Docker Engine - v26.0.0-rc1

26.0.0-rc1

For a full list of pull requests and changes in this release, refer to the relevant GitHub milestones:

• docker/cli, 26.0.0 milestone
• moby/moby, 26.0.0 milestone
• Deprecated and removed features, see Deprecated Features.
• Changes to the Engine API, see API version history.

New

• Add Subpath field to the VolumeOptions making it possible to mount a subpath of a volume. moby/moby#45687
• containerd image store: image list will no longer produce multiple duplicates image entries for multi-platform images moby/moby#45967

Bug fixes and enhancements

• To preserve backwards compatibility, read-only mounts are not recursive by default when using older clients (API version < v1.44). moby/moby#47391
• Fix ADD Dockerfile instruction failing with lsetxattr <file>: operation not supported when unpacking archive with xattrs onto a filesystem that doesn't support them. moby/moby#47175
• Fix docker start failing when used with --checkpoint moby/moby#47456
• Always try to enable IPv6 on a container's loopback interface, and only include IPv6 in '/etc/hosts' if successful. moby/moby#47062
• Restore IP connectivity between the host and containers on an internal bridge network. moby/moby#47356
• Do not enforce new validation rules for existing swarm networks moby/moby#47361
• Restore DNS names for containers in the default "nat" network on Windows. moby/moby#47375
• containerd image store: Isolate images with different containerd namespaces when --userns-remap option is used moby/moby#46786
• containerd image store: Fix image pull not emitting Pulling fs layer status moby/moby#47432
• Ensure that a generated MAC address is not restored when a container is restarted, but a configured MAC address is preserved. moby/moby#47233

  [!NOTE]
  Containers created using 25.0.0 may have duplicate MAC addresses, they must be re-created.
  Containers created using 25.0.0 or 25.0.1 with user-defined MAC addresses will get generated MAC addresses when they are started using 25.0.2. They must also be re-created.

API

• GET /images/{id}/json omits the Created field (previously it was 0001-01-01T00:00:00Z) if the Created field is missing from the image config. moby/moby#47451
• Populate a missing Created field in GET /images/{id}/json with 0001-01-01T00:00:00Z for API version <= 1.43. moby/moby#47387

Packaging updates

• Upgrade Go runtime to 1.21.7. moby/moby#47385
• Update BuildKit to v0.13.0-rc3 moby/moby#47364
• Update containerd binary to v1.7.13 moby/moby#47278
• Update runc binary to v1.1.12 moby/moby#47268
• Update Rootlesskit to v2.0.1 moby/moby#47332
• Update OTEL to v0.46.1 / v1.21.0 moby/moby#47245

Removed

• Disable pulling of deprecated image formats by default. These image formats are deprecated, and support will be removed in a future version. moby/moby#47459
• image: remove deprecated IDFromDigest moby/moby#47198
• Removed the deprecated github.com/docker/docker/pkg/loopback package. moby/moby#47128
• pkg/system: remove deprecated ErrNotSupportedOperatingSystem, IsOSSupported moby/moby#47129
• pkg/homedir: remove deprecated Key() and GetShortcutString() moby/moby#47130
• pkg/containerfs: remove deprecated ResolveScopedPath moby/moby#47131
• The daemon flag --oom-score-adjust has been deprecated in v24.0 and is now removed. moby/moby#46113
• API: remove deprecated API versions (API < v1.24) moby/moby#47155
• Remove deprecated aliases from the api/types package. These types were deprecated in v25.0.0, which provided temporary aliases. moby/moby#47148
  These aliases are now removed: types.Info, types.Commit, types.PluginsInfo, types.NetworkAddressPool, types.Runtime, types.SecurityOpt, types.KeyValue, types.DecodeSecurityOptions, types.CheckpointCreateOptions, types.CheckpointListOptions, types.CheckpointDeleteOptions, types.Checkpoint, types.ImageDeleteResponseItem, types.ImageSummary, types.ImageMetadata, types.ServiceUpdateResponse, types.ServiceCreateResponse, types.ResizeOptions, types.ContainerAttachOptions, types.ContainerCommitOptions, types.ContainerRemoveOptions, types.ContainerStartOptions, types.ContainerListOptions, types.ContainerLogsOptions