Steps:
- nova boot daily xenial cloud image
(ubuntu/ubuntu-xenial-daily-amd64-server-20160418-disk1.img), ssh in
- set up proxy in /etc/environment and restart lxd
- ip a says
2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc pfifo_fast state UP
group default qlen 1000
3: lxdbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UNKNOWN group default qlen 1000
- sudo lxd init; configure bridge for 10.0.8.1/24, IPv4 NAT, no IPv6
- Now lxdbr0 does not exist at all any more (?? → bug?), but "sudo
service lxd-bridge restart" brings it up:
4: lxdbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UNKNOWN group default qlen 1000
link/ether 52:4c:fa:1a:a8:84 brd ff:ff:ff:ff:ff:ff
inet 10.0.8.1/24 scope global lxdbr0
valid_lft forever preferred_lft forever
inet6 fe80::504c:faff:fe1a:a884/64 scope link
valid_lft forever preferred_lft forever
- lxc launch images:ubuntu/xenial/amd64 x1
- $ lxc exec x1 apt update
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
0% [Waiting for headers]
This hangs eternally.
- Temporarily lower MTU to 1400 to be able to install iputils-
tracepath, then crank it back to 1500
- root@x1:~# tracepath security.ubuntu.com
1?: [LOCALHOST] pmtu 1500
1: 10.0.8.1 0.072ms
1: 10.0.8.1 0.060ms
2: 10.0.8.1 0.173ms pmtu 1400
2: 10.220.40.1 0.620ms
3: 10.220.0.1 1.021ms
4: gooseberry-eth1.internal 1.964ms
5: no reply
6: no reply
7: no reply
8: no reply
9: no reply
(one more "no reply" about every second)
However, "ifconfig eth0 mtu 1400" doesn't change tracepath, but it
makes "apt update" work.
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https://bugs.launchpad.net/bugs/1572026
Title:
be more clever about MTU of lxdbr0
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