Fixing "Docker error : no space left on device" by increasing the size of your CoreOS VM
You might get this error especially with very large projects. We are assuming that your setup is:
- Your local “bare metal” computer (can be any OS).
- CoreOS running on Vagrant and VirtualBox.
- Containers running via Docker on CoreOS.
We are assuming also that you have sufficient free space on your local computer.
Start by confirming that your bare metal computer has sufficient space:
df -h / Filesystem Size Used Avail Capacity iused ifree %iused Mounted on /dev/disk1 465Gi 403Gi 61Gi 87% 105788027 16058281 87% /
Here, we have 61G available. Make sure that this is enough for your project by adding free space to your laptop.
ssh into your CoreOS virtual machine and perform the same operation.
$ df -h / Filesystem Size Used Avail Use% Mounted on /dev/sda9 16G 7.7G 7.2G 52% /
In this case we have 7.2G available on CoreOS with a total of 16G. If this is insufficient for your project, start by installing this script on your CoreOS box, and run it to remove unused containers and images.
If that is not enough, you will need to increase the size of your VM. Here is how.
Start by backing up all important data on your VM and destroying it:
Now, locate the
.vmdk image you’re using, it should be something like:
Changing its size is a painful process, and involves converting the box to another format, but the following commands should do it (taken from this GitHub issue):
cd ~/.vagrant.d/boxes/coreos-alpha/752.1.0/virtualbox/ VBoxManage clonehd coreos_production_vagrant_image.vmdk temp.vdi --format vdi VBoxManage modifyhd temp.vdi --resize 61440 VBoxManage clonehd temp.vdi resized-disk.vmdk --format vmdk rm coreos_production_vagrant_image.vmdk temp.vdi mv resized-disk.vmdk coreos_production_vagrant_image.vmdk
vagrant up your box and log into it:
vagrant up vagrant ssh
You should be seeing more memory:
df -h / Filesystem Size Used Avail Use% Mounted on /dev/sda9 56G 23M 54G 1% /
Rebuild your Docker container and you should no longer be seeing the
Docker error : no space left on device error.