How to connect separate docker containers?-CodePudding

I have built three docker images of node, elastic search, and mongo. Then pushed those to docker hub. after pulling those images, I am running them using the command docker run. They are running successfully. But the node app is not being able to connect to mongo or elastic. I have tried creating a network and adding the containers to it, but it doesn't help. Can someone help regarding the issue?

CodePudding user response：

It depends on where the individual containers are running. If they are running on the same host, you can connect them to the same bridge network. Refer here: https://docs.docker.com/network/bridge/

If they are running on different host, you would have to use host networking and expose the relevant ports. Refer here: https://docs.docker.com/network/host/

CodePudding user response：

when working with multiple containers it's better to use Docker compose. you can create a docker-compose.yml file defining services(your containers) there.

Here is an example docker-compose.yml for node,mongo and elasticsearch

version: "3"
services:
backend:
    container_name: nodejs
    restart: always
    build: node
    ports:
    - "3010:3010"

    volumes:
    - .:/app
    - ./error.log:/usr/src/app/error.log
    links:
    - mongo
    - elasticsearch
mongo:
    container_name: mongo
    image: mongo
    ports:
    - "27017:27017"
    volumes:
    - ./data:/data/db
elasticsearch:
    container_name: elasticsearch
    image: docker.elastic.co/elasticsearch/elasticsearch:7.0.0
    environment:
    - node.name=es01
    - discovery.type=single-node
    - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    volumes:
    -  esdata:/usr/share/elasticsearch/data
    ports:
    - "9200:9200"    
volumes:
esdata:
    driver: local

Your question is not clear so I cant answer more than that