无法使用docker-compose运行具有副本集的mongo容器

这是我的docker-compose文件：

version: '3'
services:

  mongo:
    hostname: mongo
    container_name: search_mongo
    image: mongo:latest
    volumes:
      - ./docker/local/persist/mongo:/data/db
      - ./docker/mongo:/opt/mongo
    ports:
      - "8884:27017"
      - "8885:27018"
    entrypoint: /opt/mongo/entrypoint_mongo.sh

  agent:
    build: .
    image: myapp_search:compose
    depends_on:
      - mongo

这是我的entrypoint_mongo.sh

#!/bin/bash
mongod --port 27018 --replSet rs0 --fork --syslog --smallfiles
mongo --port 27018 --eval "rs.initiate({_id : 'rs0', members : [{_id : 0, host : 'mongo:27018'}]})"
mongo --port 27018 --eval "while(true) {if (rs.status().ok) break;sleep(1000)};"

我面临的问题是：mongo容器正在成功执行所有步骤，但退出时的状态为0。

mongo_1          | about to fork child process, waiting until server is ready for connections.
mongo_1          | forked process: 7
mongo_1          | child process started successfully, parent exiting
mongo_1          | MongoDB shell version v3.4.10
mongo_1          | connecting to: mongodb://127.0.0.1:27018/
mongo_1          | MongoDB server version: 3.4.10
mongo_1          | { "ok" : 1 }
mongo_1          | MongoDB shell version v3.4.10
mongo_1          | connecting to: mongodb://127.0.0.1:27018/
mongo_1          | MongoDB server version: 3.4.10
search_mongo exited with code 0