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問題

在 Windows 的 WSL Ubuntu 安裝完 Docker 時無法啟動 docker，跑出下列的訊息

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.

解法

A. 重新啟動 Docker 系統服務

systemctl start docker
gpasswd -a $USER docker

B. 手動啟動 Docker 服務

sudo dockerd

原因是 Docker 服務沒有被啟動，只要將服務重新啟動即可使用 Docker!

Reference

• linux - Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running? - Stack Overflow
• Install Docker Engine on Ubuntu | Docker Documentation

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