After installation or just after a an OS update or some package update docker engine starts to complain about insufficient permissions.
Particularly it complains about permission to access /var/run/docker.sock
docker ps
// permission denied message
$> ls -la /var/run/docker.sock
The output should show root:docker as {ownder}:{group}.
Run also
ls -l /lib/systemd/system/docker.socket
The output should show root:docker as {ownder}:{group}.
If it shows root:root there is a problem
sudo chgrp docker /lib/systemd/system/docker.socket
Check the following:
groups
Current user should be member of these groups: docker, kvm.
if the docker group doesn't exist add it
sudo groupadd docker
If the new group is added or the group is there but current user is not a member, add it.
sudo usermod -aG kvm $USER
The current user now should be visible in group file /etc/group
or when running
getent group
or simply
groups
If not try running:
sudo su $USER -c groups
If the list of groups contain kvm and docker you need to log out and log back in or somehow restart system-auth.
After that it should work or there is further problem unrelated to the above.
verify
docker ps
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