Add new channel to existing Hyperledger Fabric network

Question

I have a 3 organisations hyperledger fabric. I have already created a channel for 3 orgs(all) and network is running. Also smart contract is installed on that channel. Now I want to create 2 more channels in existing network. One for Org1-Org2, second for Org1-Org3. Kindly help me with some documentation or steps to perform operation.

my configtx.yaml

# Copyright IBM Corp. All Rights Reserved.
#
# SPDX-License-Identifier: Apache-2.0
#

---
################################################################################
#
#   Section: Organizations
#
#   - This section defines the different organizational identities which will
#   be referenced later in the configuration.
#
################################################################################
Organizations:

    # SampleOrg defines an MSP using the sampleconfig.  It should never be used
    # in production but may be used as a template for other definitions
    - &OrdererOrg
        # DefaultOrg defines the organization which is used in the sampleconfig
        # of the fabric.git development environment
        Name: OrdererOrg

        # ID to load the MSP definition as
        ID: OrdererMSP

        # MSPDir is the filesystem path which contains the MSP configuration
        MSPDir: ../organizations/ordererOrganizations/example.com/msp

        # Policies defines the set of policies at this level of the config tree
        # For organization policies, their canonical path is usually
        #   /Channel/<Application|Orderer>/<OrgName>/<PolicyName>
        Policies:
            Readers:
                Type: Signature
                Rule: "OR('OrdererMSP.member')"
            Writers:
                Type: Signature
                Rule: "OR('OrdererMSP.member')"
            Admins:
                Type: Signature
                Rule: "OR('OrdererMSP.admin')"
            Endorsement:
                Type: Signature
                Rule: "OR('OrdererMSP.member')"

        OrdererEndpoints:
            - orderer.example.com:7050

    - &Org1
        # DefaultOrg defines the organization which is used in the sampleconfig
        # of the fabric.git development environment
        Name: Org1MSP

        # ID to load the MSP definition as
        ID: Org1MSP

        MSPDir: ../organizations/peerOrganizations/org1.example.com/msp

        # Policies defines the set of policies at this level of the config tree
        # For organization policies, their canonical path is usually
        #   /Channel/<Application|Orderer>/<OrgName>/<PolicyName>
        Policies:
            Readers:
                Type: Signature
                Rule: "OR('Org1MSP.member')"
            Writers:
                Type: Signature
                Rule: "OR('Org1MSP.member')"
            Admins:
                Type: Signature
                Rule: "OR('Org1MSP.admin')"
            Endorsement:
                Type: Signature
                Rule: "OR('Org1MSP.peer')"

        # leave this flag set to true.
        AnchorPeers:
            # AnchorPeers defines the location of peers which can be used
            # for cross org gossip communication.  Note, this value is only
            # encoded in the genesis block in the Application section context
            - Host: peer0.org1.example.com
              Port: 7051

    - &Org2
        # DefaultOrg defines the organization which is used in the sampleconfig
        # of the fabric.git development environment
        Name: Org2MSP

        # ID to load the MSP definition as
        ID: Org2MSP

        MSPDir: ../organizations/peerOrganizations/org2.example.com/msp

        # Policies defines the set of policies at this level of the config tree
        # For organization policies, their canonical path is usually
        #   /Channel/<Application|Orderer>/<OrgName>/<PolicyName>
        Policies:
            Readers:
                Type: Signature
                Rule: "OR('Org2MSP.member')"
            Writers:
                Type: Signature
                Rule: "OR('Org2MSP.member')"
            Admins:
                Type: Signature
                Rule: "OR('Org2MSP.admin')"
            Endorsement:
                Type: Signature
                Rule: "OR('Org2MSP.peer')"

        AnchorPeers:
            # AnchorPeers defines the location of peers which can be used
            # for cross org gossip communication.  Note, this value is only
            # encoded in the genesis block in the Application section context
            - Host: peer0.org2.example.com
              Port: 9051

    - &Org3
        # DefaultOrg defines the organization which is used in the sampleconfig
        # of the fabric.git development environment
        Name: Org3MSP

        # ID to load the MSP definition as
        ID: Org3MSP

        MSPDir: ../organizations/peerOrganizations/org3.example.com/msp

        # Policies defines the set of policies at this level of the config tree
        # For organization policies, their canonical path is usually
        #   /Channel/<Application|Orderer>/<OrgName>/<PolicyName>
        Policies:
            Readers:
                Type: Signature
                Rule: "OR('Org3MSP.member')"
            Writers:
                Type: Signature
                Rule: "OR('Org3MSP.member')"
            Admins:
                Type: Signature
                Rule: "OR('Org3MSP.admin')"
            Endorsement:
                Type: Signature
                Rule: "OR('Org3MSP.peer')"

        AnchorPeers:
            # AnchorPeers defines the location of peers which can be used
            # for cross org gossip communication.  Note, this value is only
            # encoded in the genesis block in the Application section context
            - Host: peer0.org3.example.com
              Port: 11051


################################################################################
#
#   SECTION: Capabilities
#
#   - This section defines the capabilities of fabric network. This is a new
#   concept as of v1.1.0 and should not be utilized in mixed networks with
#   v1.0.x peers and orderers.  Capabilities define features which must be
#   present in a fabric binary for that binary to safely participate in the
#   fabric network.  For instance, if a new MSP type is added, newer binaries
#   might recognize and validate the signatures from this type, while older
#   binaries without this support would be unable to validate those
#   transactions.  This could lead to different versions of the fabric binaries
#   having different world states.  Instead, defining a capability for a channel
#   informs those binaries without this capability that they must cease
#   processing transactions until they have been upgraded.  For v1.0.x if any
#   capabilities are defined (including a map with all capabilities turned off)
#   then the v1.0.x peer will deliberately crash.
#
################################################################################
Capabilities:
    # Channel capabilities apply to both the orderers and the peers and must be
    # supported by both.
    # Set the value of the capability to true to require it.
    Channel: &ChannelCapabilities
        # V2_0 capability ensures that orderers and peers behave according
        # to v2.0 channel capabilities. Orderers and peers from
        # prior releases would behave in an incompatible way, and are therefore
        # not able to participate in channels at v2.0 capability.
        # Prior to enabling V2.0 channel capabilities, ensure that all
        # orderers and peers on a channel are at v2.0.0 or later.
        V2_0: true

    # Orderer capabilities apply only to the orderers, and may be safely
    # used with prior release peers.
    # Set the value of the capability to true to require it.
    Orderer: &OrdererCapabilities
        # V2_0 orderer capability ensures that orderers behave according
        # to v2.0 orderer capabilities. Orderers from
        # prior releases would behave in an incompatible way, and are therefore
        # not able to participate in channels at v2.0 orderer capability.
        # Prior to enabling V2.0 orderer capabilities, ensure that all
        # orderers on channel are at v2.0.0 or later.
        V2_0: true

    # Application capabilities apply only to the peer network, and may be safely
    # used with prior release orderers.
    # Set the value of the capability to true to require it.
    Application: &ApplicationCapabilities
        # V2_0 application capability ensures that peers behave according
        # to v2.0 application capabilities. Peers from
        # prior releases would behave in an incompatible way, and are therefore
        # not able to participate in channels at v2.0 application capability.
        # Prior to enabling V2.0 application capabilities, ensure that all
        # peers on channel are at v2.0.0 or later.
        V2_0: true

################################################################################
#
#   SECTION: Application
#
#   - This section defines the values to encode into a config transaction or
#   genesis block for application related parameters
#
################################################################################
Application: &ApplicationDefaults
    ACLs: &ACLsDefault
    
        # ACL policy for lscc's "getid" function
        lscc/ChaincodeExists: /Channel/Application/Readers

        # ACL policy for lscc's "getdepspec" function
        lscc/GetDeploymentSpec: /Channel/Application/Readers

        # ACL policy for lscc's "getccdata" function
        lscc/GetChaincodeData: /Channel/Application/Readers

        # ACL Policy for lscc's "getchaincodes" function
        lscc/GetInstantiatedChaincodes: /Channel/Application/Readers
        

        #---Query System Chaincode (qscc) function to policy mapping for access control---#

        # ACL policy for qscc's "GetChainInfo" function
        qscc/GetChainInfo: /Channel/Application/Readers
        

        # ACL policy for qscc's "GetBlockByNumber" function
        qscc/GetBlockByNumber: /Channel/Application/Readers

        # ACL policy for qscc's  "GetBlockByHash" function
        qscc/GetBlockByHash: /Channel/Application/Readers

        # ACL policy for qscc's "GetTransactionByID" function
        qscc/GetTransactionByID: /Channel/Application/Readers

        # ACL policy for qscc's "GetBlockByTxID" function
        qscc/GetBlockByTxID: /Channel/Application/Readers

        #---Configuration System Chaincode (cscc) function to policy mapping for access control---#

        # ACL policy for cscc's "GetConfigBlock" function
        cscc/GetConfigBlock: /Channel/Application/Readers

        # ACL policy for cscc's "GetConfigTree" function
        cscc/GetConfigTree: /Channel/Application/Readers

        # ACL policy for cscc's "SimulateConfigTreeUpdate" function
        cscc/SimulateConfigTreeUpdate: /Channel/Application/Readers

        #---Miscellanesous peer function to policy mapping for access control---#

        # ACL policy for invoking chaincodes on peer
        peer/Propose: /Channel/Application/Writers

        # ACL policy for chaincode to chaincode invocation
        peer/ChaincodeToChaincode: /Channel/Application/Readers

        #---Events resource to policy mapping for access control###---#

        # ACL policy for sending block events
        event/Block: /Channel/Application/Readers

        # ACL policy for sending filtered block events
        event/FilteredBlock: /Channel/Application/Readers

        # Chaincode Lifecycle Policies introduced in Fabric 2.x
        # ACL policy for _lifecycle's "CheckCommitReadiness" function
        _lifecycle/CheckCommitReadiness: /Channel/Application/Writers

        # ACL policy for _lifecycle's "CommitChaincodeDefinition" function
        _lifecycle/CommitChaincodeDefinition: /Channel/Application/Writers

        # ACL policy for _lifecycle's "QueryChaincodeDefinition" function
        _lifecycle/QueryChaincodeDefinition: /Channel/Application/Readers
    

    # Organizations is the list of orgs which are defined as participants on
    # the application side of the network
    Organizations:

    # Policies defines the set of policies at this level of the config tree
    # For Application policies, their canonical path is
    #   /Channel/Application/<PolicyName>
    Policies:
        Readers:
            Type: ImplicitMeta
            Rule: "ANY Readers"
        Writers:
            Type: ImplicitMeta
            Rule: "ANY Writers"
        Admins:
            Type: ImplicitMeta
            Rule: "MAJORITY Admins"
        LifecycleEndorsement:
            Type: ImplicitMeta
            Rule: "MAJORITY Endorsement"
        Endorsement:
            Type: ImplicitMeta
            Rule: "MAJORITY Endorsement"

    Capabilities:
        <<: *ApplicationCapabilities
################################################################################
#
#   SECTION: Orderer
#
#   - This section defines the values to encode into a config transaction or
#   genesis block for orderer related parameters
#
################################################################################
Orderer: &OrdererDefaults

    # Orderer Type: The orderer implementation to start
    OrdererType: etcdraft
    
    # Addresses used to be the list of orderer addresses that clients and peers
    # could connect to.  However, this does not allow clients to associate orderer
    # addresses and orderer organizations which can be useful for things such
    # as TLS validation.  The preferred way to specify orderer addresses is now
    # to include the OrdererEndpoints item in your org definition
    Addresses:
        - orderer.example.com:7050
        - orderer2.example.com:7050
        - orderer3.example.com:7050
        - orderer4.example.com:7050
        - orderer5.example.com:7050

    EtcdRaft:
        Consenters:
        - Host: orderer.example.com
          Port: 7050
          ClientTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer.example.com/tls/server.crt
          ServerTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer.example.com/tls/server.crt
        - Host: orderer2.example.com
          Port: 7050
          ClientTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer2.example.com/tls/server.crt
          ServerTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer2.example.com/tls/server.crt
        - Host: orderer3.example.com
          Port: 7050
          ClientTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer3.example.com/tls/server.crt
          ServerTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer3.example.com/tls/server.crt
        - Host: orderer4.example.com
          Port: 7050
          ClientTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer4.example.com/tls/server.crt
          ServerTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer4.example.com/tls/server.crt
        - Host: orderer5.example.com
          Port: 7050
          ClientTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer5.example.com/tls/server.crt
          ServerTLSCert: ../organizations/ordererOrganizations/example.com/orderers/orderer5.example.com/tls/server.crt
    # Batch Timeout: The amount of time to wait before creating a batch
    BatchTimeout: 2s

    # Batch Size: Controls the number of messages batched into a block
    BatchSize:

        # Max Message Count: The maximum number of messages to permit in a batch
        MaxMessageCount: 10

        # Absolute Max Bytes: The absolute maximum number of bytes allowed for
        # the serialized messages in a batch.
        AbsoluteMaxBytes: 99 MB

        # Preferred Max Bytes: The preferred maximum number of bytes allowed for
        # the serialized messages in a batch. A message larger than the preferred
        # max bytes will result in a batch larger than preferred max bytes.
        PreferredMaxBytes: 512 KB

    # Organizations is the list of orgs which are defined as participants on
    # the orderer side of the network
    Organizations:

    # Policies defines the set of policies at this level of the config tree
    # For Orderer policies, their canonical path is
    #   /Channel/Orderer/<PolicyName>
    Policies:
        Readers:
            Type: ImplicitMeta
            Rule: "ANY Readers"
        Writers:
            Type: ImplicitMeta
            Rule: "ANY Writers"
        Admins:
            Type: ImplicitMeta
            Rule: "MAJORITY Admins"
        # BlockValidation specifies what signatures must be included in the block
        # from the orderer for the peer to validate it.
        BlockValidation:
            Type: ImplicitMeta
            Rule: "ANY Writers"

################################################################################
#
#   CHANNEL
#
#   This section defines the values to encode into a config transaction or
#   genesis block for channel related parameters.
#
################################################################################
Channel: &ChannelDefaults
    # Policies defines the set of policies at this level of the config tree
    # For Channel policies, their canonical path is
    #   /Channel/<PolicyName>
    Policies:
        # Who may invoke the 'Deliver' API
        Readers:
            Type: ImplicitMeta
            Rule: "ANY Readers"
        # Who may invoke the 'Broadcast' API
        Writers:
            Type: ImplicitMeta
            Rule: "ANY Writers"
        # By default, who may modify elements at this config level
        Admins:
            Type: ImplicitMeta
            Rule: "MAJORITY Admins"

    # Capabilities describes the channel level capabilities, see the
    # dedicated Capabilities section elsewhere in this file for a full
    # description
    Capabilities:
        <<: *ChannelCapabilities

################################################################################
#
#   Profile
#
#   - Different configuration profiles may be encoded here to be specified
#   as parameters to the configtxgen tool
#
################################################################################
Profiles:

    TwoOrgsOrdererGenesis:
        <<: *ChannelDefaults
        Orderer:
            <<: *OrdererDefaults
            Organizations:
                - *OrdererOrg
            Capabilities:
                <<: *OrdererCapabilities
        Consortiums:
            SampleConsortium:
                Organizations:
                    - *Org1
                    - *Org2
                    - *Org3
    TwoOrgsChannel:
        Consortium: SampleConsortium
        <<: *ChannelDefaults
        Application:
            <<: *ApplicationDefaults
            Organizations:
                - *Org1
                - *Org2
                - *Org3
            Capabilities:
                <<: *ApplicationCapabilities

I followed below steps base on above file:

• created multihost fabric network using docker swarm,
• created channel configuration in configtx.yaml,
• generated certificates using CA,
• created channel , approved from all Orgs
• installed and queried chaincode
• set up backend server to fetch/update data from network

Answer 1

To create additional channels in your existing Hyperledger Fabric network, you can follow these general steps:

1. Create the channel configuration file: You can use the configtxgen tool to generate a new channel configuration file. You can use the existing channel configuration file as a template and modify it to include only the organizations you want to include in the new channel. For example, to create a channel for Org1-Org2, you can modify the existing channel configuration file to include only Org1 and Org2.
2. Create the channel: Once you have the channel configuration file, you can create the new channel using the peer channel create command. You'll need to specify the new channel name, the path to the channel configuration file, and the orderer endpoint.
3. Join the peers to the channel: After the channel is created, you'll need to join the peers from each organization to the new channel using the peer channel join command. You'll need to specify the new channel name and the address of the peer.
4. Install and instantiate the chaincode: Once the peers are joined to the new channel, you'll need to install and instantiate the chaincode on the new channel using the peer chaincode install and peer chaincode instantiate commands.
5. Repeat the process for the second channel: To create the second channel for Org1-Org3, you can repeat the above steps using a new channel configuration file that includes only Org1 and Org3.

For detailed steps and commands, you can refer to the official documentation Create a channel on creating and joining channels.

Note that the specific commands and steps may differ depending on your network setup and configuration.