M  17% /boot/efi
tmpfs           783M   52K  783M   1% /run/user/1000
задан 29 July 2020 в 23:16

1 ответ

Получается, что:

  • Docker хранит свои образы и контейнеры в / var / lib / docker /
  • Для размещения приложения Meteor требуется 3 образа по 907 МБ каждый
$ docker images -a
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
<none>              <none>              33b3559a88ad        2 minutes ago       907MB
<none>              <none>              f2136da9e497        2 minutes ago       907MB
node                12.6                7c412a558705        12 months ago       907MB

Это (вместе с другими моими экспериментами) быстро заполнило мой раздел размером 19 ГБ.

Чтобы решить проблему, я последовал совету здесь , чтобы создать символическую ссылку из / var / lib / docker / в папку на более широкой равнине моего раздела / home . И мой раздел / благодарит меня за это:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3,8G     0  3,8G   0% /dev
tmpfs           783M  9,7M  773M   2% /run
/dev/nvme0n1p5   19G   15G  3,3G  82% /

Я также использовал docker rmi $ (docker images -a -q) и docker image prune для удаления огромные файлы, которые я создал во время экспериментов, которые больше не нужны.

ответ дан 2 August 2020 в 22:03

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