Ubuntu and netplan

Question

I start playing with netplan.
What I apply is working, until I reboot.

Netplan YAML file reset and what I done is lost.

• How to keep my new configuration after reboot?
• Also, why if I set nameservers in the netplan file, when I do a nslookup, these new NS are not used?

Answer 1

@Patrice Brien Thank you for your patience over the matter!!!

I had discussion internally and below are the inputs I got :

It looks like DHCP is overwriting the Netplan file when rebooted. Please try below format.

network:  
version: 2  
renderer: networkd  
ethernets:  
 eno1:  
 dhcp4: no                                             #No DHCP  
 dhcp6: no                                             #No DHCP  
 addresses: [ 10.64.12.18/29 ]  
 nameservers:  
          addresses: [10.64.5.5,10.64.6.6]            #DNS IPs  
      routes:                                   #Static routes  
              - to: 10.0.0.0/8  
                via: 10.64.12.17  
    eno2:                                     #Second interface in this example  
      dhcp4: no                                               #No DHCP  
      dhcp6: no                                               #No DHCP  
      addresses: [ 104.44.223.89/26 ]  
      gateway4: 104.44.223.65                         #Default gateway in this case  

Also If you are looking for adding custom name servers alone its better to do it from Portal rather than updating from OS. When DHCP in place, any changes to all this files will get reset during reboot or refreshing the dhcp service.

If we need to add custom domain as well then use /etc/dhcp/dhclient.conf for both

Hope it helps!!!

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