nvidia-docker : Unknown runtime specified nvidia

It seems you may need to purge docker and reinstall it as in the post:github issues

sudo apt remove docker-cesudo apt autoremovesudo apt-get install docker-ce=5:18.09.0~3-0~ubuntu-bionicsudo apt install nvidia-docker2

This is how I resolve the above problem for CentOS 7; hopefully it can help anyone who has similar problems.

• Add necessary repos to get nvidia-container-runtime:

distribution=$(. /etc/os-release;echo $ID$VERSION_ID)curl -s -L https://nvidia.github.io/nvidia-container-runtime/$distribution/nvidia-container-runtime.repo | sudo tee /etc/yum.repos.d/nvidia-container-runtime.repo

• (Optional) In my case, I disabled the experimental repos:

sudo yum-config-manager --disable libnvidia-container-experimentalsudo yum-config-manager --disable nvidia-container-runtime-experimental

• Install nvidia-container-runtime package:

sudo yum install nvidia-container-runtime

• Update docker daemon:

sudo vim /etc/docker/daemon.json

with the path to nvidia-container-runtime:

{    "runtimes": {        "nvidia": {            "path": "/usr/bin/nvidia-container-runtime",            "runtimeArgs": []        }    }}

• Finally, you need to make docker update the path:

sudo pkill -SIGHUP dockerd

Actually, you can try to restart docker daemon by following command.

sudo systemctl daemon-reloadsudo systemctl restart docker

Or you can try to reboot your system.to make nvidia-docker work