I have an Ubuntu 14.04.1 LTS server that's running LXC containers. The containers run Ubuntu 14.04.1 too. Network config of host is pretty standard, static IP, ISP's DNSes (IP1/IP2) plus google's :
$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.1.10
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers <IP1> <IP2> 8.8.8.8
No firewalls used on the system.
Now, inside the containers, apt-get works intermittently. After restarting the host and starting the containers, it works fine. But after 'a while' (I haven't measured it) apt-get starts failing:
# apt-get update
Ign http://security.ubuntu.com trusty-security InRelease
Ign http://security.ubuntu.com trusty-security Release.gpg
Ign http://security.ubuntu.com trusty-security Release
Ign http://archive.ubuntu.com trusty InRelease
<...>
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.92.201 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
The sources lists are default. Tried replacing them but made no difference. This happens to all containers. Nothing is changed when restarted. The strange thing is they can ping both IPs and hosts (so DNS probably works ok. Tried pinging google.com, ubuntu.com, archive.ubuntu.com, security.ubuntu.com, always success).
Container network config:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
Regarding LXC config, I use the default for ubuntu, veth device and an lxcbr0 bridge for all containers. I'm very new to LXC so bear with me if I screwed up somewhere...
Any ideas are helpful. Let me know if more info is needed, I'll update the description :)
Thanks for your time
PS: I've already tried the standard "apt-get fails" remedies like this one with no success.
dnsmasq
package from my system and just lettingLXC
handle everything.dnsmasq
was messing with the bridge settings, and I somehow had some extra bridges that weren't attached to anything. Oncednsmasq
was purged, I restarted the networking services, and it was golden.