Docker failed to start.

[peter-snr]

Ansible fell over when trying to start the docker daemon.

Starting dockerd revealed the issue:-

sudo dockerd
INFO[2020-12-06T13:14:51.712175688Z] Starting up
INFO[2020-12-06T13:14:51.717032757Z] parsed scheme: "unix"                         module=grpc
INFO[2020-12-06T13:14:51.717061129Z] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2020-12-06T13:14:51.717083960Z] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock 0  <nil>}] <nil>}  module=grpc
INFO[2020-12-06T13:14:51.717094701Z] ClientConn switching balancer to "pick_first"  module=grpc
INFO[2020-12-06T13:14:51.719469363Z] parsed scheme: "unix"                         module=grpc
INFO[2020-12-06T13:14:51.719493234Z] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2020-12-06T13:14:51.719507424Z] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock 0  <nil>}] <nil>}  module=grpc
INFO[2020-12-06T13:14:51.719515835Z] ClientConn switching balancer to "pick_first"  module=grpc
failed to start daemon: error initializing graphdriver: overlay2: the backing xfs filesystem is formatted without d_type support, which leads to incorrect behavior. Reformat the filesystem with ftype=1 to enable d_type support. Backing filesystems without d_type support are not supported.

To fix, remove this from templates/daemon.json.j2

  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ],

CentOS Linux release 7.9.2009 (Core)
3.10.0-1160.6.1.el7.x86_64 #1 SMP Tue Nov 17 13:59:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux