Automation & Scripting Flashcards

Which tool and flag combination generates a channel genesis block from configtx.yaml in Fabric 2.3+ without a system channel?

Answer: configtxgen -profile -outputBlock -channelID

configtxgen with -outputBlock builds the channel genesis block that is then joined using osnadmin.

Which command joins an orderer to a channel using the Orderer admin API in a Fabric 2.4+ script?

Answer: osnadmin channel join --channelID --config-block --orderer-address

osnadmin channel join calls the orderer's admin endpoint with the channel config block.

When scripting peer CLI calls as a different organization, which environment variable sets the MSP ID the peer CLI presents?

Answer: CORE_PEER_LOCALMSPID

CORE_PEER_LOCALMSPID identifies the MSP of the identity used by the CLI.

What is the intended use of the cryptogen tool?

Answer: Generating static crypto material for development and testing only

cryptogen creates fixed certificates for dev/test, while production should use Fabric CA or an enterprise CA.

Which environment variable tells Fabric binaries where to find core.yaml, configtx.yaml or orderer.yaml?

Answer: FABRIC_CFG_PATH

FABRIC_CFG_PATH points the binaries at the directory holding their configuration files.

Which tool converts a channel config block between protobuf and JSON for scripted config updates?

Answer: configtxlator

configtxlator proto_decode and proto_encode translate configuration between binary and JSON forms.

A script needs to check which chaincode packages are installed on a peer and obtain the package ID. Which command does this?

Answer: peer lifecycle chaincode queryinstalled

queryinstalled lists installed packages with their package IDs and labels.