How to use a custom DNS

In some scenarios the default of using the system-provided DNS will not be sufficient. When that’s the case, you can use the --cloud-init option to the launch command, or modify the networking configuration after the instance started.

Contents:

The --cloud-init approach

To use a custom DNS in your instances, you can use this cloud-init snippet:

#cloud-config
bootcmd:
- printf "[Resolve]\nDNS=8.8.8.8" > /etc/systemd/resolved.conf
- [systemctl, restart, systemd-resolved]

Replace 8.8.8.8 with whatever your preferred DNS server is. You can then launch the instance using the following:

$ multipass launch --cloud-init systemd-resolved.yaml

The netplan.io approach

After the instance booted, you can modify the /etc/netplan/50-cloud-init.yaml file, adding the nameservers entry:

network:
  ethernets:
    ens3:
      dhcp4: true
      match:
        macaddress: 52:54:00:fe:52:ee
     set-name: ens3
     nameservers:
       search: [mydomain]
       addresses: [8.8.8.8]

You can then test it:

$ sudo netplan try
Do you want to keep these settings?


Press ENTER before the timeout to accept the new configuration


Changes will revert in 120 seconds
...

Last updated 15 hours ago.

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