How to fetch aws ecs container ip address in nodejs project - node.js

Question

I have uploaded my API project (Node.js project) to AWS ECS container and my project contains swagger documentation. In swagger I want to indicate the current host Ip address that the API is run on but I cannot find the right code to fetch it. There is a solution for that? since I have managed to implement it on .NetCore API.
How does it looks right now:
Thx in advance.

Answer 1

You can make use of AWS ECS metadata endpoint http://172.17.0.1:51678/v1/metadata from an ECS task to fetch details about the container instance. The details fetched can then be used to get the private/public ip address of the instance. Example:
import http from 'http';
import util from 'util';
import AWS from 'aws-sdk';
export const getIPAddresses = async () => {
try {
let options: any = {
hostname: '172.17.0.1',
port: 51678,
path: '/v1/metadata',
method: 'GET'
}
let containerInstanceDetails: any = await httpGet(options);
containerInstanceDetails = JSON.parse(containerInstanceDetails);
const cluster = containerInstanceDetails["Cluster"];
const containerInstanceArn = containerInstanceDetails["ContainerInstanceArn"];
const containerInstanceUUID = containerInstanceArn.split('/')[2];
let params: any = {
cluster: cluster,
containerInstances: [containerInstanceUUID]
}
if (!AWS.config.region) {
AWS.config.update({
region: <your_aws_region>
});
}
const ecs = new AWS.ECS({ 'region': <your_aws_region> });
const ec2 = new AWS.EC2({ 'region': <your_aws_region> });
const describeContainerInstancesAsync = util.promisify(ecs.describeContainerInstances).bind(ecs);
const describeInstancesAsync = util.promisify(ec2.describeInstances).bind(ec2);
let data = await describeContainerInstancesAsync(params);
const ec2InstanceId = data.containerInstances[0].ec2InstanceId;
params = {
InstanceIds: [
ec2InstanceId
]
}
data = await describeInstancesAsync(params);
return [data.Reservations[0].Instances[0].PrivateIpAddress, data.Reservations[0].Instances[0].PublicIpAddress];
}
catch(err) {
console.log(err);
}
}
async function httpGet(options) {
return new Promise((resolve, reject) => {
http.get(options, response => {
response.setEncoding('utf8');
response.on('data', data => {
resolve(data);
});
}).on('error', error => {
reject(error.message);
});
});
}