root@aishitou:~# ps aux | grep dockerd
root        6745 12.5  4.1 2785324 83184 ?       Ssl  23:14   0:03 /usr/bin/dockerd -H fd:// --container d=/run/containerd/containerd.sock
root        7729  0.0  0.1   6544  2304 pts/1    S+   23:15   0:00 grep --color=auto dockerd
root@aishitou:~# cat /etc/systemd/system/docker.service.d/override.conf
cat: /etc/systemd/system/docker.service.d/override.conf: No such file or directory
root@aishitou:~# sudo mkdir -p /etc/systemd/system/docker.service.d/
root@aishitou:~# sudo vi /etc/systemd/system/docker.service.d/override.conf
root@aishitou:~# sudo systemctl daemon-reload
root@aishitou:~# sudo systemctl restart docker
root@aishitou:~# ps aux | grep dockerd
root        8178 13.8  4.1 2785580 82124 ?       Ssl  23:17   0:02 /usr/bin/dockerd --ipv6=false -H fd:/ / --containerd=/run/containerd/containerd.sock
root        9120  0.0  0.1   6544  2304 pts/1    S+   23:18   0:00 grep --color=auto dockerd