docker.service start failed and set data-root folder rules ?

Description

I just want to upgrade my docker-compose version,because local machine version is different from Linux server(Production),so every deploy i must manual update the xxx.yml (such as update "port" to port ,add "version" tag),Lasterday i use below code to upgrade my docker-compose,unfortunately,docker.service is shutdown,and all container has been stoped and removed

 3630  yum update
 3652  yum install docker-compose-plugin

so i just reinstall docker.service and redeploy all services to maintain service worked for user.

after this all, docker ""data-root": has default setted on little space disk,because i removed daemon.json

mv /etc/docker/daemon.json /etc/docker/daemon.json.bak

the old docker has been setted on /mnt/data/docker when i update /etc/docker/daemon.json reset "data-root" on old folder"/mnt/data/docker" ,systemctl restart docker command has been failed,,so i remove daemon.json again,a few moments later, docker.service is restarted...

Question1: because /mnt/data/docker is not a empty folder so docker.service start failed? Question2: may i remove "/mnt/data/docker" folder? is it affect running container?

Reproduce

yum update yum install docker-compose-plugin yum remove docker yum install docker systemctl restart docker

Expected behavior

No response

docker version

Client: Docker Engine - Community
 Version:           24.0.4
 API version:       1.43
 Go version:        go1.20.5
 Git commit:        3713ee1
 Built:             Fri Jul  7 14:54:21 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          24.0.4
  API version:      1.43 (minimum version 1.12)
  Go version:       go1.20.5
  Git commit:       4ffc614
  Built:            Fri Jul  7 14:53:26 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.21
  GitCommit:        3dce8eb055cbb6872793272b4f20ed16117344f8
 runc:
  Version:          1.1.7
  GitCommit:        v1.1.7-0-g860f061
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:    24.0.4
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.1
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.19.1
    Path:     /usr/libexec/docker/cli-plugins/docker-compose
  scan: Docker Scan (Docker Inc.)
    Version:  v0.23.0
    Path:     /usr/libexec/docker/cli-plugins/docker-scan

Server:
 Containers: 26
  Running: 24
  Paused: 0
  Stopped: 2
 Images: 56
 Server Version: 24.0.4
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: active
  NodeID: v5ki6h22i3xb315b3gnhrnhfw
  Is Manager: true
  ClusterID: 70ax11y59op9pxb6iv2oraqg6
  Managers: 1
  Nodes: 1
  Default Address Pool: 10.0.0.0/8
  SubnetSize: 24
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: 172.17.155.178
  Manager Addresses:
   172.17.155.178:2377
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3dce8eb055cbb6872793272b4f20ed16117344f8
 runc version: v1.1.7-0-g860f061
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
 Kernel Version: 3.10.0-1160.92.1.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 61.76GiB
 Name: ubuntu01
 ID: 3f942f7d-26e0-4169-ad11-b2bd481e6830
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Diagnostics ID

i don't know...

Additional Info

No response

docker / desktop-linux