Running Dockerfile.slim with a fresh named volume crashed on startup:
[NODE] open chain: open badger: Error Creating Dir: "/data/chain"
error: mkdir /data/chain: permission denied
Docker copies the mount-point's directory ownership (from the image)
into a new named volume at first attach. In the previous Dockerfile
/data was created implicitly by the VOLUME directive, which means it
was owned by root — but the container runs as the unprivileged
`dchain` user, so it couldn't `mkdir /data/chain` on first boot.
Fix: explicitly `mkdir /data && chown dchain:dchain /data` in the
same RUN that creates the user, before the VOLUME directive. Fresh
volumes now inherit dchain:dchain ownership automatically; no
operator-side `docker run --user root chown` workaround needed.
Operators already running with a root-owned volume from before this
fix need to chown once manually:
docker run --rm -v dchain_data:/data --user root alpine \
sh -c 'chown -R 100:101 /data'
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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