'Docker containers not listed

I am pretty new to Docker/Portainer, and try to get to understand the basics.

I have several Containers running (i can access them), which are not listed with "docker ps -a", for example a Drupal-container on http://0.0.0.0:8081/

I do see it on my Linux: root@plan:/home/andre# ps -aux | grep docker | grep 8081 root 1212 0.0 0.0 549052 3932 ? Sl 16:44 0:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 8081 -container-ip 172.17.0.4 -container-port 80

But "docker ps -a" does not list me the above container. I can't even find it's image with "docker images".

A restart of my Ubuntu session did not change anything.



Solution 1:[1]

The problem is that I have two versions of Docker installed, the following screenshots explains the problem:

enter image description here

Sources

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Source: Stack Overflow

Solution Source
Solution 1 André Pletschette