Fabric Network with Kafka

A fully automated way to setup Hyperledger Fabric Network with Kafka Consensus on Kubernetes.

Introduction

The Hyperledger Fabric has introduced Kafka as it’s primary consensus mechanism among the orderers. While in development, for testing purposes, a solo config orderer is used. However, in production, you need to have multiple orderer nodes set up to have fail proof systems.

Network Topology

A simple Fabric network configuration:

• 2 CAs, 1 for each orgs
• 2 CLI, 1 for each orgs
• 3 Orderers
• 2 Organizations
• 4 peers, 2 for each orgs
• 4 Kafka broker instances
• 3 Zookeeper instances

How to Use

Prerequisites

• A single node K8S cluster bootstrapped by kubeadmin
• git is installed
• kubectl is installed

Note: The automation scripts are only working on a single node kubernetes cluster, since dynamic storage provisioning is not configured by default. Required persistent volumes are created by the script setupNetwork.sh.

Setup Fabric Netowrk

1. Clone the repository

$ git clone https://github.com/xmhubj/fabric-kafka.git

2. Change directory

$ cd fabric-kafka

3. Run the setupNetwork.sh

$ ./setupNetwork.sh

Please check the output of the above script, make sure no errors observed.

Verify the Fabric Network

There are two additional deployments called cli added to the Fabric network, for debugging or testing purpose.

• Enter the cli container

$ kubectl exec -it cli-74bb65d9b7-r8c8d -n org1 bash

• Query the value of a, which should be the initial value 100

$ peer chaincode query -C mychannel -n cc -c '{"Args":["query","a"]}'

• Execute action invoke, which will transfer 10 from a to b

$ peer chaincode invoke -o orderer0.ordererorg1:7050   -C mychannel -n cc -c '{"Args":["invoke","a","b","10"]}'

• Verify the value of a, which should be 90 aftering

$ peer chaincode query -C mychannel -n cc -c '{"Args":["query","a"]}'
2018-08-27 04:09:00.475 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-08-27 04:09:00.475 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-08-27 04:09:00.475 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-08-27 04:09:00.475 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-08-27 04:09:00.475 UTC [chaincodeCmd] getChaincodeSpec -> DEBU 005 java chaincode disabled
2018-08-27 04:09:00.476 UTC [msp/identity] Sign -> DEBU 006 Sign: plaintext: 0A90070A6508031A0C08DCF28DDC0510...120263631A0A0A0571756572790A0161
2018-08-27 04:09:00.476 UTC [msp/identity] Sign -> DEBU 007 Sign: digest: C877E295D35A8229D66266C24310EC2BE717B7097386C953F36CE818A9879643
Query Result: 90
2018-08-27 04:09:00.497 UTC [main] main -> INFO 008 Exiting.....

Delete the Fabric Network

$ ./deleteNetwork.sh

References

• hyperledger/fabric

• hainingzhang/articles

• IBM/blockchain-network-on-kubernetes