定义一系列的组织结构，根据服务对象类型的不同，包括Orderer组织和普通的应用组织。

Orderer类型组织包括名称、ID、MSP文件路径、管理员策略等，应用类型组织还会配置锚点Peer信息。这些组织都会被Profiles部分引用使用。

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

        # MSP的ID
        ID: OrdererMSP

        # MSP相关文件所在本地路径
        MSPDir: crypto-config/ordererOrganizations/example.com/msp
        AdminPricipal: Role.Admin # 组织管理员所需要的身份，可以为Role.Admin或Role.MEMBER

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

        # MSP的ID
        ID: Org1MSP

        # MSP相关文件所在本地路径
        MSPDir: crypto-config/peerOrganizations/org1.example.com/msp

        AnchorPeers:    #锚节点地址，用于夸组织的Gossip通信
            # 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

        # MSP的ID
        ID: Org2MSP

        # MSP相关文件所在本地路径
        MSPDir: crypto-config/peerOrganizations/org2.example.com/msp

        AnchorPeers:    #锚节点地址，用于夸组织的Gossip通信
            # 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