If you need access for example to a DB running on host from docker container while still using the bridge (default) network mode, start the container with following flag:
In docker run:
docker run --add-host host.docker.internal:host-gateway
In docker-compose.yml:
services:
myservice:
extra_hosts:
- host.docker.internal:host-gateway
This adds an /etc/hosts entry to the correct IP address for the host's gateway.
root@a499b6825b0d:/data# cat /etc/hosts 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00:: ip6-localnet ff00:: ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.1 host.docker.internal 172.17.0.2 a499b6825b0d