Ubuntu 20.04 (WSL) に Dockerをインストール

$ sudo apt -y install apt-transport-https ca-certificates curl software-properties-common

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -a

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

$ sudo apt update
$ sudo apt -y install docker-ce
$ sudo usermod -a -G docker ${USER}

サービスは起動している

$ sudo systemctl status docker
● docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2023-02-04 15:16:59 JST; 50s ago
TriggeredBy: ● docker.socket
       Docs: https://docs.docker.com
   Main PID: 2825 (dockerd)
      Tasks: 16
     Memory: 32.8M
     CGroup: /system.slice/docker.service
             └─2825 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

直後は docker image ls が実行できない

$ docker image ls
permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/images/json": dial unix /var/run/docker.sock: connect: permission denied

rootだとOK

$ sudo docker image ls
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE

shell を再起動してから行ったらOKでした。

$ docker image ls
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE