docker 27.0.0~rc.1 does not use host dns #48015
Description
Description
On debian arm64 the new docker-ce version 27 rc1 is already published, after an update my buildx node on this host could not build a docker image that pull from an internal git server.
on arm64:
#13 [linux/arm64 build 4/5] RUN nslookup <my-url>
#13 0.264 Server: 8.8.8.8
#13 0.264 Address: 8.8.8.8#53
#13 0.264
#13 0.264 Non-authoritative answer:
#13 0.264 Name: <my_url>
#13 0.264 Address: <some ip>
#13 0.264
on amd64 node:
#15 [linux/amd64 build 4/5] RUN nslookup <my-url>
#15 0.468 Server: <internal dns server>
#15 0.468 Address: <internal dns server>#53
#15 0.468
#15 0.468 Name: <my-url>
#15 0.468 Address: <my-ip>
#15 0.468
I compared /etc/resolv.conf of the buildkit container:
arm64 on v27:
cat /etc/resolv.conf
# Generated by Docker Engine.
# This file can be edited; Docker Engine will not make further changes once it
# has been modified.
nameserver 127.0.0.11
options ndots:0
# Based on host file: '/etc/resolv.conf' (internal resolver)
# ExtServers: <some ip>
# Overrides: []
# Option ndots from: internal
arm64 on v26
/ # cat /etc/resolv.conf
# Generated by Docker Engine.
# This file can be edited; Docker Engine will not make further changes once it
# has been modified.
nameserver <some ip>
# Based on host file: '/etc/resolv.conf' (legacy)
# Overrides: []
amd64 on v26
cat /etc/resolv.conf
# Generated by Docker Engine.
# This file can be edited; Docker Engine will not make further changes once it
# has been modified.
nameserver <my dns server>
search <my dns search>
# Based on host file: '/etc/resolv.conf' (legacy)
# Overrides: []
I noticed on arm64 that the nameserver on v26 was moved to the line # ExtServers: [<ip>] on v27.
I could also manage to build successfully using docker buildx build --network=host
I know that v27 is not yet released, but maybe someone else runs into this too. Also how can I migrate to v27 and have workin DNS?
Reproduce
- update docker to version 27.0.0-rc1
- try nslookup for some internal dns name
Expected behavior
The correct IP should be resolved
docker version
docker --version
Docker version 27.0.0-rc.1, build 9dabf16docker info
unfortunately I already downgraded and can not break the system to check `docker info`Additional Info
No response