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OneLineDev
OneLineDev

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Fix: 'permission denied while trying to connect to the Docker daemon socket' on Linux

#docker #linux #devops #programming

The Error

You run docker ps or docker compose up on Linux and get hit with:

permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock
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Why It Happens

The Docker daemon runs as root and binds to a Unix socket owned by the docker group. If your current user account has not been added to that group, the operating system blocks access.

⚡ The Instant Fix (One-Liner)

Add your current user to the docker group and refresh your group membership immediately without logging out:

sudo usermod -aG docker $USER && newgrp docker
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Verify it works without sudo:

docker ps
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If the Docker Service Isn't Running

If you still get socket errors, ensure the Docker engine daemon is actively running:

sudo systemctl enable --now docker
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Check status:

sudo systemctl status docker
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WSL2 (Ubuntu on Windows) Fix

If you are running Docker inside WSL2 without Docker Desktop:

sudo service docker start
sudo usermod -aG docker $USER && newgrp docker
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⚠️ What NOT to Do

Never run sudo chmod 777 /var/run/docker.sock. While it works temporarily, it gives every user and malicious process on your machine unrestricted root privileges to your host system.

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