I've verified zesty with the script that is attached. Output is shown here.
** Attachment added: "verification log of zesty" https://bugs.launchpad.net/maas/+bug/1711760/+attachment/5023065/+files/zesty.log ** Tags removed: verification-needed verification-needed-zesty ** Tags added: verification-done verification-donezesty -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to resolvconf in Ubuntu. https://bugs.launchpad.net/bugs/1711760 Title: [2.3] resolv.conf is not set (during commissioning or testing) Status in MAAS: Fix Released Status in resolvconf package in Ubuntu: Won't Fix Status in resolvconf source package in Trusty: Fix Released Status in resolvconf source package in Xenial: Fix Released Status in resolvconf source package in Zesty: Fix Committed Bug description: === Begin SRU Template === [Impact] Without this fix applied, dns settings provided to the dhcp response in the initramfs are not reflected in the "real root". Thus dns resolution does not work. Of most interest was the MAAS use case of the 'root=http://<>/squashfs' use case. MAAS 2.3 uses this for the installation environment and also the rescue environment. In most cases the 14.04 specific fix will only apply to installation as 16.04 is most likely to be used in rescue mode. [Test Case] There are two tests for this. a.) local/non-MAAS test Download the test case attached. Run it and follow the instructions. Login to the guest (ubuntu:password), and inspect /etc/resolv.conf without the fix there would be no data in /etc/resolv.conf. With the fix you should see 'nameserver 10.0.2.2' and 'search mydomain.com bar.com' b.) MAAS test. For the full maas test, you need to build a image stream for maas with the fix included in the squashfs image and then import that stream to maas and use the rescue environment and verify dns. This process is beyond the scope of the SRU template, but is described partially in http://bazaar.launchpad.net/~maas-images-maintainers/maas-images/maas-ephemerals/view/head:/README [Regression Potential] Regression potential should be very low. There are gates in the code to make sure that this code is inactive other than when it is explicitly enabled. net-interface-handler will exit without doing anything unless: a.) there exist files /run/net-$INTERFACE.conf or /run/net6-$INTERFACE.conf and these files have non-empty values for a variable mentioned above. (These files are written by the initramfs code when 'ip=' is seen). b.) this is not a container. trusty uses 'running-in-container' to determine this. xenial uses 'systemd-detect-virt' c.) there is no OPENISCSI_MARKER file (/run/initramfs/open-iscsi.interface) if open-iscsi has written this file due to open-iscsi root, then it will handle this functionality. resolvconf will get out of the way. d.) /proc/cmdline contains cloud-config-url=* or 'rc-initrd-dns' This lowers the scope of changes in runtime to cases with where either the new flag is seen or cloud-config-url is passed. The MAAS use case will contain this flag. [Other Info] === End SRU Template === 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 http://paste.ubuntu.com/25342738/ 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 * bug 1730512: dns does not work in maas ephermer 14.04 system booted with rooturl. * bug 1735225: root=http:.. should automatically enable 'rc-initrd-dns' feature To manage notifications about this bug go to: https://bugs.launchpad.net/maas/+bug/1711760/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
