Verification-done for cosmic, using netplan.io 0.96-0ubuntu0.18.10.2:
As for the above test, I set up a new AWS instance (t2.micro); and
applied the configuration (first trying to just set mtu: 1500; then
using dhcp4-overrides: { use-mtu: false }).
ubuntu@ip-172-30-0-81:~$ dpkg -l netplan.io | grep ii
ii netplan.io 0.96-0ubuntu0.18.10.2 amd64 YAML network
configuration abstraction for various backends
ubuntu@ip-172-30-0-81:~$ sudo netplan --debug apply
** (generate:2737): DEBUG: 16:39:55.688: Processing input file
/etc/netplan/50-cloud-init.yaml..
** (generate:2737): DEBUG: 16:39:55.689: starting new processing pass
** (generate:2737): DEBUG: 16:39:55.689: Generating output files..
** (generate:2737): DEBUG: 16:39:55.689: NetworkManager: definition eth0 is not
for us (backend 1)
(generate:2737): GLib-DEBUG: 16:39:55.689: posix_spawn avoided (fd close
requested)
DEBUG:netplan generated networkd configuration changed, restarting networkd
DEBUG:no netplan generated NM configuration exists
DEBUG:eth0 not found in {}
DEBUG:Merged config:
network:
bonds: {}
bridges: {}
ethernets:
eth0:
dhcp4: true
dhcp4-overrides:
use-mtu: false
match:
macaddress: 06:9d:85:76:e2:b2
mtu: 1500
set-name: eth0
vlans: {}
wifis: {}
DEBUG:Skipping non-physical interface: lo
DEBUG:device eth0 operstate is up, not changing
DEBUG:{}
DEBUG:netplan triggering .link rules for lo
DEBUG:netplan triggering .link rules for eth0
ubuntu@ip-172-30-0-81:~$ ip link
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
mode DEFAULT group default qlen 1000
link/ether 06:9d:85:76:e2:b2 brd ff:ff:ff:ff:ff:ff
** Tags removed: verification-needed verification-needed-cosmic
** Tags added: verification-done-cosmic
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https://bugs.launchpad.net/bugs/1807273
Title:
netplan not respecting mtu
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