Errno::ENOSPC: No space left on device

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@sam I’m trying to remove an existing image but I can’t seem to remove it

root@ip-172-31-27-60:/var/discourse# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
local_discourse/app   latest              2bc4af777b30        12 days ago         2.284 GB
discourse/discourse   1.3.8               7f8853cc1cb9        4 weeks ago         1.534 GB

root@ip-172-31-27-60:/var/discourse# docker rmi 7f8853cc1cb9
Error response from daemon: conflict: unable to delete 7f8853cc1cb9 (cannot be forced) - image has dependent child images

I’m not sure how else to free up space on my system (I’m not exactly a tech guru)

root@ip-172-31-27-60:/var/discourse# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            476M     0  476M   0% /dev
tmpfs           100M   11M   89M  11% /run
/dev/xvda1      7.8G  7.1G  253M  97% /
tmpfs           496M  1.3M  495M   1% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           496M     0  496M   0% /sys/fs/cgroup
none            7.8G  7.1G  253M  97% /var/lib/docker/aufs/mnt/7a2649494208457846b47f6209a368e3986d8b2bfaf3ff9b2dcb25b14f3ece0d
shm              64M  4.0K   64M   1% /var/lib/docker/containers/90f51aff6b681c0b16084c37c3934d117f006dbdbeb9465ab87fa97db6d1983b/shm
tmpfs           100M     0  100M   0% /run/user/1001

Any suggestions?

I have very limited free space on discourse right now and I’m afraid it may crash or something.
I understand my total space is quite small but that’s because I’m hosting on AWS (t2.micro)

Also I get this error when I try to run cleanup:

root@ip-172-31-27-60:/var/discourse# sudo ./launcher cleanup

WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed

Please be patient

Unable to find image 'discourse/discourse:1.3.9' locally
1.3.9: Pulling from discourse/discourse
b87f06441b40: Pulling fs layer
69c598d5b6ca: Pulling fs layer
b87f06441b40: Verifying Checksum
b87f06441b40: Download complete
69c598d5b6ca: Verifying Checksum
69c598d5b6ca: Download complete
/usr/bin/docker: failed to register layer: Error processing tar file(exit status 1): write /var/lib/dpkg/status-old: no space left on device.
See '/usr/bin/docker run --help'.
Your Docker installation is not working correctly

See: How do I debug docker installation issues