The insecure-registries configuration is ignored beginning with version 29.0.0.

containerd image store が有効な場合の、Docker CLI による /etc/docker/daemon.json、docker info、docker push の処理から始めます。insecure-registries が push パスに到達する仕組みを追跡し、docker info で報告される設定と比較して、自己署名証明書を使用するレジストリへの push を成功させて再現することで完了を確認します。

Description

The containerd image store is the default storage backend for Docker Engine 29.0 and later on fresh installations or it can be enabled via:

  "features": {
    "containerd-snapshotter": true
  }

When enabled, insecure-registries configuration in /etc/docker/daemon.json is ignored.
docker info still shows the insecure registry but it has no effect and the attempt to push to given registry fails with:
failed to do request: Head "https://my.insecure.registry.com/v2/images/blobs/sha256:9f9449d1a8e45aa4c987a0de8a47f0844503ad8bd9f36d40f917d44baa55816a": tls: failed to verify certificate: x509: certificate signed by unknown authority

docker info
....
Insecure Registries:
  my.insecure.registry.com
  127.0.0.0/8
  ::1/128
...

insecure-registries configuration is useful in testing environments where self-signed certificates might be used.

Reproduce

1. Install fresh docker v29.1.3
2. Prepare e.g. my.insecure.registry.com registry with a self-signed cert
3. Configure insecure registries in /etc/docker/daemon.json: {"insecure-registries" : ["my.insecure.registry.com" ]}
4. restart docker
5. Push an image, e.g. docker push my.insecure.registry.com/images/myImage:latest

Expected behavior

docker push should work

docker version

docker version
Client: Docker Engine - Community
 Version:           29.1.3
 API version:       1.52
 Go version:        go1.25.5
 Git commit:        f52814d
 Built:             Fri Dec 12 14:52:44 2025
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          29.1.3
  API version:      1.52 (minimum version 1.44)
  Go version:       go1.25.5
  Git commit:       fbf3ed2
  Built:            Fri Dec 12 14:49:14 2025
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v2.2.1
  GitCommit:        dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:    29.1.3
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.30.1
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v5.0.1
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 3
 Server Version: 29.1.3
 Storage Driver: overlayfs
  driver-type: io.containerd.snapshotter.v1
 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 splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc version: v1.3.4-0-gd6d73eb8
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.17.13-200.fc42.x86_64
 Operating System: Fedora Linux 42 (Workstation Edition)
 OSType: linux
 Architecture: x86_64
 CPUs: 14
 Total Memory: 30.78GiB
 Name: fedora
 ID: a42ef4bf-e11b-4928-9603-89e607d452a8
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  my.insecure.registry.com
  127.0.0.0/8
  ::1/128
 Registry Mirrors:
  https://mirror.gcr.io/
 Live Restore Enabled: false
 Firewall Backend: iptables+firewalld

Additional Info

No response