# uname -a
Linux hostname-redacted 3.13.0-112-generic #159-Ubuntu SMP Fri Mar 3 15:26:07 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
# docker version
Client:
Version: 17.04.0-ce
API version: 1.28
Go version: go1.7.5
Git commit: 4845c56
Built: Mon Apr 3 18:01:08 2017
OS/Arch: linux/amd64
Server:
Version: 17.04.0-ce
API version: 1.28 (minimum version 1.12)
Go version: go1.7.5
Git commit: 4845c56
Built: Mon Apr 3 18:01:08 2017
OS/Arch: linux/amd64
Experimental: false
This is likely to happen in other versions too but this is the one I've tried so far, against Linux 3.13.0-112 and 3.13.0-116
sudo docker run --privileged --rm golang:1.8 sh -c "go get github.com/prasincs/docker-netlink-issue/... && exec docker-netlink-issue"
Output:
2017/04/21 19:47:22 ip addr dev tun0 fd28:49be:758:7653:3cb1:6d:230c:60/64
2017/04/21 19:47:22 Failed to add fd28:49be:758:7653:3cb1:6d:230c:60/64 to dev "tun0": permission denied
<nil>
2017/04/21 19:47:22 Error opening tun. permission denied
When you downgrade to docker 17.03 it works like a charm
sudo docker run --privileged --rm golang:1.8 sh -c "go get github.com/prasincs/docker-netlink-issue/... && exec docker-netlink-issue"
2017/04/21 19:48:08 ip addr dev tun0 fd28:49be:758:7653:3cb1:6d:230c:60/64
&{tun0 0xc42000e038}
The code works fine outside of docker.
Adding the following options for dockerd doesn't help either
DOCKER_OPTS="--ipv6=true --fixed-cidr-v6=fd28:49be::0/120"
ip tuntap add mode tun
ip addr add dev tun0 fd28:49be:758:7653:3cb1:6d:230c:60/64
RTNETLINK answers: Permission denied
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