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What is the VOLUME instruction good for in Docker?

Experience Level: Senior
Tags: Docker

Answer

The VOLUME instruction creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers. The value can be a JSON array, VOLUME ["/var/log/"], or a plain string with multiple arguments, such as VOLUME /var/log or VOLUME /var/log /var/db.

Example:
FROM ubuntu
VOLUME /myvol

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