** Description changed:
Using MAAS 2.3, during commissioning (and likely in the rest of the
ephemeral environment) we have noticed that resolv.conf is not set with
the DNS server.
That said, during the commissioning process, MAAS does not send any
metadata to cloud-init to configure the network, rather, we expect the
image to boot from the network via DHCP. So, cloud-init writes:
ubuntu@manual:~$ cat /etc/network/interfaces.d/50-cloud-init.cfg
# 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}
auto lo
iface lo inet loopback
# control-manual ens3
iface ens3 inet dhcp
broadcast 192.168.122.255
dns-nameservers 192.168.122.2
gateway 192.168.122.1
netmask 255.255.255.0
Which correctly includes the DNS server. However:
ubuntu@manual:~$ ping google.com
ping: unknown host google.com
If restart the interfacE:
ubuntu@manual:~$ sudo ifdown ens3 && sudo ifup ens3
ifdown: interface ens3 not configured
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/ens3/52:54:00:ea:57:31
Sending on LPF/ens3/52:54:00:ea:57:31
Sending on Socket/fallback
DHCPDISCOVER on ens3 to 255.255.255.255 port 67 interval 3 (xid=0x14eb0354)
DHCPDISCOVER on ens3 to 255.255.255.255 port 67 interval 4 (xid=0x14eb0354)
DHCPREQUEST of 192.168.122.195 on ens3 to 255.255.255.255 port 67
(xid=0x5403eb14)
DHCPOFFER of 192.168.122.195 from 192.168.122.2
DHCPACK of 192.168.122.195 from 192.168.122.2
Restarting ntp (via systemctl): ntp.service.
bound to 192.168.122.195 -- renewal in 290 seconds.
ubuntu@manual:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.122.2
search maas
ubuntu@manual:~$ ping google.com
PING google.com (216.58.192.46) 56(84) bytes of data.
64 bytes from mia07s46-in-f14.1e100.net (216.58.192.46): icmp_seq=1 ttl=52
time=7.47 ms
^C
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.472/7.472/7.472/0.000 ms
As such, this either seems like a bug in Ubuntu, or caused by cloud-init
when writing e/n/i.d/50-cloud-init.cfg
ubuntu@manual:~$ dpkg -l | grep cloud-init
ii cloud-init 0.7.9-153-g16a7302f-0ubuntu1~16.04.2
all Init scripts for cloud instances
ii cloud-initramfs-copymods 0.27ubuntu1.4
all copy initramfs modules into root filesystem for later use
ii cloud-initramfs-dyn-netconf 0.27ubuntu1.4
all write a network interface file in /run for BOOTIF
ubuntu@manual:~$ uname -a
Linux manual 4.4.0-92-generic #115-Ubuntu SMP Thu Aug 10 09:04:33 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@manual:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
- ubuntu@manual:~$ pastebinit /var/log/cloud-init.log
+ ubuntu@manual:~$ pastebinit /var/log/cloud-init.log
http://paste.ubuntu.com/25342738/
- ubuntu@manual:~$ pastebinit /var/log/cloud-init-output.log
+ ubuntu@manual:~$ pastebinit /var/log/cloud-init-output.log
http://paste.ubuntu.com/25342740/
+
+ Related bugs:
+ * bug 1714308: dns does not work in initramfs after configure_networking
+ * bug 1713803: replacement of resolvconf with systemd needs integration
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https://bugs.launchpad.net/bugs/1711760
Title:
[2.3] resolv.conf is not set (during commissioning or testing)
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