What's the source of Error: getaddrinfo EAI_AGAIN?

Question

If you get this error with Firebase Cloud Functions, this is due to the limitations of the free tier (outbound networking only allowed to Google services).

Upgrade to the Flame or Blaze plans for it to work.

EAI_AGAIN is a DNS lookup timed out error, means it is a network connectivity error or proxy related error.

My main question is what does dns.js do?

• The dns.js is there for node to get ip address of the domain(in brief).

Some more info: http://www.codingdefined.com/2015/06/nodejs-error-errno-eaiagain.html

If you get this error from within a docker container, e.g. when running npm install inside of an alpine container, the cause could be that the network changed since the container was started.

To solve this, just stop and restart the container

docker-compose down
docker-compose up

Source: https://github.com/moby/moby/issues/32106#issuecomment-578725551

As xerq's excellent answer explains, this is a DNS timeout issue.

I wanted to contribute another possible answer for those of you using Windows Subsystem for Linux - there are some cases where something seems to be askew in the client OS after Windows resumes from sleep. Restarting the host OS will fix these issues (it's also likely restarting the WSL service will do the same).

The OP's error specifies a host (my-store.myshopify.com). The error I encountered is the same in all respects except that no domain is specified.

My solution may help others who are drawn here by the title "Error: getaddrinfo EAI_AGAIN"

I encountered the error when trying to serve a NodeJs & VueJs app from a different VM from where the code was developed originally.

The file vue.config.js read :

 module.exports = {
   devServer: {
     host: 'tstvm01',
     port: 3030,
   },
 };

When served on the original machine the start up output is :

App running at:
- Local:   http://tstvm01:3030/ 
- Network: http://tstvm01:3030/

Using the same settings on a VM tstvm07 got me a very similar error to the one the OP describes:

 INFO  Starting development server...
 10% building modules 1/1 modules 0 activeevents.js:183                              
      throw er; // Unhandled 'error' event
      ^

Error: getaddrinfo EAI_AGAIN
    at Object._errnoException (util.js:1022:11)
    at errnoException (dns.js:55:15)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:92:26)

If it ain't already obvious, changing vue.config.js to read ...

 module.exports = {
   devServer: {
     host: 'tstvm07',
     port: 3030,
   },
 };

... solved the problem.

This is the issue related to hosts file setup. Add the following line to your hots file In Ubuntu: /etc/hosts

127.0.0.1   localhost

In windows: c:\windows\System32\drivers\etc\hosts

127.0.0.1   localhost

I started getting this error (different stack trace though) after making a trivial update to my GraphQL API application that is operated inside a docker container. For whatever reason, the container was having difficulty resolving a back-end service being used by the API.

After poking around to see if some change had been made in the docker base image I was building from (node:13-alpine, incidentally), I decided to try the oldest computer science trick of rebooting... I stopped and started the docker container and all went back to normal.

Clearly, this isn't a meaningful solution to the underlying problem - I am merely posting this since it did clear up the issue for me without going too deep down rabbit holes.