When deploying an Orderer environment, variables must be customized or overridden in which artifact?
When deploying an Orderer environment in Hyperledger Fabric, the primary configuration file that must be customized or overridden is orderer.yaml. This file contains the configuration settings specifically for the orderer node, including general ledger type, consensus type, and various operational settings like batching, timeouts, and MSP configurations. Other files like crypto-config.yaml, docker-compose.yaml, and configtx.yaml serve different roles. crypto-config.yaml is used for generating cryptographic material, docker-compose.yaml for defining services, networks, and volumes for containers, and configtx.yaml for channel configuration and consortium definitions. Therefore, orderer.yaml is critical for setting up the orderer's behavior and parameters in the network environment.
In Hyperledger Fabric a transaction is initiated where?
In Hyperledger Fabric, a transaction is initiated by a client application. The client creates a transaction proposal and sends it to endorsing peers. The role of the client is critical as it acts as the initiator of transactions, constructing and proposing transactions to the network for endorsement and then submitting the endorsed transactions to the ordering service for inclusion in the blockchain. The client essentially orchestrates the process of transaction creation, endorsement, and submission, starting the entire transaction flow.
How should private data collection be configured and deployed?
In Hyperledger Fabric, private data collections are configured using a separate JSON file that describes the details of the collection, such as the name, policy, and member organizations that have access to it. This configuration file is included during the chaincode deployment process. The collections configuration file defines how private data is managed, including its lifecycle, storage, and dissemination between authorized peers. By configuring private data collections in this manner, organizations ensure that sensitive information is only accessible to specific participants in the network, thus maintaining confidentiality and compliance with data governance standards.
Which of the following information do signature policies provide when creating a network in Hyperledger Fabric?
In Hyperledger Fabric, signature policies specify the identities of specific users who must sign a transaction for it to be considered valid. These policies define the endorsement rules associated with a chaincode and are a critical component of the transaction flow. They ensure that transactions are endorsed by the correct entities as stipulated by the governance of the network. Signature policies are not related to the number of nodes, private keys of participants, or the type of consensus algorithm used but are strictly about defining which users or member organizations' signatures are required to fulfill transaction criteria.
In Raft, there are two places for configuration. One is local configuration. What is the other?
In Raft, configuration occurs at two levels: local and channel. The local configuration pertains to node-specific settings such as TLS communication and file storage. The channel configuration, on the other hand, defines the membership and operational parameters of the Raft cluster for a specific channel, including settings like heartbeat frequency and leader timeouts. This dual-level configuration allows for precise control over the behavior of Raft nodes within the Hyperledger Fabric network .
