請(qǐng)問docker-compose建立links之后，什么原因在/etc/hosts中沒有創(chuàng)建引用

docker-compose.yml

version: '2'
services:
  api:
    build: .
    links:
      - mongo:mongo
    ports:
      - 9527:9527
    restart: unless-stopped
    volumes:
      - $PWD:/usr/src/app/
    env_file:
      - .env
    environment:
      - MONGO_HOST=mongodb://mongo/api
    hostname: api
    depends_on:
      - mongo
  mongo:
    image: bitnami/mongodb:latest
    hostname: mongo
    restart: unless-stopped
    ports:
      - 27017:27017

api容器的/etc/hosts

127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.18.0.3      api

mongo容器的/etc/hosts

127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.18.0.2      mongo

創(chuàng)建沒有問題，但是按我的理解，應(yīng)該在api容器的/etc/hosts創(chuàng)建一個(gè)別名,結(jié)果就是沒有,只是創(chuàng)建了容器自己的