I have found my dockerd failed to start recently. I have traced logs and found that in /lib/systemd/system/containerd.service
it has a pre start command modprobe overlay
. Actually I’m using devicemapper
. So I’m confused, is module overlay always required even not using overlay as storage device?
BTW, I have found a interesting thing. overlay is existed when I run lsmod
but not found when I run modprobe overlay
. Could anyone tell me what’s going on?