How to pass hostIP and hostname in environment variables

[mx1700]

May I ask, how can I obtain the IP and hostname of the host computer for my container?

[psviderski]

Uncloud doesn't automatically inject environment variables to service containers with the host IP or hostname values. But you can try injecting these values via binding a file from the host to the container.

First, create a file on the host, e.g. at /opt/uncloud/host_info:

HOST_IP=1.2.3.4
HOSTNAME=my-server

Then in your Compose file bind mount this file to the service container at /host_info:

services:
  myapp:
     ...
    volumes:
      - /opt/uncloud/host_info:/host_info

Then you can access /host_info from the process inside your container. You can also try changing the command that runs in the container to something like:

command: export $(cat /host_info | xargs) && start-app

In this case, HOST_IP and HOSTNAME will be passed as env variables to the start-app process.