What is a containerd snapshotter?

• containerd

  125 16,259 9.9 Go

  An open and reliable container runtime

  

Side note: the Target field was recently added (Feb 2023 circa) as an optional field to the struct. The snapshotters currently baked in containerd do not use/do not need it so for now/rest of the document we will just say that the field was added because some future snapshotters might need it. The github issue and PR contain more details on the reasoning

• soci-snapshotter

  6 455 9.1 Go

  A containerd snapshotter plugin which enables standard OCI images to be lazily loaded without requiring a build-time conversion step.

  

This behavior allows us to set up snapshots out of band, that is outside the "normal" workflow. One such example is the soci snapshotter which allows image lazy loading. The snapshotter ships with a "rpull" command which performs this out of band prep. During rpull, the command calls the soci snapshotter which creates fuse mounts for each layer that has an index (remote snapshot). For layers that do not have an index, it downloads them as usual (local snapshot). The local snapshot is created with overlay mount. Anyway, this is just a detail, the important bit is that folders created for a local snapshot only contain that layer, which is exactly what overlay does. For example, after rpull we'll see something like the following:

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

Suggest a related project