Docker compose for mongodb and seed containers

docker-compose.yml

version: '2'

services:
  mongodb:
    image: mongo:3.2.6
    ports:
      - "27017:27017"

  mongo-seed:
    image: mongo:3.2.6
    links:
      - mongodb
    volumes:
      - ./seed-data:/seed-data
    command:
      'bash -c "mongoimport --host mongodb --type json --file /seed-data/projects.json --jsonArray"'

Thank you for gist. I tried your method. But code probably doesn't works because mongo_seed cannot reach db from mongo. As I understand links wait container run, but not prepared db.

I created branch for test here git clone https://github.com/ravecat/mendeleev.git --single-branch --branch issue/seed_mongo_docker_compose.

If I check docker container logs mongo_seed I get

Failed: error connecting to db server: no reachable servers
imported 0 documents

But I can run mongoimport command from host system and it will be successfully or run mongo with any custom port (in my example mongo --port 27019)

Could you clarify that?