Hyperledger Fabric/Composer: Error reading configuration: While parsing config: yaml: unknown anchor 'OrdererDefaults' referenced

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Problem:

While trying to start the Hyperledger Fabric or Hyperledger Composer network, you might get the following error:

Generating orderer genesis block and channel config transaction with configtxgen
2018-08-22 11:28:37.034 UTC [common/tools/configtxgen] main -> WARN 001 Omitting the channel ID for configtxgen is deprecated. Explicitly passing the channel ID will be required in the future, defaulting to ‘testchainid’.
2018-08-22 11:28:37.034 UTC [common/tools/configtxgen] main -> INFO 002 Loading configuration
2018-08-22 11:28:37.040 UTC [common/tools/configtxgen/localconfig] Load -> CRIT 003 Error reading configuration: While parsing config: yaml: unknown anchor ‘OrdererDefaults’ referenced
2018-08-22 11:28:37.040 UTC [common/tools/configtxgen] func1 -> CRIT 004 Error reading configuration: While parsing config: yaml: unknown anchor ‘OrdererDefaults’ referenced
panic: Error reading configuration: While parsing config: yaml: unknown anchor ‘OrdererDefaults’ referenced [recovered]
panic: Error reading configuration: While parsing config: yaml: unknown anchor ‘OrdererDefaults’ referenced

Solution:

This error is related to the configtx.yaml file. That file can be inside artifacts folder or inside composer folder.

Find the configtx.yaml folder in the Hyperledger fabric or composer project that you are working on.
Open the configtx.yaml file.
You will see the Profile configuration code at the beginning of that file.


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

    TwoOrgsOrdererGenesis:
        Orderer:
            <<: *OrdererDefaults
            Organizations:
                - *OrdererOrg
        Consortiums:
            SampleConsortium:
                Organizations:
                    - *org1
                    - *org2
    TwoOrgsChannel:
        Consortium: SampleConsortium
        Application:
            <<: *ApplicationDefaults
            Organizations:
                - *org1
                - *org2

Cut this Profile configuration code and Paste it at the end of the configtx.yaml file.
So, now your configtx.yaml file will look like something like this:


# 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: OrdererMSP

        # ID to load the MSP definition as
        ID: OrdererMSP

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

    - &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

    - &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

################################################################################
#
#   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
    # Available types are "solo" and "kafka"
    OrdererType: solo

    Addresses:
        - orderer.example.com:7050

    # 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: 98 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

    Kafka:
        # Brokers: A list of Kafka brokers to which the orderer connects
        # NOTE: Use IP:port notation
        Brokers:
            - 127.0.0.1:9092

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

################################################################################
#
#   SECTION: Application
#
#   - This section defines the values to encode into a config transaction or
#   genesis block for application related parameters
#
################################################################################
Application: &ApplicationDefaults

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

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

    TwoOrgsOrdererGenesis:
        Orderer:
            <<: *OrdererDefaults
            Organizations:
                - *OrdererOrg
        Consortiums:
            SampleConsortium:
                Organizations:
                    - *org1
                    - *org2
    TwoOrgsChannel:
        Consortium: SampleConsortium
        Application:
            <<: *ApplicationDefaults
            Organizations:
                - *org1
                - *org2

Please note:
Sometime you might have two files:
– configtx.yaml
– configtxtemplate.yaml
In that case, configtxtemplate.yaml file will be overriding configtx.yaml file.
Hence, you need to do the above-mentioned changes in the configtxtemplate.yaml file, i.e. cutting the Profile configuration code and pasting it at the end of the file.

Now, run the startFabric or startNetwork command. It should run successfully.

Hope this helps. Thanks.

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