[Bug 1736975] Re: netplan does not bring up anonymous bridge on boot
Steve Langasek
steve.langasek at canonical.com
Thu Nov 8 17:05:35 UTC 2018
** Changed in: netplan.io (Ubuntu Bionic)
Status: Fix Released => Fix Committed
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https://bugs.launchpad.net/bugs/1736975
Title:
netplan does not bring up anonymous bridge on boot
Status in netplan:
Fix Released
Status in netplan.io package in Ubuntu:
Fix Released
Status in nplan package in Ubuntu:
Triaged
Status in netplan.io source package in Bionic:
Fix Committed
Bug description:
[Impact]
Netplan users setting up bridges.
[Test cases]
1) Add a new bridge configuration in netplan yaml, without an IP address set:
[...]
bridges:
br0:
interfaces: [ interface ]
dhcp4: false
parameters:
stp: false
forward-delay: 0
[Regression potential]
Possible regression scenarios might be for a configured bridge not to come up / not be created or added by systemd-networkd when the network is configured; or for a bridge to be configured with addresses that should not be present (ie. dhcp when it is not enabled, or link-local address when not configured).
---
Configuring "/etc/netplan/01-netcfg.yaml" with an anonymous bridge
seems to require running "ip link set dev br0 up" to bring the bridge
up after boot. A bridge configured with an IP address is automatically
up after boot.
This is only a problem if you want an anonymous bridge which comes up
automatically after boot. For example, if you preferred to isolate
host traffic from your autostarting virtual machine traffic.
Configuration that results in the bridge being down after boot:
network:
version: 2
renderer: networkd
ethernets:
enp22s2:
dhcp4: yes
enp22s3:
dhcp4: no
bridges:
br0:
interfaces: [enp22s3]
dhcp4: false
parameters:
stp: false
forward-delay: 0
Enabling DHCP results in a bridge that is automatically up after boot:
network:
version: 2
renderer: networkd
ethernets:
enp22s2:
dhcp4: yes
enp22s3:
dhcp4: no
bridges:
br0:
interfaces: [enp22s3]
dhcp4: true
parameters:
stp: false
forward-delay: 0
Setting a static IP address results in a bridge that is automatically up after boot:
network:
version: 2
renderer: networkd
ethernets:
enp22s2:
dhcp4: yes
enp22s3:
dhcp4: no
bridges:
br0:
interfaces: [enp22s3]
dhcp4: false
addresses: [192.168.1.100/24]
parameters:
stp: false
forward-delay: 0
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: nplan 0.30
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
Date: Thu Dec 7 11:06:25 2017
ProcEnviron:
LANGUAGE=en_CA:en
TERM=screen
PATH=(custom, no user)
LANG=en_CA.UTF-8
SHELL=/bin/bash
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)
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