DNS resolution failure on Docker for Mac with IPv6 nameservers #28573
Description
Description
If the OS X network settings have an IPv6 DNS server in the DNS Servers list then all DNS queries will fail (timeout) in docker containers. Even if there are valid IPv4 DNS server listed, the presence of a single IPv6 server causes resolution to fail.
A simple workaround for this issue (besides manually overriding your DNS settings on the Mac) is to connect to Moby and force DNS servers in the docker daemon:
Open /etc/init.d/docker and add the --dns flag:
case "$(mobyplatform)" in
windows|mac)
DOCKER_OPTS="${DOCKER_OPTS} --swarm-default-advertise-addr=eth0 --dns 8.8.8.8 --dns 8.8.4.4"
;;
esacThen run
$ service docker restartSteps to reproduce the issue:
- Add an IPv6 nameserver and an IPv4 nameserver to your network settings.
- Run a Docker container and try to ping a host.
Describe the results you received:
Failure to use DNS in Docker container.
Describe the results you expected:
DNS functions normally.
Additional information you deem important (e.g. issue happens only occasionally):
It seems like probably others have ran into this issue (possibly unknowingly) in #24344.
Output of docker version:
Client:
Version: 1.12.3
API version: 1.24
Go version: go1.6.3
Git commit: 6b644ec
Built: Thu Oct 27 00:09:21 2016
OS/Arch: darwin/amd64
Experimental: true
Server:
Version: 1.12.3
API version: 1.24
Go version: go1.6.3
Git commit: 6b644ec
Built: Thu Oct 27 00:09:21 2016
OS/Arch: linux/amd64
Experimental: true
Output of docker info:
Containers: 113
Running: 1
Paused: 0
Stopped: 112
Images: 1149
Server Version: 1.12.3
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 1298
Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: host bridge null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: seccomp
Kernel Version: 4.4.30-moby
Operating System: Alpine Linux v3.4
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 1.951 GiB
Name: moby
ID: TB4S:V22M:Y2IP:IBBK:MJO6:DHX5:LEQ2:NAGC:BRX6:H5AI:6HR4:NMAI
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
File Descriptors: 18
Goroutines: 36
System Time: 2016-11-18T07:18:08.844111745Z
EventsListeners: 0
No Proxy: *.local, 169.254/16
Username: chris
Registry: https://index.docker.io/v1/
Experimental: true
Insecure Registries:
Additional environment details (AWS, VirtualBox, physical, etc.):