The Cello system is suggested to be deployed on multiple servers, at least 1 Master Node + 1 Worker Node.

  • Master Node: Running Cello services, which will manage the worker nodes.
  • Worker Node: The servers to have blockchains running inside. The worker nodes will be managed by the master node.
  • Host: Host is a resource pool managed by a unique control point, which consists of several compute nodes. Typically it can be a naive Docker host, a Swarm cluster or other bare-metal/virtual/container clusters.
  • Chain (Cluster): A blockchain network including numbers of peer nodes. E.g., a Hyperledger Fabric network, a SawthoothLake or Iroha chain.


The Master Node will hold the main Cello services.

This node is the control point of the whole Cello cluster, and most of the management work should be taken here.

Master node will manage the blockchain networks running inside the Worker nodes.


Worker nodes will be managed by the Host's control service, and hold the blockchains.


A host is a group of worker nodes managed by the same resource controller, which can be a native Docker Host or a Swarm Cluster currently.

Usually a host has several properties:

  • Name: Alias name for human read convenience.
  • Daemon URL: The url for Docker/Swarm Access.
  • Capacity: How many chains the host can have at most.
  • Logging Level: The default logging level for the chains at this host.
  • Logging Type: How to handle those logging messages.
  • Schedulable: The chains on this hosts are available to be scheduled to users.
  • Autofill: Always automatically fill the hosts full with chains.


A chain is typically a blockchain cluster, e.g., a fabric network.

A Chain has several properties:

  • Name: Alias name for human readiness.
  • Host: Which host the chain locates.
  • Size: How number nodes does the chain have.
  • Consensus: What kind of consensus does the chain adopts, depending on the blockchain technology.

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