** No longer affects: kolla
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https://bugs.launchpad.net/bugs/1763608
Title:
Netplan ignores Interfaces without IP Addresses
Status in netplan:
Fix Committed
Status in neutron:
Invalid
Status in netplan.io package in Ubuntu:
Fix Released
Status in netplan.io source package in Bionic:
Fix Committed
Status in netplan.io source package in Cosmic:
Fix Committed
Status in netplan.io source package in Disco:
Fix Committed
Bug description:
[Impact]
Netplan users who need to bring up an interface (set its flag to IFF_UP) but
not define an address, using the networkd renderer, as the interface may be
further managed via another tool.
[Test case]
1) Install Ubuntu
2) Set up netplan; with the following different use cases:
== New VLAN ==
network:
version: 2
renderer: networkd
ethernets:
[... whatever is already configured for the system...]
vlans:
vlan100:
link: <the existing ethernet>
id: 100
== Bring up an existing secondary interface ==
network:
version: 2
renderer: networkd
ethernets:
eth0: {}
3) Verify that in both cases, the interface (ethernet or VLAN) is brought up
and shows UP, LOWER_UP flags in the output of 'ip link'.
[Regression potential]
As this brings a behavior change in netplan where as soon as an interface is
listed in the netplan YAML, it will be brought up, care should be taken with
existing configurations that do work, if specific devices are listed but are
not assigned an IP address, as they will be brought up by networkd. This is
expected to be a limited number of cases already, and impact to network
installations is minimal.
----
The "manual" method in /etc/network/interfaces resulted in an
interface being brought up, but not having an IP address assigned.
When configuring an Interface without an IP Address, netplan ignores
the interface instead of bringing it up.
---
network:
version: 2
renderer: networkd
ethernets:
eth1: {}
Expected result from `netplan apply`: eth1 is brought up.
Actual result: eth1 is still down.
Similarly `netplan generate` does not generate any file in
/run/systemd/network for eth1.
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