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docs: clarify Docker install — add docker.io fallback, warn against bare apt install docker-ce

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https://claude.ai/code/session_01FKCW3FDjNFj6jve4niMFXH
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Claude 2026-03-19 14:10:27 +00:00
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docs/setup.md
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@ -111,8 +111,25 @@ sudo systemctl enable fail2ban --now
## 5. Install Docker ## 5. Install Docker
> **Note:** Do **not** run `apt install docker-ce` directly — that package
> requires Docker's own apt repository to be added first.
> Use one of the two methods below.
**Option A — Official convenience script (recommended, installs latest Docker CE):**
```bash ```bash
curl -fsSL https://get.docker.com | sh curl -fsSL https://get.docker.com | sh
```
**Option B — Debian-packaged `docker.io` (older but simpler, no extra repo needed):**
```bash
sudo apt install -y docker.io
```
Then, regardless of which option you used:
```bash
sudo usermod -aG docker pi # allow running docker without sudo sudo usermod -aG docker pi # allow running docker without sudo
newgrp docker # apply group without logging out newgrp docker # apply group without logging out
docker run --rm hello-world # verify docker run --rm hello-world # verify