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rated 0 times [  11] [ 0]  / answers: 1 / hits: 26557  / 2 Years ago, sat, february 12, 2022, 4:02:37

I am using focal Ubuntu 20.04.1 LTS (hosted virtual machine)


Occasionally after a reboot DNS resolution fails (e.g. ping google.com > Resource temporarily unavailable)


To 'fix' this I reboot the machine.


What is the proper fix and why is this occurring sporadically ?


The contents of resolv.conf indicates the file is being managed by systemd-resolved


# This file is managed by man:systemd-resolved(8). Do not edit.

#

# This is a dynamic resolv.conf file for connecting local clients directly to

# all known uplink DNS servers. This file lists all configured search domains.

#

# Third party programs must not access this file directly, but only through the

# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,

# replace this symlink by a static file or a different symlink.

#

# See man:systemd-resolved.service(8) for details about the supported modes of

# operation for /etc/resolv.conf.

# No DNS Servers known

example error:


wal@www:~$ ping google.com

ping: google.com: Resource temporarily unavailable

More From » networking
 Answers
2

If /etc/netplan is empty then netplan does not configure your network.


Your network is probably configured in old ifup/ifdown style.
That means you find the network configuration in /etc/network/interfaces.


In addition there is systemd-resolve with its DNS configuration file /etc/systemd/resolved.conf where you can put your DNS configuration in.


[Resolve]

DNS=8.8.4.4 8.8.8.8 2001:4860:4860::8844 2001:4860:4860::8888

#FallbackDNS=

Domains=example.com

#LLMNR=no

#MulticastDNS=no

#DNSSEC=no

#Cache=yes

#DNSStubListener=yes

You can check your DNS settings with


systemd-resolve --status

You can restart systemd-resolve with


systemctl restart systemd-resolved

Alternatively you can put your settings in /etc/resolvconf/resolv.conf.d/tail which will be added to /run/resolvconf/resolv.conf during boot.


[#2365] Saturday, February 12, 2022, 2 Years  [reply] [flag answer]
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