'Error response from daemon: Cannot kill container: permission denied, how to kill docker containers on Ubuntu 20.04?

I'm trying to kill a docker container, but I got permission denied. I use Ubuntu 20.04, my docker version for client is 20.10.7 and the one for the server is 20.10.11.

This is the log I got:

Error response from daemon: Cannot kill container: fastapi_server: permission denied

I read that I should use this comand for restarting docker.

sudo systemctl restart docker.socket docker.service

But the thing is that when I execute this command, all my containers and images dissapear, but If I try on localhost:8000 my port is occupied by the container that I wanted to delete. And if I run sudo netstat -anp | grep 8000, I get:

tcp        0      0 0.0.0.0:8000            0.0.0.0:*               LISTEN    2493/docker-proxy   
tcp6       0      0 :::8000                 :::*                    LISTEN    2500/docker-proxy

So this confirms that my port is already taken by a docker container, but when I run docker ps -a, I get no container. I also tried docker kill, but it did not work.

How should I kill this container & get my 8000 port free?

dockerubuntukill-process


Solution 1:[1]

Please think twice before removing AppArmor. To my understanding this is central to application security for instance on recent major Ubuntu versions.

It seems the rights problem is specific to a Docker version. Assuming yours is also installed via snap, please attempt upgrading your Docker version to at least the current beta, e.g. with

snap refresh docker --beta

20.10.12 seems to work fine.

(In fact I fell for the suggestion and did remove my AppArmor - snaps went away. Then reinstalled ASAP, the settings of relevant snaps are still with me - afterwards installed docker back, had the problem, upgraded it: seems to work like a charm.)

Solution 2:[2]

Try these steps:

docker inspect

Find the PID AND kill that process.

If that does not work check with

dmesg

everything related to Docker. You can put output here that we can help you.

Ok,from you png ist seems that you have problem with AppArmor. Try this:

sudo apt purge --auto-remove apparmor
sudo service docker restart
docker system prune --all --volumes

Sources

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Source: Stack Overflow

Solution Source
Solution 1 brezniczky
Solution 2

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