If you docker container has no internet connection maybe you docker network neither have it.
- Get virtual container bridge name:
network_name=$(docker inspect --format '{{ range $key, $value := .NetworkSettings.Networks }}{{ $key }}{{ end }}' $container)
etwork_id=$(docker network inspect -f {{.Id}} $network_name)
bridge_name="br-${network_id:0:12}"
- Obtain IP network address of the virtual bridge: