Comment 22 for bug 1870514

As a workaround I opted for using a systemd unit file to create a loose dependency between containerd and dockerd.

Here's how:

As root:

Make the override directory (permission 755)

mkdir /etc/systemd/system/containerd.service.d/

Create the override file in the above directory (permissions 644)

vi override.conf

Add the following to the file

[Unit]
Before=docker.service
Wants=docker.service

Restart systemd daemon

systemctl daemon-reload

Check it works

Stop containerd

systemctl stop containerd

Check dockerd has stopped

systemctl status docker

Start containerd

systemctl start containerd

Check dockerd has started

systemctl status docker
++++++++++++++++++++++++++

Some links to other documentation on the subject

https://www.shellhacks.com/systemd-service-file-example/

https://man7.org/linux/man-pages/man5/systemd.service.5.html