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[BUG] extra_hosts in docker compose 2.37.0 (latest version) doesn't work #12926
Description
Description
After a lot of investigation we found out that newest version of docker compose (2.37.0) extra_hosts is not working as expected.
as we ran cat /etc/hosts with latest docker:dind which was using the mentioned version the result was NOT as bellow which we were expecting:
#7 [service-email 4/5] RUN cat /etc/hosts
#7 0.089 127.0.0.1 localhost buildkitsandbox
#7 0.089 ::1 localhost ip6-localhost ip6-loopback
#7 0.089 172.17.0.1 host.docker.internal
it was actually missing 172.17.0.1 host.docker.internal part. it got fixed when we downgraded to docker:28.2.2-dind-alpine3.21.
Steps To Reproduce
using mentioned version (latest for now)
docker-compose:
services:
test:
image: test
build:
context: .
dockerfile: ./Dockerfile
args:
- PROFILE=$PROFILE
extra_hosts:
- "host.docker.internal=172.17.0.1"
and in Dockerfile run curl command against the host.docker.internal:2375
will result in:
> [5/5] RUN curl -IvL host.docker.internal:2375:
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Could not resolve host: host.docker.internal
0.436 * Closing connection
0.436 curl: (6) Could not resolve host: host.docker.internal
Compose Version
2.37.0
Docker Environment
Anything else?
No response
Activity
ndeloof commentedon Jun 11, 2025
This is related to docker/buildx#494
v2.37.0 use Docker Bake as build backend by default, you can temporary opt-out by setting COMPOSE_BAKE=false