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I know there are a ton of similar issues, but none of them are working for me!

I'm running docker on Ubuntu 22.04.1 LTS. All I want to do is access a Elasticsearch-Instance that i mapped onto Port localhost:9208 via SSH-Tunnel, without switching the docker containers network mode to host.

Here is my minimal docker-compose.yml example:

version: '3'
services:
  curl_test:
    image: curlimages/curl
    command: "curl http://localhost:9208"

Output:

curl: (7) Failed to connect to localhost port 9208 after 0 ms: Connection refused

I tried:

  • Using the workaround using "host.docker.internal:host-gateway"
  • Specifiying extra_hosts
  • Mapping Port 9208 directly into the container

I know that this minimal example does not work. But all the fixes/changes proposed are not working. So I'm very glad for any suggestions for this problem.

Wackamie
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  • Is your Elasticsearch also running as docker container and defined in docker-compose.yaml? If yes, all the services by default use bridge network. Have you tried to reach it with its service name defined in docker-compose.yaml? – m19v Oct 06 '22 at 15:36
  • No elasticsearch is running on a remote host outside any docker environment. But I'm mapping it to localhost with an ssh tunnel. – Wackamie Oct 10 '22 at 05:52

1 Answers1

0

Finally fixed it!

The solution contains two parts:

1. Making hosts localhost accessible to docker container

All it needed was

extra_hosts:
  - "host.docker.internal:host-gateway"

2. More importantly: An SSH-Tunnel is not a normal localhost per se!

This @felix-k's answer in this post made me realize I had to map the remote port to dockers docker0 interface. All it needed was an additional tunnel:

ssh -N -L 172.17.0.1:9214:localhost:9200 user@remotehost

Wackamie
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