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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1750884 Title: [2.4, bionic] /etc/resolv.conf not configured correctly in Bionic, leads to no DNS resolution To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-init/+bug/1750884/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs