Public bug reported:
>From <https://askubuntu.com/questions/1054572/netplan-is-there-an-
equivalent-to-post-up>, a user wants to add a static route to a network
interface where the gateway is known, but the interface's local address
is configured via dhcp.
This doesn't work with direct netplan yaml, because networkd will try to
apply the static routes before the interface has been configured via
dhcp, failing because there is not yet a route to the gateway on that
interface.
Demonstrating in a lxd container locally, which has 10.44.49.0/24 as its
network:
$ cat /etc/netplan/50-cloud-init.yaml
# 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:
eth0:
dhcp4: true
routes:
- to: 10.44.48.0/24
via: 10.44.49.2
metric: 10
$ systemctl status systemd-networkd --no-pager -l
● systemd-networkd.service - Network Service
Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled;
vendor preset: enabled)
Active: active (running) since Fri 2018-07-13 19:21:29 UTC; 8min ago
Docs: man:systemd-networkd.service(8)
Main PID: 165 (systemd-network)
Status: "Processing requests..."
Tasks: 1 (limit: 4915)
CGroup: /system.slice/systemd-networkd.service
└─165 /lib/systemd/systemd-networkd
Jul 13 19:21:29 stable-dane systemd[1]: Starting Network Service...
Jul 13 19:21:29 stable-dane systemd-networkd[165]: Enumeration completed
Jul 13 19:21:29 stable-dane systemd[1]: Started Network Service.
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Could not set route:
Network is unreachable
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: DHCPv4 address
10.44.49.32/24 via 10.44.49.1
Jul 13 19:21:29 stable-dane systemd-networkd[165]: Not connected to system bus,
not setting hostname.
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Gained IPv6LL
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Configured
Jul 13 19:21:55 stable-dane systemd-networkd[165]: Could not set hostname:
Method call timed out
$ ip route
default via 10.44.49.1 dev eth0 proto dhcp src 10.44.49.32 metric 100
10.44.49.0/24 dev eth0 proto kernel scope link src 10.44.49.32
10.44.49.1 dev eth0 proto dhcp scope link src 10.44.49.32 metric 100
$
netplan and networkd should DTRT.
** Affects: netplan
Importance: Low
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: netplan
Importance: Undecided => Low
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1781652
Title:
should be possible to specify static routes on a dhcp-configured
interface
Status in netplan:
New
Status in systemd package in Ubuntu:
New
Bug description:
From <https://askubuntu.com/questions/1054572/netplan-is-there-an-
equivalent-to-post-up>, a user wants to add a static route to a
network interface where the gateway is known, but the interface's
local address is configured via dhcp.
This doesn't work with direct netplan yaml, because networkd will try
to apply the static routes before the interface has been configured
via dhcp, failing because there is not yet a route to the gateway on
that interface.
Demonstrating in a lxd container locally, which has 10.44.49.0/24 as
its network:
$ cat /etc/netplan/50-cloud-init.yaml
# 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:
eth0:
dhcp4: true
routes:
- to: 10.44.48.0/24
via: 10.44.49.2
metric: 10
$ systemctl status systemd-networkd --no-pager -l
● systemd-networkd.service - Network Service
Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled;
vendor preset: enabled)
Active: active (running) since Fri 2018-07-13 19:21:29 UTC; 8min ago
Docs: man:systemd-networkd.service(8)
Main PID: 165 (systemd-network)
Status: "Processing requests..."
Tasks: 1 (limit: 4915)
CGroup: /system.slice/systemd-networkd.service
└─165 /lib/systemd/systemd-networkd
Jul 13 19:21:29 stable-dane systemd[1]: Starting Network Service...
Jul 13 19:21:29 stable-dane systemd-networkd[165]: Enumeration completed
Jul 13 19:21:29 stable-dane systemd[1]: Started Network Service.
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Could not set route:
Network is unreachable
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: DHCPv4 address
10.44.49.32/24 via 10.44.49.1
Jul 13 19:21:29 stable-dane systemd-networkd[165]: Not connected to system
bus, not setting hostname.
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Gained IPv6LL
Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Configured
Jul 13 19:21:55 stable-dane systemd-networkd[165]: Could not set hostname:
Method call timed out
$ ip route
default via 10.44.49.1 dev eth0 proto dhcp src 10.44.49.32 metric 100
10.44.49.0/24 dev eth0 proto kernel scope link src 10.44.49.32
10.44.49.1 dev eth0 proto dhcp scope link src 10.44.49.32 metric 100
$
netplan and networkd should DTRT.
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