Docker 4.35.0 listens on port 8888, preventing mapping container ports to 8888

[richard-moats-tc]

Description

Moving from Docker for Mac 4.34.3 to 4.35.0, with no user containers running, the com.docker.backend process has started listening (with an HTTP server, it seems) on IPv6 port 8888:

com.docker.backend      2469 richard.moats   46u  IPv6 0xbf4e0784a52b6017      0t0  TCP *:8888 (LISTEN)

Starting a container that exposes a port mapped to port 8888 thus fails:

ERROR: for config-backend  Cannot start service config-backend: Ports are not available: exposing port TCP 0.0.0.0:8888 -> 0.0.0.0:0: listen tcp4 0.0.0.0:8888: bind: address already in use

Reproduce

1. docker run -it --rm -p 8888:8888/tcp nginx:alpine

result:

docker: Error response from daemon: Ports are not available: exposing port TCP 0.0.0.0:8888 -> 0.0.0.0:0: listen tcp4 0.0.0.0:8888: bind: address already in use.

Expected behavior

Docker should not block containers from exposing an IP port on any host IP port.

docker version

Client: Version: 27.3.1 API version: 1.47 Go version: go1.22.7 Git commit: ce12230 Built: Fri Sep 20 11:38:18 2024 OS/Arch: darwin/arm64 Context: desktop-linux

Server: Docker Desktop 4.35.0 (172550) Engine: Version: 27.3.1 API version: 1.47 (minimum version 1.24) Go version: go1.22.7 Git commit: 41ca978 Built: Fri Sep 20 11:41:19 2024 OS/Arch: linux/arm64 Experimental: true containerd: Version: 1.7.21 GitCommit: 472731909fa34bd7bc9c087e4c27943f9835f111 runc: Version: 1.1.13 GitCommit: v1.1.13-0-g58aa920 docker-init: Version: 0.19.0 GitCommit: de40ad0

docker info

Client: Version: 27.3.1 Context: desktop-linux Debug Mode: false Plugins: buildx: Docker Buildx (Docker Inc.) Version: v0.17.1-desktop.1 Path: /Users/richard.moats/.docker/cli-plugins/docker-buildx compose: Docker Compose (Docker Inc.) Version: v2.29.7-desktop.1 Path: /Users/richard.moats/.docker/cli-plugins/docker-compose debug: Get a shell into any image or container (Docker Inc.) Version: 0.0.37 Path: /Users/richard.moats/.docker/cli-plugins/docker-debug desktop: Docker Desktop commands (Alpha) (Docker Inc.) Version: v0.0.15 Path: /Users/richard.moats/.docker/cli-plugins/docker-desktop dev: Docker Dev Environments (Docker Inc.) Version: v0.1.2 Path: /Users/richard.moats/.docker/cli-plugins/docker-dev extension: Manages Docker extensions (Docker Inc.) Version: v0.2.27 Path: /Users/richard.moats/.docker/cli-plugins/docker-extension feedback: Provide feedback, right in your terminal! (Docker Inc.) Version: v1.0.5 Path: /Users/richard.moats/.docker/cli-plugins/docker-feedback init: Creates Docker-related starter files for your project (Docker Inc.) Version: v1.3.0 Path: /Users/richard.moats/.docker/cli-plugins/docker-init sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.) Version: 0.6.0 Path: /Users/richard.moats/.docker/cli-plugins/docker-sbom scout: Docker Scout (Docker Inc.) Version: v1.14.0 Path: /Users/richard.moats/.docker/cli-plugins/docker-scout

Server: Containers: 1 Running: 1 Paused: 0 Stopped: 0 Images: 57 Server Version: 27.3.1 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: 2 Plugins: Volume: local Network: bridge host ipvlan macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog Swarm: inactive Runtimes: io.containerd.runc.v2 runc Default Runtime: runc Init Binary: docker-init containerd version: 472731909fa34bd7bc9c087e4c27943f9835f111 runc version: v1.1.13-0-g58aa920 init version: de40ad0 Security Options: seccomp Profile: unconfined cgroupns Kernel Version: 6.10.11-linuxkit Operating System: Docker Desktop OSType: linux Architecture: aarch64 CPUs: 4 Total Memory: 11.67GiB Name: docker-desktop ID: 31c6a73d-4b64-4309-a72e-e197d14b06c1 Docker Root Dir: /var/lib/docker Debug Mode: false HTTP Proxy: http.docker.internal:3128 HTTPS Proxy: http.docker.internal:3128 No Proxy: hubproxy.docker.internal Labels: com.docker.desktop.address=unix:///Users/richard.moats/Library/Containers/com.docker.docker/Data/docker-cli.sock Experimental: true Insecure Registries: hubproxy.docker.internal:5555 127.0.0.0/8 Registry Mirrors: https://mirror.tangocard.io/ Live Restore Enabled: false

WARNING: daemon is not using the default seccomp profile

Diagnostics ID

7715A2E9-189F-406A-B363-C08F447CF458/20241028185123

Additional Info

No response

[richard-moats-tc]

Seems to affect Docker for Windows users as well: https://forums.docker.com/t/docker-listening-on-port-8888-after-latest-update-no-running-containers/144633

[panvid]

To solve this problem:

The update silently activate the Send usage statistics setting. This uses the port 8888.

Deactivate this in Docker Deskop settings:

https://forums.docker.com/t/docker-listening-on-port-8888-after-latest-update-no-running-containers/144633/4

[doringeman]

Hello,

Thank you for your report! We've identified and fixed the issues.

Here are the macOS builds for 4.35.1, soon to appear on https://docs.docker.com/desktop/release-notes/ as well. macOS amd64: https://desktop-stage.docker.com/mac/main/amd64/173168/Docker.dmg macOS arm64: https://desktop-stage.docker.com/mac/main/arm64/173168/Docker.dmg

Would you mind re-enabling "Send usage statistics" to test the patch and continue supporting our ongoing product improvement?

[NiklasBr]

After updating to 4.35.1 I am consistently getting these errors which I have never seen before:

Error response from daemon: network a479b377fb093119a935014f2be675c936e419d37edf872fccef8db93affb357 not found

Diagnostics: 39263439-8ED3-425A-A6C1-A4B1DD929F05/20241031141622

[richard-moats-tc]

Version 4.35.1 fixes my reported issue. I appreciate the responsiveness!