# Transport\_address resolved as IP:PORT in docker
**URL:** https://discuss.elastic.co/t/transport-address-resolved-as-ip-port-in-docker/302718
**Category:** Elasticsearch
**Tags:** docker
**Created:** [April 19, 2022, 1:21pm UTC](https://discuss.elastic.co/t/transport-address-resolved-as-ip-port-in-docker/302718 "2022-04-19T13:21:09Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Jan\_Kucera](https://discuss.elastic.co/u/Jan_Kucera)
#### Post date: [April 19, 2022, 1:21pm UTC](https://discuss.elastic.co/t/transport-address-resolved-as-ip-port-in-docker/302718/1 "2022-04-19T13:21:10Z")
Hello everyone,
I am struggling with Docker and Elasticsearch. I am trying to setup my instance so it has published adddress in format HOSTNAME:PORT and not IP:PORT for both HTTP and transport. I am posting my docker-compose setting (with ES 8.0.0)
```auto
elastic-1:
container_name: elastic-1
restart: unless-stopped
environment:
- INSTANCE_NAME=elastic-1
- node.name=elastic-1
- cluster.name=elastic
- cluster.initial_master_nodes=elastic-1
- bootstrap.memory_lock=true
- ES_SETTING_NETWORK_HOST=elastic-1
- ES_SETTING_TRANSPORT_HOST=elastic-1
- ES_JAVA_OPTS=-Xms512m -Xmx512m -Des.transport.cname_in_publish_address=true
```
Instance is running well however when I call `_nodes/_all/os` I get following results:
```auto
"nodes": {
"xjHfLp5gTo2jSEebxUhOAA": {
"name": "elastic-1",
"transport_address": "172.20.100.10:9300",
"host": "elastic-1",
"ip": "172.20.100.10",
"version": "8.0.0",
"http": {
"bound_address": [
"172.20.100.10:9200"
],
"publish_address": "elastic-1/172.20.100.10:9200",
"max_content_length_in_bytes": 104857600
}
```
My question is how can I achieve "elastic-1:9300" in `transport_address` and `publish_address`? My issue is that I am trying to use Apache Spark connecting to ES and it fails since it tries to connect to node using IP address and not hostname.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 17, 2022, 1:22pm UTC](https://discuss.elastic.co/t/transport-address-resolved-as-ip-port-in-docker/302718/2 "2022-05-17T13:22:05Z")
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