[Bug 1118234] New: Docker doesn't update DNS IP when it's changed on system

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1118234

            Bug ID: 1118234
           Summary: Docker doesn't update DNS IP when it's changed on
                    system
           Product: Fedora EPEL
           Version: epel7
         Component: docker-io
          Severity: medium
          Assignee: lsm5(a)switzerlandmail.ch
          Reporter: maxime.carron(a)fedoraproject.org
        QA Contact: extras-qa(a)fedoraproject.org
                CC: admiller(a)redhat.com, golang(a)lists.fedoraproject.org,
                    hushan.jia(a)gmail.com, lsm5(a)switzerlandmail.ch,
                    mattdm(a)redhat.com, mgoldman(a)redhat.com, s(a)shk.io,
                    vbatts(a)redhat.com



Description of problem:
When the DNS server is changed on the system, docker keep using the one used at
its startup.

Version-Release number of selected component (if applicable):
EL 7.0
docker : 1.0.0-1

How reproducible:
Always.

Steps to Reproduce:
1. Start docker (systemctl start docker)
2. Do any operation which needs DNS resolution (docker pull fedora:latest)
=> System DNS is used
3. Change system DNS to 8.8.8.8 or any different DNS
4. Do some other operation which needs DNS resolution (docker pull
fedora:rawhide)
5. You should see that first is still used

Actual results:
No DNS update

Expected results:
Docker should use the current system DNS

Additional info:
This is especially disturbing on a laptop, because a docker restart is needed
everytime I change network (when first DNS is not reachable anymore, usually
when DNS has a private IP)

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