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Run a Container with Persistent Storage
Attaches a named volume so the data survives removing and recreating the container.
Without a volume, everything a container writes lives in its writable layer and disappears with docker rm. A named volume is managed by Docker; a bind mount (-v /host/path:/container/path) maps a directory you already have.
When you need this: Any container holding state: a database, uploads, or a configuration directory.
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