Docker takes 4 minutes to start on debian - docker

Question

I observed that the docker takes 4 minutes to start each time after reboot. I have provided some details as attached. Any thoughts/tips are appreciated. Thanks.
Debian
-> docker -v
Docker version 18.03.0-ce, build 0520e24
-> uname -a
Linux x 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1 (2018-04-29) x86_64 GNU/Linux
Other logs:
-> systemd-analyze blame
4min 21.855s docker.service
2.863s cloud-final.service
2.021s cloud-init-local.service
1.698s cloud-init.service
1.476s cloud-config.service
…
21ms systemd-tmpfiles-clean.service
19ms systemd-update-utmp.service
18ms docker.socket
-> sudo journalctl -u docker.service
– Logs begin at Sun 2018-05-06 20:49:58 PDT, end at Sun 2018-05-06 21:11:45 PDT. –
May 06 20:50:02 x systemd[1]: Starting Docker Application Container Engine…
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23.757674968-07:00” level=debug msg=“Listener created for HTTP on fd ()”
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23.769857584-07:00” level=info msg=“libcontainerd: started new docker-containerd process” pid=1328
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“starting containerd” module=containerd revision=cfd04396dc68220d1cecbe686a6cc3aa5ce3667c version=v1.0.2
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=debug msg=“changing OOM score to -500” module=containerd
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.content.v1.content”…” module=containerd type=io.containerd.content.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.snapshotter.v1.btrfs”…” module=containerd type=io.containerd.snapshotter.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=warning msg=“failed to load plugin io.containerd.snapshotter.v1.btrfs” error="path /var/lib/docker/containerd/daemon/io.containerd.sn
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.snapshotter.v1.overlayfs”…” module=containerd type=io.containerd.snapshotter.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.metadata.v1.bolt”…” module=containerd type=io.containerd.metadata.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=warning msg=“could not use snapshotter btrfs in metadata plugin” error="path /var/lib/docker/containerd/daemon/io.containerd.snapshot
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.differ.v1.walking”…” module=containerd type=io.containerd.differ.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.gc.v1.scheduler”…” module=containerd type=io.containerd.gc.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.grpc.v1.containers”…” module=containerd type=io.containerd.grpc.v1
May 06 20:54:23 x dockerd[654]: time=“2018-05-06T20:54:23-07:00” level=info msg=“loading plugin “io.containerd.grpc.v1.content”…” module=containerd type=io.containerd.grpc.v1
I posted the question in docker forum, but got no luck.
https://forums.docker.com/t/docker-takes-4-minutes-to-start-on-debian/50441
====== updated #1
System info: 1G RAM, 25 GB SSD, Clean system (just installed)
> docker info
xiejw:x -> docker info
Containers: 8
Running: 3
Paused: 0
Stopped: 5
Images: 15
Server Version: 18.03.0-ce
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 4.9.0-6-amd64
Operating System: Debian GNU/Linux 9 (stretch)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 996.5MiB
Name: x
ID: Y3MP:DHWK:4VES:2LEZ:RHJK:UFCB:HX2W:4CK2:XHBI:CG7B:PBT3:2LTG
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
File Descriptors: 37
Goroutines: 45
System Time: 2018-05-09T10:44:20.217001219-07:00
EventsListeners: 0
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
WARNING: No swap limit support