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We have a docker hosted in Ubuntu 4.4.0-93-generic.
When I tried to create a container I got this error:

INTERNAL ERROR: Cannot create temporary directory!

After some research, I found it was due to the disk space (or lack thereof)

I used df to show the disk space. I am not able to understand the below information, 

Filesystem                        Size  Used Avail Use% Mounted on     
udev                              504G     0  504G   0% /dev           
tmpfs                             101G   42M  101G   1% /run           
/dev/mapper/dev--ubuntu--vg-root   27G   27G     0 100% /              
tmpfs                             504G  428K  504G   1% /dev/shm       
tmpfs                             5.0M     0  5.0M   0% /run/lock      
tmpfs                             504G     0  504G   0% /sys/fs/cgroup 
/dev/sda1                         472M  106M  342M  24% /boot          
/dev/mapper/dev--ubuntu--vg-home   51G  281M   48G   1% /home          
none                               27G   27G     0 100% /var/lib/docker
shm                                64M     0   64M   0% /var/lib/docker
none                               27G   27G     0 100% /var/lib/docker
shm                                64M     0   64M   0% /var/lib/docker
tmpfs                             101G     0  101G   0% /run/user/1000

Could anyone please explain what this is and am I running out of space?

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  • Could you copy/paste the output of df instead of taking a screenshot? – SIGSTACKFAULT Oct 19 '17 at 15:11
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    Basically var directory is part of your root file system and this is at 100%. Luckily, you are using logical volumes and so you can provision further disks if required and add the space to the volume. – Raman Sailopal Oct 19 '17 at 15:16
  • On second thought, do df -h – SIGSTACKFAULT Oct 19 '17 at 15:20
  • Do you have any link where I could learn more details on this ? – Raajkumar Oct 19 '17 at 15:21
  • Try this, this or this – SIGSTACKFAULT Oct 19 '17 at 15:23
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Long story short, this means that your root filesystem is totally full.

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  • There's a green checkmark beside the up/down arrows; click it to set this answer as accepted. Ty <3 – SIGSTACKFAULT Oct 19 '17 at 15:20
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It means that your root storage is full, check by df -h.

This method might help you up with removing stale docker images by command below:

docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

Or using:

docker image prune
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