Kraken Core

Central P2P components that's not specific to docker images:

Agent

• Deployed on every host
• Implements Docker registry interface

Origin

• Dedicated seeders
• Pluggable storage backend (e.g. S3)
• Self-healing hash ring

Tracker

• Tracks peers and seeders, instructs them to form a sparse graph
• Self-healing hash ring

Kraken Proxy and Build Index

Components responsible for image tags and replication to other clusters:

Proxy

• Handles image upload and direct download

Build Index

• Mapping of human readable tag to blob hash (digest)
• No consistency guarantees, client should use unique tags
• Powers image replication between clusters. Simple duplicated queues with retry
• Pluggable storage
• Self-healing hash ring