Public bug reported:
Using uvtool, I am trying to bring up a xenial VM with a bridge to my
LAN, and a static network address which I inject using write-files and
some bootcmd & runcmd steps (details below).
Following the instructions in /etc/network/interfaces.d/50-cloud-
init.cfg, I have written "network: {config: disabled}" to
/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg in a bootcmd step.
For a trusty VM, this works:
ubuntu@test-nwtn2:~$ ip address list
...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:e1:8b:c3 brd ff:ff:ff:ff:ff:ff
inet 10.42.20.4/16 brd 10.42.255.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fee1:8bc3/64 scope link
valid_lft forever preferred_lft forever
But for a xenial VM, I find that the VM has two IP addresses: my
statically assigned one and another which turns out to have come from
DHCP (checked using DHCP logs).
ubuntu@test-nwtn2:~$ ip address list
...
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:1d:e9:17 brd ff:ff:ff:ff:ff:ff
inet 10.42.0.60/16 brd 10.42.255.255 scope global ens3
valid_lft forever preferred_lft forever
inet 10.42.20.4/16 brd 10.42.255.255 scope global secondary ens3
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe1d:e917/64 scope link
valid_lft forever preferred_lft forever
My host is running 16.04:
will@host-nwtn25:~$ uname -a
Linux host-nwtn25 4.4.0-42-generic #62-Ubuntu SMP Fri Oct 7 23:11:45 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
will@host-nwtn25:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
will@host-nwtn25:~$ dpkg -l|grep cloud
ii cloud-image-utils 0.27-0ubuntu24
all cloud image management utilities
ii ubuntu-cloudimage-keyring 2013.11.11
all GnuPG keys of the Ubuntu Cloud Image builder
will@host-nwtn25:~$ dpkg -l|grep uvt
ii uvtool-libvirt 0~bzr99-0ubuntu1
all Library and tools for using Ubuntu Cloud Images with libvirt
My command is:
sudo uvt-kvm create test-nwtn2 release=xenial arch=amd64 --bridge br0
--cpu 2 --memory 2048 --disk 16384 --user-data cloud-config.yml --log-
console-output
And cloud-config.yml has:
#cloud-config
...
bootcmd:
- "echo 'network: {config: disabled}'
>/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg"
write_files:
- path: /etc/network/interfaces
content: |
auto lo
iface lo inet loopback
auto ens3
iface ens3 inet static
address 10.42.20.4
network 10.42.0.0
broadcast 10.42.255.255
netmask 255.255.0.0
gateway 10.42.0.1
dns-nameservers 10.42.0.1
runcmd:
- ifdown -a && ifup -a
I've also tried removing /etc/network/interfaces.d/50-cloud-init.cfg in
my bootcmd step, which didn't seem to change anything.
(For trusty, the write_files talked about eth0 instead of ens3.)
** Affects: cloud-init
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1633656
Title:
Can't disable DHCP network config on xenial
Status in cloud-init:
New
Bug description:
Using uvtool, I am trying to bring up a xenial VM with a bridge to my
LAN, and a static network address which I inject using write-files and
some bootcmd & runcmd steps (details below).
Following the instructions in /etc/network/interfaces.d/50-cloud-
init.cfg, I have written "network: {config: disabled}" to
/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg in a bootcmd
step.
For a trusty VM, this works:
ubuntu@test-nwtn2:~$ ip address list
...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:e1:8b:c3 brd ff:ff:ff:ff:ff:ff
inet 10.42.20.4/16 brd 10.42.255.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fee1:8bc3/64 scope link
valid_lft forever preferred_lft forever
But for a xenial VM, I find that the VM has two IP addresses: my
statically assigned one and another which turns out to have come from
DHCP (checked using DHCP logs).
ubuntu@test-nwtn2:~$ ip address list
...
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:1d:e9:17 brd ff:ff:ff:ff:ff:ff
inet 10.42.0.60/16 brd 10.42.255.255 scope global ens3
valid_lft forever preferred_lft forever
inet 10.42.20.4/16 brd 10.42.255.255 scope global secondary ens3
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe1d:e917/64 scope link
valid_lft forever preferred_lft forever
My host is running 16.04:
will@host-nwtn25:~$ uname -a
Linux host-nwtn25 4.4.0-42-generic #62-Ubuntu SMP Fri Oct 7 23:11:45 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
will@host-nwtn25:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
will@host-nwtn25:~$ dpkg -l|grep cloud
ii cloud-image-utils 0.27-0ubuntu24
all cloud image management utilities
ii ubuntu-cloudimage-keyring 2013.11.11
all GnuPG keys of the Ubuntu Cloud Image builder
will@host-nwtn25:~$ dpkg -l|grep uvt
ii uvtool-libvirt 0~bzr99-0ubuntu1
all Library and tools for using Ubuntu Cloud Images with libvirt
My command is:
sudo uvt-kvm create test-nwtn2 release=xenial arch=amd64 --bridge br0
--cpu 2 --memory 2048 --disk 16384 --user-data cloud-config.yml --log-
console-output
And cloud-config.yml has:
#cloud-config
...
bootcmd:
- "echo 'network: {config: disabled}'
>/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg"
write_files:
- path: /etc/network/interfaces
content: |
auto lo
iface lo inet loopback
auto ens3
iface ens3 inet static
address 10.42.20.4
network 10.42.0.0
broadcast 10.42.255.255
netmask 255.255.0.0
gateway 10.42.0.1
dns-nameservers 10.42.0.1
runcmd:
- ifdown -a && ifup -a
I've also tried removing /etc/network/interfaces.d/50-cloud-init.cfg
in my bootcmd step, which didn't seem to change anything.
(For trusty, the write_files talked about eth0 instead of ens3.)
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