我在this SO answer之后创建了一个本地MongoDB副本集。
docker-compose文件：

services:
  mongo1:
    container_name: mongo1
    image: mongo:4.2
    ports:
      - 27017:27017
    restart: always
    command: ["--bind_ip_all", "--replSet", "rs" ]
  mongo2:
    container_name: mongo2
    image: mongo:4.2
    ports:
      - 27018:27017
    restart: always
    command: ["--bind_ip_all", "--replSet", "rs" ]
  mongo3:
    container_name: mongo3
    image: mongo:4.2
    ports:
      - 27019:27017
    restart: always
    command: ["--bind_ip_all", "--replSet", "rs" ]
  replica_set:
    image: mongo:4.2
    container_name: replica_set
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    volume:
      - ./initiate_replica_set.sh:/initiate_replica_set.sh
    entrypoint: 
      - /initiate_replica_set.sh

initiate_replica_set. sh文件：

#!/bin/bash
echo "Starting replica set initialize"
until mongo --host mongo1 --eval "print(\"waited for connection\")"
do
    sleep 2
done
echo "Connection finished"
echo "Creating replica set"
mongo --host mongo1 <<EOF
rs.initiate(
  {
    _id : 'rs0',
    members: [
      { _id : 0, host : "mongo1:27017" },
      { _id : 1, host : "mongo2:27017" },
      { _id : 2, host : "mongo3:27017" }
    ]
  }
)
EOF
echo "replica set created"

复制副本集已成功启动并正常运行，但当我尝试连接到复制副本集时，它出错：

$ mongo "mongodb://localhost:27017,localhost:27018,localhost:27019/?replicaSet=rs"
MongoDB shell version v5.0.2
connecting to: mongodb://localhost:27017,localhost:27018,localhost:27019/?compressors=disabled&gssapiServiceName=mongodb&replicaSet=rs
{"t":{"$date":"2021-08-05T21:35:40.667Z"},"s":"I",  "c":"NETWORK",  "id":4333208, "ctx":"ReplicaSetMonitor-TaskExecutor","msg":"RSM host selection timeout","attr":{"replicaSet":"rs","error":"FailedToSatisfyReadPreference: Could not find host matching read preference { mode: \"nearest\" } for set rs"}}
Error: Could not find host matching read preference { mode: "nearest" } for set rs, rs/localhost:27017,localhost:27018,localhost:27019 :
connect@src/mongo/shell/mongo.js:372:17
@(connect):2:6
exception: connect failed
exiting with code 1

更多详细日志：

{
  "t": {
    "$date": "2021-08-05T21:35:54.531Z"
  },
  "s": "I",
  "c": "-",
  "id": 4333222,
  "ctx": "ReplicaSetMonitor-TaskExecutor",
  "msg": "RSM received error response",
  "attr": {
    "host": "mongo1:27017",
    "error": "HostUnreachable: Error connecting to mongo1:27017 :: caused by :: Could not find address for mongo1:27017: SocketException: Host not found (authoritative)",
    "replicaSet": "rs",
    "response": "{}"
  }
}

问题的原因是什么，我如何解决它？