Add After=dbus.service to containerd.service

[yankay]

What would you like to be added

Like: containerd/containerd#10798

Add it to https://github.com/kubernetes-sigs/kubespray/blob/master/roles/container-engine/containerd/templates/containerd.service.j2

Why is this needed

containerd launches runc, which communicates via dbus with systemd to start transient units. Thus, containerd should have an After dependency on dbus.service to prevent dbus from being shut down concurrently with containerd.

[yankay]

Pending the discussion of containerd/containerd#10798 (comment)

[VannTen]

I think @champtar is right. dbus is pretty essential to systemd operation, and unless you opt out of the defaults dependency because you're an early boot service, you don't need to care about that (honestly, the local-fs.target and network.target might also be overkill)

[VannTen]

Yeah local-fs.target is implied by basic.target (see man 7 bootup)