Public bug reported:
The lxc-net script in /usr/lib/$archtriplet/lxc/lxc-net attempts to use
ifconfig first and then falls back to trying to use ip(8) in the ifup()
and ifdown() shell functions. This behavior should be reversed, as ip
has been preferred over ifconfig for several years now.
As an example of why, lxc-net breaks the network setup within virtualbox
guests. After starting lxc-net, the route table looks like:
ubuntu@vivid-i386:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.2.2 0.0.0.0 UG 1024 0 0 eth0
10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lxcbr0
10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
This is despite the following settings in /etc/default/lxc-net:
LXC_BRIDGE="lxcbr0"
LXC_ADDR="10.0.3.1"
LXC_NETMASK="255.255.255.0"
LXC_NETWORK="10.0.3.0/24"
Switching the order in ifup and ifdown to try using ip first results in
the correct netmask being applied:
ubuntu@vivid-i386:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.2.2 0.0.0.0 UG 1024 0 0 eth0
10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.0.3.0 0.0.0.0 255.255.255.0 U 0 0 0 lxcbr0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
Looking at sh -x output when running lxc-net manually, it *looks* like
ifconfig is being invoked correctly, so I don't know why it's getting
the netmask wrong:
+ use_iptables_lock=-w
+ iptables -w -L -n
+ [ -d /sys/class/net/lxcbr0 ]
+ brctl addbr lxcbr0
+ echo 1
+ [ ! -d /run/lxc ]
+ ifup lxcbr0 10.0.3.1 255.255.255.0
+ which ifconfig
+ [ 0 = 0 ]
+ ifconfig lxcbr0 10.0.3.1 netmask 255.255.255.0 up
+ return
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lxc 1.1.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
Uname: Linux 3.18.0-13-generic i686
ApportVersion: 2.16.1-0ubuntu2
Architecture: i386
Date: Sat Feb 21 00:13:27 2015
InstallationDate: Installed on 2014-12-12 (70 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha i386 (20141212)
ProcEnviron:
TERM=screen
SHELL=/bin/bash
PATH=(custom, no user)
LANG=en_US.UTF-8
XDG_RUNTIME_DIR=<set>
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.flags = up
lxc.network.hwaddr = 00:16:3e:xx:xx:xx
modified.conffile..etc.default.lxc: [modified]
mtime.conffile..etc.default.lxc: 2015-02-20T18:15:56.552501
** Affects: lxc (Ubuntu)
Importance: Undecided
Status: New
** Tags: apparmor apport-bug i386 third-party-packages vivid
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https://bugs.launchpad.net/bugs/1424143
Title:
lxc-net should attempt to use ip before ifconfig, not vice-versa
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