本app的docker-compose.ymal中连接其他app已经启动的mongo image如何配置?

但还要执行mongo-init-replica段

• 比如:

version: '2'
services:
 rocketchat:
 image: rocketchat/rocket.chat:latest
 command: bash -c 'for i in `seq 1 30`; do node main.js && s=$$? && break || s=$$?; echo "Tried $$i times. Waiting 5 secs..."; sleep 5; done; (exit $$s)'
 restart: unless-stopped
 volumes:
 - ./uploads:/app/uploads
 environment:
 - PORT=3000
 - ROOT_URL=http://localhost:3000
 - MONGO_URL=mongodb://mongo:27017/rocketchat
 - MONGO_OPLOG_URL=mongodb://mongo:27017/local
 - MAIL_URL=smtp://smtp.email
# - HTTP_PROXY=http://proxy.domain.com
# - HTTPS_PROXY=http://proxy.domain.com
 depends_on:
 - mongo
 ports:
 - 3000:3000
 labels:
 - "traefik.backend=rocketchat"
 - "traefik.frontend.rule=Host: your.domain.tld"
 mongo:
 image: mongo:4.0
 restart: unless-stopped
 volumes:
 - ./data/db:/data/db
 #- ./data/dump:/dump
 command: mongod --smallfiles --oplogSize 128 --replSet rs0 --storageEngine=mmapv1
 labels:
 - "traefik.enable=false"
 # this container's job is just run the command to initialize the replica set.
 # it will run the command and remove himself (it will not stay running)
 mongo-init-replica:
 image: mongo:4.0
 command: 'bash -c "for i in `seq 1 30`; do mongo mongo/rocketchat --eval \"rs.initiate({ _id: ''rs0'', members: [ { _id: 0, host: ''localhost:27017'' } ]})\" && s=$$? && break || s=$$?; echo \"Tried $$i times. Waiting 5 secs...\"; sleep 5; done; (exit $$s)"'
 depends_on:
 - mongo
 # hubot, the popular chatbot (add the bot user first and change the password before starting this image)
 hubot:
 image: rocketchat/hubot-rocketchat:latest
 restart: unless-stopped
 environment:
 - ROCKETCHAT_URL=rocketchat:3000
 - ROCKETCHAT_ROOM=GENERAL
 - ROCKETCHAT_USER=bot
 - ROCKETCHAT_PASSWORD=botpassword
 - BOT_NAME=bot
 # you can add more scripts as you'd like here, they need to be installable by npm
 - EXTERNAL_SCRIPTS=hubot-help,hubot-seen,hubot-links,hubot-diagnostics
 depends_on:
 - rocketchat
 labels:
 - "traefik.enable=false"
 volumes:
 - ./scripts:/home/hubot/scripts
 # this is used to expose the hubot port for notifications on the host on port 3001, e.g. for hubot-jenkins-notifier
 ports:
 - 3001:8080 
	 ```