<p>I’m running into a problem with my Docker containers on Ubuntu 14.04 LTS.<br>
Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output below initially lead me to believe it was because apt-get is trying to resolve the DNS via IPv6.</p>
<p>I disabled IPv6 on my host machine and still, removed all images, pulled base ubuntu, and still ran into the problem.</p>
<p>I changed my /etc/resolve.conf nameservers from my local DNS server to Google’s public DNS servers (8.8.8.8 and 8.8.4.4) and still have no luck. I also set the DNS to Google in the DOCKER_OPTS of /etc/default/docker and restarted docker.</p>
<p>I also tried pulling coreos, and yum could not resolve DNS either.</p>
<p>It’s weird because while DNS does not work, I still get a response when I ping the same update servers that apt-get can’t resolve.</p>
<p>I’m not behind a proxy, I’m on a very standard local network, and this version of Ubuntu is up to date and fresh (I installed two days ago to be closer to docker).</p>
<p>I’ve thoroughly researched this through other posts on stackoverflow and github issues, but haven’t found any resolution. I’m out of ideas as to how to solve this problem, can anyone help?</p>
<p><strong>Error Message</strong></p>
<pre><code class="lang-auto">➜ arthouse git🙁docker) ✗ docker build --no-cache .
Sending build context to Docker daemon 51.03 MB
Sending build context to Docker daemon
Step 0 : FROM ubuntu:14.04
---> 5506de2b643b
Step 1 : RUN apt-get update
---> Running in 845ae6abd1e0
Err http://archive.ubuntu.com trusty InRelease
Err http://archive.ubuntu.com trusty-updates InRelease
Err http://archive.ubuntu.com trusty-security InRelease
Err http://archive.ubuntu.com trusty-proposed InRelease
Err http://archive.ubuntu.com trusty Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://archive.ubuntu.com trusty-updates Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://archive.ubuntu.com trusty-security Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://archive.ubuntu.com trusty-proposed Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Reading package lists...
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/InRelease
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/InRelease
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-proposed/InRelease
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-proposed/Release.gpg Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
</code></pre>
<p><strong>Container IFCONFIG/PING</strong></p>
<pre><code class="lang-auto">➜ code docker run -it ubuntu /bin/bash
root@7bc182bf87bb:/# ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:04
inet addr:172.17.0.4 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::42:acff:fe11:4/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:738 (738.0 B) TX bytes:648 (648.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
root@7bc182bf87bb:/# ping google.com
PING google.com (74.125.226.0) 56(84) bytes of data.
64 bytes from lga15s42-in-f0.1e100.net (74.125.226.0): icmp_seq=1 ttl=56 time=12.3 ms
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 12.367/12.367/12.367/0.000 ms
root@7bc182bf87bb:/# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=44 time=21.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=44 time=21.7 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=44 time=21.7 ms
</code></pre>
<p>Also, apt-get update fails when I force IPv4:</p>
<pre><code class="lang-auto">root@6d925cdf84ad:/# sudo apt-get update -o Acquire::ForceIPv4=true
Err http://archive.ubuntu.com trusty InRelease
Err http://archive.ubuntu.com trusty-updates InRelease
Err http://archive.ubuntu.com trusty-security InRelease
Err http://archive.ubuntu.com trusty-proposed InRelease
Err http://archive.ubuntu.com trusty Release.gpg
Unable to connect to archive.ubuntu.com:http: [IP: 91.189.88.153 80]
Err http://archive.ubuntu.com trusty-updates Release.gpg
Unable to connect to archive.ubuntu.com:http: [IP: 91.189.88.153 80]
Err http://archive.ubuntu.com trusty-security Release.gpg
Unable to connect to archive.ubuntu.com:http: [IP: 91.189.88.153 80]
Err http://archive.ubuntu.com trusty-proposed Release.gpg
Unable to connect to archive.ubuntu.com:http: [IP: 91.189.88.153 80]
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/InRelease
</code></pre>
