** Description changed:
+ [Impact]
+ All users of netplan.
+
+ [Test case]
+
+ == LXD containers ==
+ 1) Start an LXD container (artful or bionic)
+ 2) Verify that an IPv6 address is present
+ 3) Verify that the system is brought up in a reasonable time (does not wait 2
minutes to be reachable).
+
+ == servers / cloud instances ==
+ 1) Start a bionic system, with no IPv6 connectivity (no router to advertise a
prefix)
+ 2) Verify that the system boots quickly (does not wait 2 minutes to be
reachable).
+
+ [Regression potential]
+ Since this changes default IPv6 behavior, care should be taken to validate
that systems are maintaining IPv6 connectivity when it is available, and
similarly that systems where no IPv6 connectivity is available on the network
are behaving correctly: there should not be long boot delays, and no extra IPv6
addresses aside from link-local addresses generated by the kernel.
+
+ --
+
I noticed that lxd (lxc list) reports that an lxc container has an ipv6
address in artful or bionic. It does not list this in xenial or zesty.
I suspect this change occurred in the switch over to netplan/networkd.
This may at first seem harmless or even desired, but note that the user
configuration did not request ipv6 config, so its presence is a bug.
$ for rel in xenial zesty artful bionic; do
- lxc launch ubuntu-daily:$rel $rel-demo; done
+ lxc launch ubuntu-daily:$rel $rel-demo; done
Creating xenial-demo
Starting xenial-demo
..
Creating bionic-demo
Starting bionic-demo
-
$ sleep 10
$ lxc list
$ lxc list
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| NAME | STATE | IPV4 | IPV6
| TYPE | SNAPSHOTS |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| artful-demo | RUNNING | 10.75.205.208 (eth0) |
fd42:eee5:7c43:3d62:3a42:611c:3f6f:1184 (eth0) | PERSISTENT | 0 |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| bionic-demo | RUNNING | 10.75.205.187 (eth0) |
fd42:eee5:7c43:3d62:6f4:155b:39cc:fc3d (eth0) | PERSISTENT | 0 |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| xenial-demo | RUNNING | 10.75.205.143 (eth0) |
| PERSISTENT | 0 |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
| zesty-demo | RUNNING | 10.75.205.123 (eth0) |
| PERSISTENT | 0 |
+-------------+---------+----------------------+------------------------------------------------+------------+-----------+
## Here is the config that was provided by lxd
$ lxc exec bionic-demo cat /var/lib/cloud/seed/nocloud-net/network-config
version: 1
config:
- - type: physical
- name: eth0
- subnets:
- - type: dhcp
- control: auto
+ - type: physical
+ name: eth0
+ subnets:
+ - type: dhcp
+ control: auto
## Here is the config that cloud-init rendered.
$ lxc exec bionic-demo -- grep -v '^#' /etc/netplan/50-cloud-init.yaml
network:
- version: 2
- ethernets:
- eth0:
- dhcp4: true
+ version: 2
+ ethernets:
+ eth0:
+ dhcp4: true
$ lxc exec bionic-demo cat /run/systemd/network/10-netplan-eth0.network
[Match]
Name=eth0
[Network]
DHCP=ipv4
[DHCP]
UseMTU=true
RouteMetric=100
$ lxc exec bionic-demo -- systemctl status --no-pager --full systemd-networkd
● systemd-networkd.service - Network Service
- Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled;
vendor preset: enabled)
- Active: active (running) since Mon 2017-11-13 18:37:34 UTC; 8min ago
- Docs: man:systemd-networkd.service(8)
- Main PID: 118 (systemd-network)
- Status: "Processing requests..."
- Tasks: 1 (limit: 4915)
- Memory: 2.0M
- CPU: 19ms
- CGroup: /system.slice/systemd-networkd.service
- └─118 /lib/systemd/systemd-networkd
+ Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled;
vendor preset: enabled)
+ Active: active (running) since Mon 2017-11-13 18:37:34 UTC; 8min ago
+ Docs: man:systemd-networkd.service(8)
+ Main PID: 118 (systemd-network)
+ Status: "Processing requests..."
+ Tasks: 1 (limit: 4915)
+ Memory: 2.0M
+ CPU: 19ms
+ CGroup: /system.slice/systemd-networkd.service
+ └─118 /lib/systemd/systemd-networkd
Nov 13 18:37:34 bionic-demo systemd[1]: Starting Network Service...
Nov 13 18:37:34 bionic-demo systemd-networkd[118]: eth0: Gained IPv6LL
Nov 13 18:37:34 bionic-demo systemd-networkd[118]: Enumeration completed
Nov 13 18:37:34 bionic-demo systemd[1]: Started Network Service.
Nov 13 18:37:37 bionic-demo systemd-networkd[118]: eth0: DHCPv6 address
fd42:eee5:7c43:3d62:6f4:155b:39cc:fc3d/128 timeout preferred 3600 valid 3600
Nov 13 18:37:37 bionic-demo systemd-networkd[118]: eth0: DHCPv4 address
10.75.205.187/24 via 10.75.205.1
Nov 13 18:37:37 bionic-demo systemd-networkd[118]: Not connected to system
bus, ignoring transient hostname.
Nov 13 18:37:39 bionic-demo systemd-networkd[118]: eth0: Configured
Nov 13 18:38:09 bionic-demo systemd-networkd[118]: Could not set hostname:
Method call timed out
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nplan 0.30
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu4
Architecture: amd64
Date: Mon Nov 13 18:27:53 2017
ProcEnviron:
- TERM=xterm-256color
- PATH=(custom, no user)
- LANG=C.UTF-8
+ TERM=xterm-256color
+ PATH=(custom, no user)
+ LANG=C.UTF-8
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1732002
Title:
cloud images in lxc get ipv6 address
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