Blockchain, Hyperledger fabric & Hyperledger cello
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The document discusses the features and architecture of Hyperledger Fabric, highlighting its modular design that allows for customizable components and smart contracts, known as chaincode. It describes practical deployment processes using Ansible for creating and managing Fabric networks on various cloud platforms. Additionally, the document explains basic operations on the blockchain, such as querying and invoking transactions.
![Operation on blockchain
• Start the tool container so that we have environment to run peer cli
commands, we will be doing on one of the nodes since we will need
to have
– docker exec -it k8s_peer1st-orgaxxxx bash
• Query
– peer chaincode query -C firstchannel -n firstchaincode -c
'{"Args":["query","a"]}'
• Do transcation:
– peer chaincode invoke -C firstchannel -n firstchaincode -c
'{"Args":["invoke","a","b","10"]}’
12](https://image.slidesharecdn.com/blockchaink8stongli-171202224211/85/Blockchain-Hyperledger-fabric-Hyperledger-cello-12-320.jpg)
Blockchain, Hyperledger fabric & Hyperledger cello
- 1. Blockchain, Hyperledger fabric & Hyperledger cello Tong Li, Senior Software Engineer at IBM #email4tong litong01@us.ibm.com
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- 3. Why does blockchain system (network) stand out from others? • Decentralized • Consensus – Proof of work – Proof of stake • Immutable • Public 3
- 4. Blockchains • Bitcoin – https://blockchain.info/ – https://blockchain.info/unconfirmed-transactions • Etherum – https://ethstats.net/ 4
- 5. 5 A smart contract is a computer protocol intended to facilitate, verify, or enforce the negotiation or performance of a contract. Smart contracts were first proposed by Nick Szabo in 1996 -- Wikipedia
- 6. Hyperledger Fabric is a blockchain framework implementation and one of the Hyperledger projects hosted by The Linux Foundation. Intended as a foundation for developing applications or solutions with a modular architecture, Hyperledger Fabric allows components, such as consensus and membership services, to be plug-and-play. Hyperledger Fabric leverages container technology to host smart contracts called “chaincode” that comprise the application logic of the system. Hyperledger Fabric was initially contributed by Digital Asset and IBM 6
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- 8. • Transactions contents are protected, only permitted people can see the contents of the transactions from transactions entering the system to living in the system. • Consensus algorithm, energy saving and faster consensus, pluggable methods, Solo, Kafka, PBFT. • Components are completely (docker) containerized. Part of reason why k8s is a good fit for running Hyperledger fabric. 8
- 9. • Use battle tested tool (Ansible) • Complete automation • Repeatable • Cloud first, network services dns & container registrator • Dev, test and production consistent • Full configurable fabric network topology • From zero to fully functional fabric network • Run all plays, one play or some plays as you wish for dev https://github.com/hyperledger/cello/src/agent/ansible 9
- 10. Fabric Deploy – How does it work? • Use Ansible playbooks • Use Ansible cloud modules (OpenStack, AWS, Azure) to provision Virtual Machines on different cloud • Convenient top level playbooks for typical deploy scenarios • Three steps to achieve the goal – Provision (OS, VB, AWS, Azure now, Bluemix, softlayer later) – Prepare nodes (Dependencies, Overlay Network or K8S, DNS, Registrator) – Build and deploy • build from source or draw from docker hub • Certificate generation • Deploy onto one node or multiple nodes 10
- 11. • Two node Hyperledger fabric network on my laptop • Three node Hyperledger fabric network on AWS 11
- 12. Operation on blockchain • Start the tool container so that we have environment to run peer cli commands, we will be doing on one of the nodes since we will need to have – docker exec -it k8s_peer1st-orgaxxxx bash • Query – peer chaincode query -C firstchannel -n firstchaincode -c '{"Args":["query","a"]}' • Do transcation: – peer chaincode invoke -C firstchannel -n firstchaincode -c '{"Args":["invoke","a","b","10"]}’ 12
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Editor's Notes
- #3: Blockchain is a time-stamped, non-repudiable database that contains the entire logged history of the system. It is normally a huge database, a distributed system, sometimes, people simply call such system a network. Each node on the network will have complete data, it is very different from the traditional distributed database which normally has pieces of the completely data, all the nodes combined will provide the complete data, but blockchain node each maintains the complete data in its chain.
- #4: Peer to peer network, everyone is a client, every one is a server