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[regression in Docker 20.10.6] slirp4netns port driver fails: "Timed out proxy starting the userland proxy." #250

Description

@AkihiroSuda

Rootless Docker 20.10.6 + RootlessKit v0.14.1 + slirp4netns port driver fails

$ cat ~/.config/systemd/user/docker.service.d/override.conf 
[Service]
Environment=DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER="slirp4netns"

$ docker --context=rootless run --rm -p 8080:80 nginx:alpine
docker: Error response from daemon: driver failed programming external connectivity on endpoint dreamy_gauss (93092ec62bc18d4190f18c05f188505c11acce4feef7ea2eb259805c18edfd85): Timed out proxy starting the userland proxy.

The builtin port driver with slirp4netns network driver works.

The both drivers were working with Docker v20.10.5.

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