nbdkit filters

nbdkit is our toolkit for creating Network Block Device (NBD) servers from “unusual” data sources. nbdkit was already configurable by writing simple plugins in several programming languages. Last week Eric Blake and I added a nice new feature: You can now modify existing plugins by placing “filters” in front of them.

A plugin might do something simple like serve a local file from disk or complicated like bridging to VMware servers. A filter can modify this by:

(You can also layer filters to arbitrary depth)

nbdkit 1.1.27 has three simple filters, and 1.1.28 will include two more, and you can write your own although (unlike plugins) filters do not yet have a stable ABI and we haven’t decided if we will offer a stable ABI in future.

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