How to use BYFN CLI "peer" Command Prefix?

By default, when you run the "peer" command on the BYFN CLI container, it will be executed again the default peer node specified by 4 environment variables:

CORE_PEER_MSPCONFIGPATH=/opt/gopath/.../org1.example.com/users/Admin@org1.example.com/msp
CORE_PEER_ADDRESS=peer0.org1.example.com:7051
CORE_PEER_LOCALMSPID=Org1MSP
CORE_PEER_TLS_ROOTCERT_FILE=/opt/gopath/.../org2.example.com/peers/peer0.org1.example.com/tls/ca.crt

If you want to switch to different peer node, you have to re-define those 4 variables, which takes 4 commands to do.

Another quick solution is to prefix the "peer" command to override those variables. For example, the following command list installed chaincodes on peer0.org2 peer node, not the default peer node.

1. Connect to the BYFN CLI container and check the default peer:

$ docker exec -it cli bash

bash-4.4# echo $CORE_PEER_ADDRESS
peer0.org2.example.com:7051

2. Run "peer" command on default peer, peer0.org1:

bash-4.4# peer node status
status:STARTED

1. Run "peer" command on peer0.org2:

bash-4.4# CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger\
   /fabric/peer/crypto/peerOrganizations/org2.example.com/users\
   /Admin@org2.example.com/msp CORE_PEER_ADDRESS=peer0.org2.example.com:7051 \
   CORE_PEER_LOCALMSPID=Org2MSP CORE_PEER_TLS_ROOTCERT_FILE=/opt/gopath/src\
   /github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com\
   /peers/peer0.org2.example.com/tls/ca.crt \
   peer node status

status:STARTED

2. Run "peer" command on pee0.org2:

bash-4.4# CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger\
   /fabric/peer/crypto/peerOrganizations/org2.example.com/users\
   /Admin@org2.example.com/msp CORE_PEER_ADDRESS=peer0.org2.example.com:7051 \
   CORE_PEER_LOCALMSPID=Org2MSP CORE_PEER_TLS_ROOTCERT_FILE=/opt/gopath/src\
   /github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com\
   /peers/peer0.org2.example.com/tls/ca.crt \
   peer node status

status:STARTED

⇒ Incompatible Chaincode on BYFN Peers

⇐ Invoke Chaincode Transaction on BYFN Channel

⇑ BYFN (Build Your First Network)

⇑⇑ Hyperledger Tutorials