Description
Edit: There's a workaround in the comments below.
Ok so I have a fresh install of CentOS8, Docker, Docker compose. I'm trying to run Traefik. Created my network with docker create network proxy, attached it to my docker-compose file, ran my scripts, and it works. Kinda.
If I run a container with --net=host everything works fine. However, any other network I create does not resolve DNS
- This is a bug report
- This is a feature request
- I searched existing issues before opening this one (yeah it's like 4AM already)
Expected behavior
$ docker exec -it traefik ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=55 time=3.983 ms
64 bytes from 1.1.1.1: seq=1 ttl=55 time=4.077 ms
^C
--- 1.1.1.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 3.983/4.030/4.077 ms
Actual behavior
I repeat: If I run a container with --net=host everything works fine. However, any other network I create does not resolve DNS
$ docker exec -it traefik ping google.com
ping: bad address 'google.com
Steps to reproduce the behavior
I'm running a CentOS 8 VPS on Hetzner Cloud with the latest version of Docker (as of yesterday). The issue just "happened".
$ docker-compose -v
docker-compose version 1.25.4, build 8d51620a
Output of docker version:
$ docker -v
Docker version 19.03.8, build afacb8b
Output of docker info:
Client:
Debug Mode: false
Server:
Containers: 5
Running: 1
Paused: 0
Stopped: 4
Images: 1
Server Version: 18.09.1
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: c4446665cb9c30056f4998ed953e6d4ff22c7c39
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 4.18.0-80.11.2.el8_0.x86_64
Operating System: CentOS Linux 8 (Core)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.755GiB
Name: centos-4gb-nuremberg
ID: DUXL:2E6W:WKB3:CWRG:7BUY:4VIN:YMXX:FRTH:L7YK:L5LY:X3D4:Y52L
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine
Additional environment details (AWS, VirtualBox, physical, etc.)
Hetzner Cloud