Missing folder /etc/docker after fresh install

[CTaeumel]

Description

The current version of docker (Ubuntu 20.04 & 22.04) according to https://docs.docker.com/engine/install/ubuntu/ (Packages: docker-ce docker-ce-cli containerd.io) doesn't create the folder /etc/docker . I think this is a bug, because past versions have created this folder.

Reproduce

1. sudo apt-get update
2. sudo apt-get install ca-certificates curl gnupg lsb-release
3. sudo mkdir -m 0755 -p /etc/apt/keyrings
4. curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
5. echo
   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu
   $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
6. sudo apt-get update
7. sudo apt-get install docker-ce docker-ce-cli containerd.io
   --> /etc/docker is missing

Expected behavior

/etc/docker is existing

docker version

Client: Docker Engine - Community
 Version:           23.0.0
 API version:       1.42
 Go version:        go1.19.5
 Git commit:        e92dd87
 Built:             Wed Feb  1 17:49:08 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          23.0.0
  API version:      1.42 (minimum version 1.12)
  Go version:       go1.19.5
  Git commit:       d7573ab
  Built:            Wed Feb  1 17:49:08 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.16
  GitCommit:        31aa4358a36870b21a992d3ad2bef29e1d693bec
 runc:
  Version:          1.1.4
  GitCommit:        v1.1.4-0-g5fd4c4d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:           23.0.0
 API version:       1.42
 Go version:        go1.19.5
 Git commit:        e92dd87
 Built:             Wed Feb  1 17:49:08 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          23.0.0
  API version:      1.42 (minimum version 1.12)
  Go version:       go1.19.5
  Git commit:       d7573ab
  Built:            Wed Feb  1 17:49:08 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.16
  GitCommit:        31aa4358a36870b21a992d3ad2bef29e1d693bec
 runc:
  Version:          1.1.4
  GitCommit:        v1.1.4-0-g5fd4c4d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
degkm@sandbox-ubuntu-2004:~$ sudo docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.10.2
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.15.1
    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: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 23.0.0
 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: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 31aa4358a36870b21a992d3ad2bef29e1d693bec
 runc version: v1.1.4-0-g5fd4c4d
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
 Kernel Version: 5.4.0-137-generic
 Operating System: Ubuntu 20.04.5 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 7.771GiB
 Name: sandbox-ubuntu-2004
 ID: b646fedd-c911-41ec-991d-152dc0ed73ff
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No swap limit support

Additional Info

No response

[bsousaa]

quoting from: jpetazzo/container.training#625 (comment)

We were discussing this, and the /etc/docker directory was previously created as a side-effect of a legacy functionality for schema 2 v1 images ("libtrust"), which created a key.json in this path.
In general, as this directory is not guaranteed to be present (it's an optional path to store config files). That said, we'll make a change in the .deb and .rpm packages to automatically create an empty directory on installation;

docker/docker-ce-packaging#841
docker/docker-ce-packaging#842

This directory is not guaranteed to be there. If you need create it manually first.

(docs may need some improvement to explain this better)

[neersighted]

This is also in the 23.0.1 release notes:

Add /etc/docker to RPM and DEB packaging. docker/docker-ce-packaging#842
Not all use cases will benefit; if you depend on this, you should explicitly mkdir -p /etc/docker.

[thaJeztah]

This should be fixed by docker/docker-ce-packaging#842, but the recommendation is to check for the presence of the directory, and where needed to create it and/or set the permissions correctly (see moby/moby#41386)