Public bug reported:
When deploying Bionic, /etc/resolv.conf is not configured correctly,
which leads to no DNS resolution. In the output below, you will see that
netplan config is correctly to the 10.90.90.1 nameserver, but in
resolv.conf that's a local address.
Resolv.conf should really be configured to use the provided DNS
server(s). That said, despite that fact, DNS resolution doesn't work
with the local address.
Bionic
------
ubuntu@node01:~$ 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:
enp0s25:
match:
macaddress: b8:ae:ed:7d:17:d2
mtu: 1500
nameservers:
addresses:
- 10.90.90.1
search:
- maaslab
- maas
set-name: enp0s25
bridges:
br0:
addresses:
- 10.90.90.3/24
gateway4: 10.90.90.1
interfaces:
- enp0s25
parameters:
forward-delay: 15
stp: false
ubuntu@node01:~$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search maaslab maas
ubuntu@node01:~$ ping google.com
ping: google.com: Temporary failure in name resolution
[...]
ubuntu@node01:~$ sudo vim /etc/resolv.conf
ubuntu@node01:~$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 10.90.90.1
search maaslab maas
ubuntu@node01:~$ ping google.com
PING google.com (172.217.0.174) 56(84) bytes of data.
64 bytes from mia09s16-in-f14.1e100.net (172.217.0.174): icmp_seq=1 ttl=52
time=4.46 ms
64 bytes from mia09s16-in-f14.1e100.net (172.217.0.174): icmp_seq=2 ttl=52
time=4.38 ms
=============================
Xenial
==============================
ubuntu@node05:~$ 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
dns-nameservers 10.90.90.1
dns-search maaslab maas
auto enp0s25
iface enp0s25 inet static
address 10.90.90.162/24
gateway 10.90.90.1
mtu 1500
ubuntu@node05:~$ 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 10.90.90.1
search maaslab maas
** Affects: cloud-init
Importance: Undecided
Status: New
** Affects: maas
Importance: Undecided
Status: Invalid
** Affects: nplan (Ubuntu)
Importance: Critical
Status: New
** Affects: systemd (Ubuntu)
Importance: Critical
Status: New
** Also affects: cloud-init
Importance: Undecided
Status: New
** Also affects: nplan (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nplan (Ubuntu)
Importance: Undecided => Critical
** Changed in: systemd (Ubuntu)
Importance: Undecided => Critical
** Changed in: maas
Status: New => Incomplete
** Changed in: maas
Status: Incomplete => Invalid
** Description changed:
When deploying Bionic, /etc/resolv.conf is not configured correctly,
which leads to no DNS resolution. In the output below, you will see that
netplan config is correctly to the 10.90.90.1 nameserver, but in
resolv.conf that's a local address.
+ Resolv.conf should really be configured to use the provided DNS
+ server(s)
Bionic
------
ubuntu@node01:~$ 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:
- enp0s25:
- match:
- macaddress: b8:ae:ed:7d:17:d2
- mtu: 1500
- nameservers:
- addresses:
- - 10.90.90.1
- search:
- - maaslab
- - maas
- set-name: enp0s25
- bridges:
- br0:
- addresses:
- - 10.90.90.3/24
- gateway4: 10.90.90.1
- interfaces:
- - enp0s25
- parameters:
- forward-delay: 15
- stp: false
+ version: 2
+ ethernets:
+ enp0s25:
+ match:
+ macaddress: b8:ae:ed:7d:17:d2
+ mtu: 1500
+ nameservers:
+ addresses:
+ - 10.90.90.1
+ search:
+ - maaslab
+ - maas
+ set-name: enp0s25
+ bridges:
+ br0:
+ addresses:
+ - 10.90.90.3/24
+ gateway4: 10.90.90.1
+ interfaces:
+ - enp0s25
+ parameters:
+ forward-delay: 15
+ stp: false
ubuntu@node01:~$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search maaslab maas
=============================
Xenial
==============================
- ubuntu@node05:~$ cat /etc/network/interfaces.d/50-cloud-init.cfg
+ ubuntu@node05:~$ 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
- dns-nameservers 10.90.90.1
- dns-search maaslab maas
+ dns-nameservers 10.90.90.1
+ dns-search maaslab maas
auto enp0s25
iface enp0s25 inet static
- address 10.90.90.162/24
- gateway 10.90.90.1
- mtu 1500
- ubuntu@node05:~$ cat /etc/resolv.conf
+ address 10.90.90.162/24
+ gateway 10.90.90.1
+ mtu 1500
+ ubuntu@node05:~$ 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 10.90.90.1
search maaslab maas
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https://bugs.launchpad.net/bugs/1750884
Title:
[2.4, bionic] /etc/resolv.conf not configured correctly in Bionic,
leads to no DNS resolution
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