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Rootless Docker Service doesn't use native overlayfs ( Native Overlay Diff: false) #43626

@sighoya

Description

@sighoya

Rootless Docker Service doesn't use native overlayfs

Rootless Docker Service doesn't use native overlayfs despite modprobe options:
options overlay metacopy=off redirect_dir=off
whereas, the root Docker service works as expected.

Steps to reproduce the issue:

  1. export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/docker.sock
  2. systemctl --user start docker.service
  3. docker info | grep Native

Describe the results you received:
Native Overlay Diff: false

Describe the results you expected:
Native Overlay Diff: true

Output of docker version:

Docker version 20.10.16, build aa7e414fdc

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.2-docker)
  compose: Docker Compose (Docker Inc., 2.5.1)

Server:
 Containers: 6
  Running: 2
  Paused: 0
  Stopped: 4
 Images: 4
 Server Version: 20.10.16
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: false
  userxattr: true
 Logging Driver: json-file
 Cgroup Driver: none
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 212e8b6fa2f44b9c21b2798135fc6fb7c53efc16.m
 runc version: 
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  rootless
  cgroupns
 Kernel Version: 5.15.40-1-lts
 Operating System: Arch Linux
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 62.47GiB
 Name: phantom
 ID: SMDW:PBEU:YHFR:NAVA:5WGK:ELUL:YRF3:SIHN:JEZB:FV52:LQZD:GUSE
 Docker Root Dir: /home/sighoya/vm/docker
 Debug Mode: true
  File Descriptors: 40
  Goroutines: 59
  System Time: 2022-05-21T16:02:20.585738277+02:00
  EventsListeners: 0
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: true
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: Running in rootless-mode without cgroups. Systemd is required to enable cgroups in rootless-mode.

Additional environment details (AWS, VirtualBox, physical, etc.):
ArchLinux Linux phantom 5.15.40-1-lts #1 SMP Sun, 15 May 2022 19:07:59 +0000 x86_64 GNU/Linux

See also: #41802

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