⛓️Channel Creation

Here we will understand the Confixtx.yaml file and learn how to create channel.

Create Channel

1. Set the Config Path

export PATH=${PWD}/../bin:${PWD}:$PATH
export FABRIC_CFG_PATH=${PWD}/configtx
export CHANNEL_NAME=mychannel

2. Create the System Genesis Block and Channel Genesis block

configtxgen -profile TwoOrgsApplicationGenesis -outputBlock ./channel-artifacts/${CHANNEL_NAME}.block -channelID $CHANNEL_NAME

3. Convert Block to JSON format to understand the data inside it.

configtxgen -inspectBlock ./channel-artifacts/mychannel.block > dump.json

4. Copy some prerequisites

cp ../config/core.yaml ./configtx/.

5. Create the Channel

Let's Export the Environment variables to provide Orderer access to our terminal.

export ORDERER_CA=${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem
export ORDERER_ADMIN_TLS_SIGN_CERT=${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/tls/server.crt
export ORDERER_ADMIN_TLS_PRIVATE_KEY=${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/tls/server.key

Let's create a channel using "OSNADMIN" binary file.

osnadmin channel join --channel-id $CHANNEL_NAME --config-block ./channel-artifacts/${CHANNEL_NAME}.block -o localhost:7053 --ca-file "$ORDERER_CA" --client-cert "$ORDERER_ADMIN_TLS_SIGN_CERT" --client-key "$ORDERER_ADMIN_TLS_PRIVATE_KEY"

6. Join the Organizational peers in the channel

First Let's join Org1 Peer.

To join the channel, our terminal needs access to peer, for that let's write a script which will set the environment variables.

Script Name: setOrgPeerContext.sh

#!/bin/bash

# import utils
source scripts/envVar.sh

ORG=$1

setGlobals $ORG

Now let's source the script.

source ./scripts/setOrgPeerContext.sh 1

Let's join the peer now

peer channel join -b ./channel-artifacts/mychannel.block

Join Org2 Peer Now

source ./scripts/setOrgPeerContext.sh 2
peer channel join -b ./channel-artifacts/mychannel.block

7. Update Anchor peer for Org1

source ./scripts/setOrgPeerContext.sh 1
docker exec cli ./scripts/setAnchorPeer.sh 1 $CHANNEL_NAME

8. Update Anchor peer for Org2

source ./scripts/setOrgPeerContext.sh 2
docker exec cli ./scripts/setAnchorPeer.sh 2 $CHANNEL_NAME

That's it!