Which Peer container depends which CouchDB container in BYFN network?

If you are running BYFN (Build Your First Network) with the CouchDB option, the Peer and CouchDB Container Dependency is defined in the "docker-compose-couch.yaml" file.

$ cd ~/hyperledger-binaries/fabric-samples/first-network

$ more docker-compose-couch.yaml
# Copyright IBM Corp. All Rights Reserved.

version: '2'

networks:
  byfn:

services:
  couchdb0:
    container_name: couchdb0
    image: hyperledger/fabric-couchdb
    environment:
      - COUCHDB_USER=
      - COUCHDB_PASSWORD=
    ports:
      - "5984:5984"
    networks:
      - byfn

  peer0.org1.example.com:
    environment:
      - CORE_LEDGER_STATE_STATEDATABASE=CouchDB
      - CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS=couchdb0:5984
      - CORE_LEDGER_STATE_COUCHDBCONFIG_USERNAME=
      - CORE_LEDGER_STATE_COUCHDBCONFIG_PASSWORD=
    depends_on:
      - couchdb0

  ...

  couchdb3:
    container_name: couchdb3
    image: hyperledger/fabric-couchdb
    environment:
      - COUCHDB_USER=
      - COUCHDB_PASSWORD=
    ports:
      - "8984:5984"
    networks:
      - byfn

  peer1.org2.example.com:
    environment:
      - CORE_LEDGER_STATE_STATEDATABASE=CouchDB
      - CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS=couchdb3:5984
      - CORE_LEDGER_STATE_COUCHDBCONFIG_USERNAME=
      - CORE_LEDGER_STATE_COUCHDBCONFIG_PASSWORD=
    depends_on:
      - couchdb3  

As you can see, the Peer and CouchDB dependency is defined as:

peer0.org1.example.com -> couchdb0
peer1.org1.example.com -> couchdb1
peer0.org2.example.com -> couchdb2
peer1.org2.example.com -> couchdb3

By the way, there is no user names and passwords defined to protect CouchDB servers. This is ok for a developer environment.

⇒ Query CouchDB Container API Directly

⇐ CouchDB Container Used in Hyperledger Fabric

⇑ Hyperledger Fabric Docker Containers

⇑⇑ Hyperledger Tutorials