Docker hangs when pulling images or runing containers

user_16870402 0
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I'm facing a strange behavior using docker on Ubuntu 20.04 (I'm using this in a corporate environment). Since 2 days, I'm completely unable to run containers or even pull images from Docker Hub.

When trying to pull any image from Docker Hub (even the hello-world), the image is downloaded locally and then docker freezes as you can see on the following picture docker run hello-world

I first tried to restart the docker daemon and even the machine (as this is my development computer) => NOK.

Then I tried to completely reinstall the docker package and all its dependencies using the following commands:

sudo apt purge docker docker.io
sudo apt autoremove --purge docker docker.io
sudo rm -rf /var/lib/docker
sudo rm -rf /etc/docker
rm -rf ~/.docker
sudo apt install docker.io

Result => NOK.

The next step was to reinstall my Ubuntu 20.04 machine => NOK.

I also tried to limit simultaneous connections of docker daemon to only one as I read on some forums some people have experienced similar problems and they solved this by limiting simultaneous connections => NOK

I tried to move the location of the docker root folder by adding the following content to /etc/docker/daemon.json => NOK.

{
   "data-root": "/var/lib/docker"
}

I added --debug flag to dockerd command line to get more info on what's happening and here is what I get when I try to run hello-world container:

sept. 09 16:09:38 dockerd[1842]: time="2021-09-09T16:09:38.582649566+02:00" level=debug msg="pulling blob \"sha256:b8dfde127a2919ff59ad3fd4a0776de178a555a76fff77a506e128aea3ed41e3\""
sept. 09 16:09:39 dockerd[1842]: time="2021-09-09T16:09:39.290277164+02:00" level=debug msg="Downloaded b8dfde127a29 to tempfile /var/lib/docker/tmp/GetImageBlob129841538"
sept. 09 16:09:39 dockerd[1842]: time="2021-09-09T16:09:39.290586225+02:00" level=debug msg="Using /usr/bin/unpigz to decompress"
sept. 09 16:09:39 dockerd[1842]: time="2021-09-09T16:09:39.296254339+02:00" level=debug msg="Applying tar in /var/lib/docker/overlay2/91e5944b0c0d34d010b4f28036e29d47213266af5677660edbb00470160fb186/diff" storage-driver=overlay2

The blob is present into /var/lib/docker/tmp and the folder /var/lib/docker/overlay2/91e5944b0c0d34d010b4f28036e29d47213266af5677660edbb00470160fb186/diff is created but is empty.

ubuntu-20.04 docker
2 Answers

Finally, the problem origin was a bad configuration of the docker so that it can work into our corporate network. After flushing the docker once again => reinstall => reconfigure completely => OK

user_168704020

Have experienced a very similar behavior and similar debug output. Also in a corporate environment. The following WSL issue suggested that it might be related to the anti-virus program. In my case turning of the anti-virus program "solved" the problem.

user_33052510
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