[Bug 1770082] Re: systemd-networkd not renaming devices on boot
Nicorac
1770082 at bugs.launchpad.net
Thu Sep 13 10:28:04 UTC 2018
Just tried with a fresh installed Ubuntu SERVER 18.04.1.
The interface now got renamed but IP address is not applied, both static and DHCP.
If I run "netplan apply" just after reboot+login, network interface is
configured correctly (again, both with static/DHCP address).
----------------------------------------------
Just after reboot + login
----------------------------------------------
# ifconfig -a
eth_lan: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 08:00:27:6b:d8:91 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 14 bytes 910 (910.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 14 bytes 910 (910.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
----------------------------------------------
After netplan apply
----------------------------------------------
# netplan apply
# ifconfig -a
eth_lan: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.3.200 netmask 255.255.0.0 broadcast 10.0.255.255
inet6 fe80::a00:27ff:fe6b:d891 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:6b:d8:91 txqueuelen 1000 (Ethernet)
RX packets 28739 bytes 2625648 (2.6 MB)
RX errors 0 dropped 3379 overruns 0 frame 0
TX packets 186 bytes 19916 (19.9 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 197 bytes 14182 (14.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 197 bytes 14182 (14.1 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
----------------------------------------------
netplan config
----------------------------------------------
# cat /etc/netplan/01-netcfg.yaml
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
version: 2
renderer: networkd
ethernets:
id0:
match:
macaddress: 08:00:27:6b:d8:91
set-name: eth_lan
# dhcp4: true
addresses: [ 10.0.3.200/16 ]
gateway4: 10.0.0.1
nameservers:
addresses:
- 8.8.4.4
I'm going to remove all of this netplan stuff and get back to old
working /ets/network/interface...
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https://bugs.launchpad.net/bugs/1770082
Title:
systemd-networkd not renaming devices on boot
Status in netplan:
Fix Released
Status in cloud-init package in Ubuntu:
Confirmed
Status in netplan.io package in Ubuntu:
Fix Released
Status in nplan package in Ubuntu:
Fix Released
Status in systemd package in Ubuntu:
Confirmed
Status in nplan source package in Xenial:
Fix Released
Status in netplan.io source package in Bionic:
Fix Released
Bug description:
[Impact]
Systems relying on renaming network interfaces at boot and when 'netplan apply' is run.
[Test case]
- Write a new netplan YAML (adjusting for current system as necessary):
network:
version: 2
ethernets:
ens3:
dhcp4: true
match:
macaddress: 52:54:00:de:bd:f6
set-name: myif0
- Run 'netplan apply'
- Verify that the device is correctly renamed to 'myif0'.
- Reboot.
- Make sure the device is correctly renamed to 'myif0'.
[Regression potential]
Changes in rename logic to add udev rules may otherwise impact applying different settings to the network interfaces. Changes in settings on network interfaces, missing parameters (especially on bonds, bridges) should be investigated as potential regressions. Other failures to apply network settings might also happen if there's a race between applying renames via the udev rules, and using the new names to apply configuration changes to the interfaces.
=== systemd issue ===
Renaming devices doesn't seem to work.
If I disable all other network configuration and create
/etc/systemd/network/10-network.link with:
[Match]
MACAddress=52:54:00:c1:c9:bb
[Link]
Name=myiface3
I expect this to cause the device with that MAC address to be renamed
to myiface3. However, when I reboot, I instead see:
$ ip l
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 52:54:00:c1:c9:bb brd ff:ff:ff:ff:ff:ff
The device is not renamed.
This link file is pretty much identical to Example 2 in
https://www.freedesktop.org/software/systemd/man/systemd.link.html.
The renaming does work if I boot with net.ifnames=0, and oddly, it
also works if I unbind the device and rebind it as netplan apply does.
No setting of NamePolicy seems to help.
=== Original Bug ==
'set-name:' doesn't change the name of a network interface on boot, it
only works when you do netplan apply.
Say I take this 50-cloud-init.yaml file:
# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
version: 2
ethernets:
ens3:
dhcp4: true
match:
macaddress: 52:54:00:de:bd:f6
set-name: ens3
Say I change set-name to 'myiface3' and reboot. I expect that the
device will be called myiface3 and brought up fine with dhcp. However,
instead I see:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 52:54:00:de:bd:f6 brd ff:ff:ff:ff:ff:ff
The name has not been changed, and the device has not been brought up.
If I run netplan apply however, I see the following:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
3: myiface3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:de:bd:f6 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.151/24 brd 192.168.122.255 scope global dynamic myiface3
valid_lft 3575sec preferred_lft 3575sec
inet6 fe80::5054:ff:fede:bdf6/64 scope link
valid_lft forever preferred_lft forever
So names are successfully changed with netplan apply.
This seems to be some udev-related timing or priority issue that I'm
still trying to hunt down.
This breaks some forms of migration in certain cloud environments.
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