4:11 a.m.
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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12:07 p.m.
New subject: [Bug 1118234] Docker doesn't update DNS IP when it's changed on system
https://bugzilla.redhat.com/show_bug.cgi?id=1118234
Lokesh Mandvekar <lsm5(a)switzerlandmail.ch> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Component|docker-io |docker-io
Version|epel7 |rawhide
Product|Fedora EPEL |Fedora
--- Comment #1 from Lokesh Mandvekar <lsm5(a)switzerlandmail.ch> ---
Hmm, don't have a fix yet, but it seems:
Case 1: change DNS from reachable to unreachable address, DNS settings take
effect right away
Case 2: change DNS from unreachable to reachable address, the very first docker
operation fails, but subsequent ones work without a restart.
Sample run follows (on a rawhide instance):
lsm5 @ nagato : /home/lsm5 $ docker pull fedora:latest
Pulling repository fedora
3f2fed40e4b0: Download complete
511136ea3c5a: Download complete
fd241224e9cf: Download complete
lsm5 @ nagato : /home/lsm5 $ cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
lsm5 @ nagato : /home/lsm5 $ sudo mv /etc/resolv.conf /etc/resolv.conf.safe
lsm5 @ nagato : /home/lsm5 $ sudo vim /etc/resolv.conf
lsm5 @ nagato : /home/lsm5 $ cat /etc/resolv.conf
nameserver 1.1.1.1
lsm5 @ nagato : /home/lsm5 $ docker pull fedora:rawhide
Pulling repository fedora
2014/07/11 11:43:36 Get
https://cdn-registry-1.docker.io/v1/repositories/library/fedora/tags: dial tcp:
lookup cdn-registry-1.docker.io on 1.1.1.1:53: no answer from server
lsm5 @ nagato : /home/lsm5 $ sudo mv /etc/resolv.conf.safe /etc/resolv.conf
lsm5 @ nagato : /home/lsm5 $ cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
lsm5 @ nagato : /home/lsm5 $ docker pull fedora:rawhide
Pulling repository fedora
2014/07/11 11:46:07 Get https://index.docker.io/v1/repositories/fedora/images:
dial tcp: lookup index.docker.io on 1.1.1.1:53: no answer from server
lsm5 @ nagato : /home/lsm5 $ docker pull fedora:rawhide
Pulling repository fedora
64fd7993bcaf: Download complete
64fd7993bcaf: Pulling image (rawhide) from fedora
511136ea3c5a: Download complete
---/var/log/messages---
Jul 11 11:40:14 nagato docker: [584bdf56] -job pull(fedora, latest) = OK (0)
Jul 11 11:42:45 nagato docker: 2014/07/11 11:42:45 POST
/images/create?fromImage=fedora&tag=rawhide
Jul 11 11:42:45 nagato docker: [584bdf56] +job pull(fedora, rawhide)
Jul 11 11:43:36 nagato docker: [error] server.go:1185 Get
https://cdn-registry-1.docker.io/v1/repositories/library/fedora/tags: dial tcp:
lookup cdn-registry-1.docker.io on 1.1.1.1:53: no answer from server
Jul 11 11:43:36 nagato docker: Get
https://cdn-registry-1.docker.io/v1/repositories/library/fedora/tags: dial tcp:
lookup cdn-registry-1.docker.io on 1.1.1.1:53: no answer from server
Jul 11 11:43:36 nagato docker: [584bdf56] -job pull(fedora, rawhide) = ERR (1)
Jul 11 11:45:47 nagato docker: 2014/07/11 11:45:47 POST
/images/create?fromImage=fedora&tag=rawhide
Jul 11 11:45:47 nagato docker: [584bdf56] +job pull(fedora, rawhide)
Jul 11 11:46:07 nagato docker: Get
https://index.docker.io/v1/repositories/fedora/images: dial tcp: lookup
index.docker.io on 1.1.1.1:53: no answer from server
Jul 11 11:46:07 nagato docker: [584bdf56] -job pull(fedora, rawhide) = ERR (1)
Jul 11 11:46:11 nagato docker: 2014/07/11 11:46:11 POST
/images/create?fromImage=fedora&tag=rawhide
Jul 11 11:46:11 nagato docker: [584bdf56] +job pull(fedora, rawhide)
Jul 11 11:46:16 nagato kernel: [37692.370612] EXT4-fs (dm-2): mounted
filesystem with ordered data mode. Opts: discard
Jul 11 11:46:16 nagato kernel: EXT4-fs (dm-2): mounted filesystem with ordered
data mode. Opts: discard
Jul 11 11:47:07 nagato kernel: [37743.712593] EXT4-fs (dm-3): mounted
filesystem with ordered data mode. Opts: discard
Jul 11 11:47:07 nagato kernel: EXT4-fs (dm-3): mounted filesystem with ordered
data mode. Opts: discard
Jul 11 11:47:16 nagato docker: [584bdf56] -job pull(fedora, rawhide) = OK (0)
---/var/log/messages---
Btw, the epel7 branch has been removed as docker is available by default on
RHEL7. Though not sure if docker 1.0.0 (and later) have made it into RHEL7
proper yet.
Changing bug Product and Version to Fedora and rawhide.
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3:49 p.m.
New subject: [Bug 1118234] Docker doesn't update DNS IP when it's changed on system
https://bugzilla.redhat.com/show_bug.cgi?id=1118234
Daniel Walsh <dwalsh(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dwalsh(a)redhat.com
--- Comment #2 from Daniel Walsh <dwalsh(a)redhat.com> ---
docker-1.3 should pick up the /etc/resolv.conf file on docker run time not at
the time the daemon starts.
I think this fixes most of your problem.
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11:56 a.m.
New subject: [Bug 1118234] Docker doesn't update DNS IP when it's changed on system
https://bugzilla.redhat.com/show_bug.cgi?id=1118234
Lokesh Mandvekar <lsm5(a)fedoraproject.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|lsm5(a)fedoraproject.org |
Assignee|lsm5(a)fedoraproject.org |lsm5(a)redhat.com
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1:33 p.m.
New subject: [Bug 1118234] Docker doesn't update DNS IP when it's changed on system
https://bugzilla.redhat.com/show_bug.cgi?id=1118234
Daniel Walsh <dwalsh(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |MODIFIED
--- Comment #3 from Daniel Walsh <dwalsh(a)redhat.com> ---
Not likely to change the rest.
Fixed in docker-1.3.1
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9:26 p.m.
New subject: [Bug 1118234] Docker doesn't update DNS IP when it's changed on system
https://bugzilla.redhat.com/show_bug.cgi?id=1118234
Lokesh Mandvekar <lsm5(a)redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|MODIFIED |CLOSED
Resolution|--- |CURRENTRELEASE
Last Closed| |2015-01-26 22:26:17
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