Fatal Error
My Docker on macOS doesn’t start anymore. It shows the following
At the very last line, you can see the following Error Message: no space left on device
Disk full?
Of course there is enough space on my local drive available, but the Docker disk image see FAQ is full.
The disk image is located here ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2
With the qcow-tool you can check it:
$ /Applications/Docker.app/Contents/MacOS/qcow-tool info Docker.qcow2
((version Three) (backing_file_offset 0) (backing_file_size 0)
(cluster_bits 16) (size 68719476736) (crypt_method None) (l1_size 128)
(l1_table_offset ((bytes 131072) (is_mutable false) (is_compressed false)))
(refcount_table_offset
((bytes 65536) (is_mutable false) (is_compressed false)))
(refcount_table_clusters 1) (nb_snapshots 0) (snapshots_offset 0)
(additional
(((dirty true) (corrupt false) (lazy_refcounts true) (autoclear_features 0)
(refcount_order 4))))
(extensions
((Feature_name_table
(((ty Incompatible) (bit 0) (feature Dirty))
((ty Incompatible) (bit 1) (feature Corrupt))
((ty Compatible) (bit 0) (feature Lazy_refcounts)))))))
Okay, looks good so far! Now how can I resize it?
I wasn’t able to get it done with qcow-tool resize.
Therefore I tried the GUI
This helped only partially.
$ /Applications/Docker.app/Contents/MacOS/qcow-tool info Docker.qcow2
((version Three) (backing_file_offset 0) (backing_file_size 0)
(cluster_bits 16) (size 79999008768) (crypt_method None) (l1_size 150)
(l1_table_offset ((bytes 131072) (is_mutable false) (is_compressed false)))
(refcount_table_offset
((bytes 65536) (is_mutable false) (is_compressed false)))
(refcount_table_clusters 1) (nb_snapshots 0) (snapshots_offset 0)
(additional
(((dirty true) (corrupt false) (lazy_refcounts true) (autoclear_features 0)
(refcount_order 4))))
(extensions
((Feature_name_table
(((ty Incompatible) (bit 0) (feature Dirty))
((ty Incompatible) (bit 1) (feature Corrupt))
((ty Compatible) (bit 0) (feature Lazy_refcounts)))))))
The size changed from 68719476736 to 79999008768, but the error is still the same. Only the image size was changed, not the filesystem inside the image!
Resize the Filesystem
- Install QEMU
brew install qemu - Check the size `qemu-img info Docker.qcow2
- Download gparted-livecd http://gparted.org/download.php
- Start gparted
$ qemu-system-x86_64 -drive file=Docker.qcow2 -m 512 -cdrom ~/Downloads/gparted-live-0.31.0-1-i686.iso -boot d -device usb-mouse -usb
Screenshots
GParted booted
See the unallocated diskspace. Choose ‘Resize/Move’
Resize the FS
Apply
Done!
Cleanup
Maybe I need cleanup docker more often :-D I have several unused Images and lots of volumes.
$ docker system prune -a --volumes
WARNING! This will remove:
- all stopped containers
- all networks not used by at least one container
- all volumes not used by at least one container
- all images without at least one container associated to them
- all build cache
Are you sure you want to continue? [y/N] y
Deleted Containers:
a4b9806ee38e6d580a254e0b1222028a370871ff7229581ee37482f183b5e388
102b0202625200ce8b431d5805b85e44a3c74d825c7300129b22f36f3df278f9
5960e707837b9449b2f3a9923ea2d565893967e24207dd9cdd1b4ed6bf038546
...
Deleted Volumes:
05ad495fc7d561741583f7274a76542caa35be45bade0666d9ca1506aac8cb33
1727a9745c5790a1b4524222609c462922a31868a041fa9a9d126f087e505a5e
bb24a1bd60f2380dc0711da2ee3e9a7f7fbd7c0f12d7091906a704033b7c6e43
...
Deleted Images:
untagged: abiosoft/caddy:latest
untagged: abiosoft/caddy@sha256:bd2c4e17cf20f749f4ce1eb739cfb8a8f44e6d3740c1b16c573abb41b67f377e
deleted: sha256:52870bf7599892ef3ec5e275b559683ea3ad67e94c4ee03f8ed4f38f46957374
deleted: sha256:570f6d14f4c97d59e36b9fa7afd8fb028258236b9d851a7d20e91d1a476762ad
...
Total reclaimed space: 2.426GB
This should also help. But I was not able to get run properly on macOS (see also here)
Links
- stefanfoulis/docker_for_mac_disk_default_size.md
- Credit for this procedure goes to the conversation in https://forums.docker.com/t/consistently-out-of-disk-space-in-docker-beta/9438/6. Especially to jgielstra.