[Bug 1573272] Re: default gateway route not installed for bond interfaces through reboot
Robie Basak
1573272 at bugs.launchpad.net
Tue May 23 06:43:17 UTC 2017
Hi Dan,
I'm not particularly familiar with ifupdown. The reentrancy is a red
flag for me. Is there an existing example of ifup being called from an
if-pre-up.d script?
I think it would be best to get a review from someone more familiar with
this area before upload.
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https://bugs.launchpad.net/bugs/1573272
Title:
default gateway route not installed for bond interfaces through reboot
Status in vlan package in Ubuntu:
In Progress
Status in vlan package in Debian:
New
Bug description:
[Impact]
Systems using vlans, especially those using vlans on top of bond
interfaces, in addition to default or other routes on the vlans, may
find their vlan routes are not present at boot.
The attached debdiff patches fix the vlan package's /etc/network/if-
pre-up.d/vlan script. Currently, the script will bring up a vlan's
raw device if needed; but the problem is if the vlan's ifup processing
happens before the raw device's ifup processing, the raw device may be
taken down and back up (especially for bonds), and when the raw device
is taken down, the vlan is as well, and thus loses all its routing
configuration. Instead of only bringing the raw device up using ip
link up, the patch changes the vlan script to do a full ifup on the
raw device, so it will remain up after the vlan is configured.
[Test Case]
Set up a system using two interfaces configured into a bond interface,
with a vlan on top of that bond. Add a default route and/or specific
routes to the vlan interface. Then edit the system as described in
comment 8, and reboot. The vlan's routes will not be present in the
system.
[Regression Potential]
Any modifications to ifupdown or the scripts it uses may cause wider
problems with network configuration. Specifically, this could cause
problems when using vlan interfaces, as it forces every vlan's raw
device interface to be fully ifup'ed before the vlan interface can
finish its ifup.
[Other Info]
original description below:
Expectation: After reboot, route for default gateway specified on bonded interface is installed according to "gateway x.x.x.x" (where x.x.x.x is a valid IPv4 address) specified in /etc/network/interfaces or files sourced per /etc/network/interfaces
Actual Result: After reboot, route is not installed. Interface does
work otherwise (I can ping the gateway on that subnet, for instance).
'ifdown -a' followed by 'ifup -a' (run with proper permission... so
sudo) brings the gateway back until next reboot.
Package: I'm not familiar enough to be certain what is causing this,
but I was seeing this in beta2 of 16.04 as well.
*username snipped*@*hostname snipped*:~$ lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
*username snipped*@*hostname snipped*:~$ apt-cache policy ifenslave
ifenslave:
Installed: 2.7ubuntu1
Candidate: 2.7ubuntu1
Version table:
*** 2.7ubuntu1 100
100 /var/lib/dpkg/status
*username snipped*@*hostname snipped*:~$ apt-cache policy ifupdown
ifupdown:
Installed: 0.8.10ubuntu1
Candidate: 0.8.10ubuntu1
Version table:
*** 0.8.10ubuntu1 100
100 /var/lib/dpkg/status
/etc/network/interfaces
----------------------------------
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto enp2s0f1
iface enp2s0f1 inet manual
bond-master bond0
auto enp2s0f0
iface enp2s0f0 inet manual
bond-master bond0
auto bond0
iface bond0 inet static
address 10.96.96.2
netmask 255.255.255.0
network 10.96.96.0
broadcast 10.96.96.255
# dns-* options are implemented by the resolvconf package, if installed
dns-search *snip*
bond-mode balance-alb
bond-slaves none
bond-miimon 100
auto bond0.3000
iface bond0.3000 inet static
address 172.21.33.29
netmask 255.255.255.0
network 172.21.33.0
broadcast 172.21.33.255
gateway 172.21.33.1
dns-search *snip*
vlan-raw-device bond0
dns-nameservers 172.31.10.84 8.8.8.8 4.2.2.2
-----------------------------------------------------
interfaces.d is empty:
*username snipped*@*hostname snipped*:~$ ls -lisah /etc/network/interfaces.d
total 8.0K
10748247 4.0K drwxr-xr-x 2 root root 4.0K Jan 24 14:08 .
10748237 4.0K drwxr-xr-x 7 root root 4.0K Apr 21 17:32 ..
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