CODEWITHSUNDEEP
node.jsrestdockerdocker-composeaxios
François Romain
François Romain

Reputation: 14393

How to connect a Node.js app to an http rest API from a docker service?

A web-app in Node.js connects to an api with axios.

import axios from 'axios'

export function fetchList() {
  return axios.get('https://api.website.dev/v1/posts')
}

The api works well, all is fine.

Now, I use docker-compose to run the exact same nodejs web app inside a container.

docker-compose.yml:

version: "3.1"

services:

  nodejs:
    image: node:alpine
    working_dir: /home/app
    restart: always
    ports:
      - "8000:8080"
    volumes:
      - ../nodejs:/home/app
    command: ["npm", "start"]

The axios call to the Rest API returns an error: 

error { Error: getaddrinfo EAI_AGAIN api.domain.dev:443
  at Object.exports._errnoException (util.js:1024:11)
  at errnoException (dns.js:55:15)
  at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)
code: 'EAI_AGAIN',
errno: 'EAI_AGAIN',
syscall: 'getaddrinfo',
hostname: 'api.domain.dev',
host: 'api.domain.dev',
port: 443,
config:
 { adapter
…

How to make the nodejs app connect to the api from a docker container?

Upvotes: 1

Views: 2337

Answers (1)

Bukharov Sergey
Bukharov Sergey

Reputation: 10185

Dns server inside docker cluster does not know anyting about host api.website.dev

You can explicetelly set Ip address of this host. Try to add extra_hosts to the service definition in docker-compose.yml

nodejs:
    image: node:alpine
    working_dir: /home/app
    restart: always
    ports:
      - "8000:8080"
    volumes:
      - ../nodejs:/home/app
    command: ["npm", "start"]
    extra_hosts:
      - "api.website.dev:<IP_ADDRESS>

Or if you have external DNS server which knows something about website.dev you can add it to docker cluster as described here

Upvotes: 1

Related Questions