How to use multiple anchor peers in an organization

Question

I have read that we can use multiple to prevent SPOF. I want to develop a network with multiple anchor peers. How can I do it?

Answer 1

To use multiple anchor peers, you need to configure it with configtx.yaml. You should add new anchor peers as shown 
below:

Organizations:

    - &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: crypto-config/peerOrganizations/org1.example.com/msp

        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
            - Host: peer1.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: crypto-config/peerOrganizations/org2.example.com/msp

        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: 7051
            - Host: peer1.org2.example.com
              Port: 7051

The above code will define two anchor peers in each organization. Now, you have to use configtxgen to produce config update by using the following:

configtxgen -profile TwoOrgsChannel -channelID mychannel -outputAnchorPeersUpdate=Org1MSPanchors.tx -asOrg=Org1MSP
configtxgen -profile TwoOrgsChannel -channelID mychannel -outputAnchorPeersUpdate=Org2MSPanchors.tx -asOrg=Org2MSP

Now run the following code to update your channel:

# updating anchors for Org1
CORE_PEER_ADDRESS=peer0.org.example.com peer channel update -f Org1MSPanchors.tx -c mychannel -o orderer.example.com:7050

Comments

I made some changes in the solution mentioned above to match my system and it worked fine. Thanks.

Answer 2

By configuring multiple anchor peers, you distribute network communication responsibilities, making your network more robust and reducing the likelihood of communication breakdowns.