Get host's hostname in docker compose

Question

what is the equivalent of docker swarm's {{.Node.Hostname}} in docker-compose. I am trying to get host's hostname in my docker-compose.yml file. Thanks.

Answer 1

you can use the extra_hosts option of docker compose.

first you need to define an alias for your host machine loopback in your host machine. for example :

sudo ifconfig lo0 alias 10.100.100.1/24

then in your docker-compose file:

extra_hosts:
    - "my_hostname:10.200.10.1"

to check the result run this :

$ docker exec -it your_container_name /bin/bash
// run a command to check connectivity to your host machine.like this:
// supposed you have a website running on host machine 
$ wget my_hostname/index.html
$ cat index.html