containerd

Documentation

Index

• func NewBlobStore(db *bolt.DB) *blobStore
• func NewExplorer(imageroot string, root string, manifest string, snapshot string, ...) (explorers.ContainerExplorer, error)
• func NewSnaptshotStore(root string, db *bolt.DB, sdb *bolt.DB) *snapshotStore

Functions

func NewBlobStore

func NewBlobStore(db *bolt.DB) *blobStore

NewBlobStore returns blob store used for content operation

In containerd, content information is stored in metadata file meta.db. i.e. meta.db/v1/<namespace>/content/blob/<blob digest>

func NewExplorer

func NewExplorer(imageroot string, root string, manifest string, snapshot string, sc *explorers.SupportContainer) (explorers.ContainerExplorer, error)

NewExplorer returns a ContainerExplorer interface to explore containerd.

func NewSnaptshotStore

func NewSnaptshotStore(root string, db *bolt.DB, sdb *bolt.DB) *snapshotStore

NewSnapshotStore returns snapshotStore which handles viewing of snapshot information

In containerd, snapshot information is stored in metadata file meta.db and snapshot database file metadata.db.

The meta.db file contains the following information:

• Container reference to container snapshot: meta.db/v1/<namespace>/containers/<container id>
• shapshotter
• snapshotKey
• Snapshot information in meta.db/v1/<namespace>/snapshots/<snapshotter>/<snapshot key>

The metadata.db file contains additional information about a snapshot. Snapshot path in snapshot database: metadata.db/v1/snapshots/<snapshot key>

• id - Snapshot file system ID i.e. /var/lib/containerd/io.containerd.snapshotter.v1.overlayfs/snapshots/<id>/fs
• kind - ACTIVE vs COMMITTED