No alive nodes found in your cluster | connection refused (Docker, PHP) - php

Question

UPDATED INFO
With dd($clientBuilder->transport->getLastConnection()->getLastRequestInfo());
I could log out the following
"curl" => array:2 [
"error" => "Failed to connect to localhost port 30003: Connection refused"
But the thing is Elasticsearch is available under localhost:30003 via the web browser
The sample output when reaching this site:
{
"name": "xyz",
"cluster_name": "docker-cluster",
...
}
I did configure the host
$clientBuilder = ClientBuilder::create()
->setHosts(['http://localhost:30003/'])
->build();
When I dd($clientBuilder), the host is set to localhost:30003
#serializer: SmartSerializer {#385 …}
#transportSchema: "http"
#host: "localhost:30003"
#path: "/"
Again, the server is up and running, I can reach it via the web browser but I still get the error message:
No alive nodes found in your cluster
Elasticsearch version: 6.7.0
Elasticsearch PHP Version: 6.7.0 (latest)
In my docker-compose file, I'm mapping the port 30003 to 9200
ports:
- "30003:9200"

Answer 1

Elasticsearch did not cause the error.
cURL had an error 7 which means that it could not establish a connection.
My solution I came up with was the following:
$clientBuilder = ClientBuilder::create()
->setHosts([
[
'host' => 'docker.for.mac.localhost',
'port' => '30003'
]
])
->build();
I switched from localhost to docker.for.mac.localhost
This helped because I'm using docker container and each container has a different ip adress