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What is BlockChain?
The BlockChain is a distributed database that maintains a continuously-growing list of ordered records called blocks. This technology underlying Bitcoin and other cryptocurrencies. It is a public ledger of all Bitcoin transaction. These blocks are added in a chronological order. In order to deploy a blockchain application, you need a distributed Hyperledger blockchain on your choice of infrastructure (on-premise or cloud). In this article, we will deploy a Hyperledger Fabric cluster using Kubernetes.Prerequisites for BlockChain Application Deployment
To follow this guide you need a system with working Kubernetes cluster on it. We will use Fabric which is an implementation of blockchain technology written in Golang so go version go1.6.2 or above is required. Before proceeding further let’s have a look on Hyperledger Fabric.The Hyperledger Project
Hyperledger is an open source project with collaborative effort created to advance blockchain technology. It helps in cross-industry distributed ledgers which support transaction system, property transaction, and other services.Hyperledger Fabric
The Fabric is an implementation of blockchain technology. It provides a modular architecture allowing pluggable implementations of the various function.Hyperledger Kubernetes Replication Controller
We will launch hyperledger on kubernetes as a Replication Controller it will ensure us the high - availability of hyperledger pods. Create a file named membersrvc-rc.yml.
apiVersion: v1
kind: ReplicationController
metadata:
creationTimestamp: null
labels:
service: membersrvc
name: membersrvc
namespace: default
spec:
replicas: 1
selector:
service: membersrvc
template:
metadata:
creationTimestamp: null
labels:
service: membersrvc
spec:
containers:
-command:
-membersrvc
image: hyperledger / fabric - membersrvc
imagePullPolicy: ""
name: membersrvc
ports:
-containerPort: 7054
resources: {}
restartPolicy: Always
serviceAccountName: ""
volumes: null
status:
replicas: 0
apiVersion: v1
kind: ReplicationController
metadata:
creationTimestamp: null
labels:
service: vp0
name: vp0
namespace: $ {
NAMESPACE
}
spec:
replicas: 1
selector:
service: vp0
template:
metadata:
creationTimestamp: null
labels:
service: vp0
spec:
containers:
-command:
-sh - -c - sleep 5;
peer node start--peer - chaincodedev
env:
-name: CORE_PEER_ADDRESSAUTODETECT
value: "true" - name: CORE_VM_ENDPOINT
value: unix: ///var/run/docker.sock
-name: CORE_LOGGING_LEVEL
value: DEBUG - name: CORE_PEER_ID
value: vp0 - name: CORE_PEER_PKI_ECA_PADDR
value: membersrvc: 7054 - name: CORE_PEER_PKI_TCA_PADDR
value: membersrvc: 7054 - name: CORE_PEER_PKI_TLSCA_PADDR
value: membersrvc: 7054 - name: CORE_SECURITY_ENABLED
value: "false" - name: CORE_SECURITY_ENROLLID
value: test_vp0 - name: CORE_SECURITY_ENROLLSECRET
value: MwYpmSRjupbT
image: hyperledger / fabric - peer
imagePullPolicy: ""
name: vp0
ports:
-containerPort: 7050 - containerPort: 7051 - containerPort: 7053
resources: {}
restartPolicy: Always
serviceAccountName: ""
volumes: null
status:
replicas: 0
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
name: membersrvc
namespace: default
spec:
ports:
-name: ""
nodePort: 0
port: 7054
protocol: ""
targetPort: 0
selector:
service: membersrvc
status:
loadBalancer: {}
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
name: vp0
namespace: default
spec:
type: NodePort
ports:
-name: "port1"
port: 7050
protocol: ""
targetPort: 0 - name: "port2"
nodePort: 0
port: 7051
protocol: ""
targetPort: 0 - name: "port3"
nodePort: 0
port: 7053
protocol: ""
targetPort: 0
selector:
service: vp0
status:
loadBalancer: {}
Running Hyperledger Pods
After creating all the necessary file, next step is to start these rc pods $ kubectl create -f membersrvc-rc.yml $ kubectl create -f vp0-rc.yml
Running Hyperledger Services for Blockchain Deployment
Now start the service for hyperledger $ kubectl create -f membersrvc-srv.yml $ kubectl create -f vp0-srv.yml
Running the ChainCode
Before running ChainCode you need to set your $GOPATH and then make a directory to download the sample ChainCode in the src directory.
mkdir - p $GOPATH / src / github.com / chaincode_example02 /
cd $GOPATH / src / github.com / chaincode_example02
Curl--request GET https: //raw.githubusercontent.com/hyperledger/fabric/master/examples/chaincode/go/chaincode_example02/chaincode_example02.go > chaincode_example02.go
mkdir - p $GOPATH / src / github.com / hyperledger
cd $GOPATH / src / github.com / hyperledger
git clone http: //gerrit.hyperledger.org/r/fabric
cd $GOPATH / src / github.com / chaincode_example02
go build
Starting and registering the ChainCode
Run the following command to start the ChainCode.
CORE_CHAINCODE_ID_NAME = mycc CORE_PEER_ADDRESS = 0.0 .0 .0: 7051. / chaincode_example02
Running Rest API
To log in with the help of REST API, send a POST request to the /registrar endpoint, with the enrollmentID and enrollmentPW. These parameters are listed in the eca.users section of the membersrvc.yaml file. REST Request:
POST localhost: 7050 / registrar {
"enrollId": "jim",
"enrollSecret": "6avZQLwcUe9b"
}
200 OK {
"OK": "Login successful for user 'jim'."
}
REST Request:
POST / chaincode
{
"jsonrpc": "2.0",
"method": "deploy",
"params": {
"type": 1,
"chaincodeID": {
"name": "mycc"
},
"ctorMsg": {
"args": ["init", "a", "100", "b", "200"]
}
},
"id": 1
}
{
"jsonrpc": "2.0",
"result": {
"status": "OK",
"message": "mycc"
},
"id": 1
}
You can also track the events on the console also. 
Summarizing BlockChain Application Deployment
BlockChains can support the creation of new, more efficient business processes. Now as you understand the basic fundamentals of BlockChain Technology, you need to decide whether BlockChain fits your needs or not. There will be a rush to develop new decentralized apps so as to enable the decentralized world that we are moving towards. Considering this fact, Business Leaders need to learn a new vocabulary around crypto-related frameworks. Developers need to learn how to write decentralized apps that are enabled by BlockChain Technology. And End Users need to learn how to create or use smart contracts, e.g. as depicted via the Mist browser vision (Ethereum), which is a mix of marketplace discovery, management dashboard, and creation platform, all-in-one. You can also explore more about Serverless and Microservices for Blockchain in this blog.
What's Next?
- BlockChain App Development with Serverless and Microservices
- Enterprise Kubernetes Consulting Services for Modernizing Application
- Blockchain Technology and Development Solutions
Consult with our Blockchain Strategy and Consulting Specialist for an Expert Advice
