embedded dns problems

docker-compose.yml

version: "2"

services:

  ping:
    image: python:3.6-alpine
    command: "ping -c 1 google.com"

  dns:
    image: python:3.6-alpine
    command: "cat /etc/resolv.conf"

output.txt

$ sudo ./test.sh 
PING google.com (172.217.3.174): 56 data bytes
64 bytes from 172.217.3.174: seq=0 ttl=50 time=3.913 ms

--- google.com ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 3.913/3.913/3.913 ms
search redacted.com
options ndots:2
nameserver 10.18.0.1
nameserver 10.18.0.2
nameserver 10.50.5.1

Creating pingtest_ping_1
Creating pingtest_dns_1
Attaching to pingtest_ping_1, pingtest_dns_1
dns_1   | search redacted.com
dns_1   | nameserver 127.0.0.11
dns_1   | options ndots:2 ndots:0
pingtest_dns_1 exited with code 0
ping_1  | ping: bad address 'google.com'
pingtest_ping_1 exited with code 1

test.sh

docker network create updog
docker run --rm --network updog python:3.6-alpine ping -c 1 google.com
docker run --rm --network updog python:3.6-alpine cat /etc/resolv.conf
docker network rm updog

docker-compose up --build