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Encrypted home volume not accessible. #9305

@animalillo

Description

@animalillo

Description

When setting up a docker-compose.yml with a service configured with restart: always and a mount relative to the home directory of an user encrypted home. It fails to list the files after said user has logged in and the encrypted files become accessible on the system.

Steps to reproduce the issue:

  1. Set up an user with an encrypted home and docker access on a linux machine (Ubuntu 21.10 for example).
  2. Set up a service with restart: always and run up -d with a volume mounted inside said user's home directory.
  3. Add some files on the mounted volume.
  4. Check that files are accessible inside the running container
  5. Restart the machine
  6. Login as said user
  7. docker exec -it service_name bash
  8. Check that the files are no longer accessible in the running container.

Describe the results you received:
When the container runs at boot the mounted volume files are not accessible even after they become accessible form the host machine.

Describe the results you expected:
I expected the files to not be accessible while they are encrypted but to become accessible after the user logged in to their machine and the files became accessible on the filesystem.

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker compose version:

docker-compose version 1.26.0, build d4451659

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Docker Buildx (Docker Inc., v0.8.0-docker)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 5
  Running: 5
  Paused: 0
  Stopped: 0
 Images: 41
 Server Version: 20.10.13
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 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: 2a1d4dbdb2a1030dc5b01e96fb110a9d9f150ecc
 runc version: v1.0.3-0-gf46b6ba
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.13.0-35-generic
 Operating System: Ubuntu 21.10
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 31.24GiB
 Name: marcos-wg
 ID: BEYH:NRGA:7QED:XDNT:HENC:VCVE:POQQ:T7HA:N3WS:OTS3:X4RU:BTL6
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Additional environment details:
Ubuntu 21.04, probably happening on any encrypted home setup

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