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docs(admin): configure containerd data root to /data [skip ci] #138

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Merged
rfay merged 1 commit into from
May 8, 2026
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docs(admin): configure containerd data root to /data [skip ci] #138

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8 changes: 8 additions & 0 deletions docs/admin/server-setup.md
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Expand Up @@ -189,8 +189,16 @@ sudo tee /etc/docker/daemon.json > /dev/null <<'EOF'
}
EOF

# Configure containerd to use /data as well.
# containerd runs as a separate daemon from Docker and has its own data root
# (default: /var/lib/containerd). Without this, /var fills up with image snapshots.
sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml > /dev/null
sudo sed -i 's|^root = .*|root = "/data/containerd"|' /etc/containerd/config.toml

# Verify
docker --version
sudo systemctl enable --now containerd
sudo systemctl enable --now docker
```

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14 changes: 14 additions & 0 deletions docs/admin/troubleshooting.md
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Expand Up @@ -857,6 +857,20 @@ du -sh /coder-workspaces/* | sort -h
# Delete unused workspaces
```

**/var partition full (containerd not in /data):**

containerd runs as a daemon separate from Docker and has its own data root (`/var/lib/containerd` by default). If the server was set up without configuring containerd's root, image snapshots accumulate in `/var` rather than `/data`. Fix:

```bash
sudo systemctl stop docker containerd
sudo mv /var/lib/containerd /data/containerd
sudo sed -i 's|^root = .*|root = "/data/containerd"|' /etc/containerd/config.toml
sudo systemctl start containerd && sudo systemctl start docker
docker ps # verify healthy
```

New server setups should configure containerd's root during initial setup — see `server-setup.md`.

## Getting Help

### Information to Collect
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