Ubuntu and netplan

Question

Ubuntu and netplan

Patrice Brien 26

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?

JimmyYang-MSFT 58,641 Reputation points Microsoft External Staff

2021-09-10T07:53:00.057+00:00

Hi @Patrice Brien

Do you make the netplan in Microsoft Teams in Linux?

What is your version of Ubuntu?
Patrice Brien 26 Reputation points

2021-09-10T13:03:30.847+00:00
Netplan in Microsof Teams? (Sorry don't understand ou question)

Ubuntu 20.04LTS
JimmyYang-MSFT 58,641 Reputation points Microsoft External Staff

2021-09-15T05:36:40.087+00:00

Hi @Patrice Brien

I start playing with netplan.

Sorry, I don't understand what is your meaning of netplan? And I also curious about if this netplan is related to Teams for Linux?
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-21T07:01:04.763+00:00

@Patrice Brien Can you please provide inputs as per ask so we can help you better?

Thanks
Patrice Brien 26 Reputation points

2021-09-21T12:19:08.327+00:00
T think the question is very easy to understand.

Even if I give you input, it wont help you.

Here is netplan configuration look like: (Not mine, it is juste an example)

network:
version: 2
renderer: networkd
ethernets:
en01:
addresses:

192.168.1.25/24

"2001:1::1/64"
gateway4: 192.168.1.1
gateway6: "2001:1::2"
nameservers:
addresses:

8.8.8.8

8.8.4.4

If I decide to change DNS 8.8.8.8 to 1.1.1.1, on an server hosted by Azure, after reboot you will lose the 1.1.1.1 and return to 8.8.8.8

I mean every thing I do in netplan on a server hosted on Azure. I lose my netplan config.
So not possible to setup a static route in there.

But the same changes in an server hosted on my laptop under Virtualbox work.
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-21T14:52:04.797+00:00

@Patrice Brien Thank you for responding back. Let me check internally on this and I will keep you posted once I have an update.

Thanks
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-27T13:40:01.823+00:00

@Patrice Brien Any updates on the issue?

Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.

Thanks

Accepted answer

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Your answer

JimmyYang-MSFT 58,641 Reputation points Microsoft External Staff

2021-09-10T07:53:00.057+00:00

Hi @Patrice Brien

Do you make the netplan in Microsoft Teams in Linux?

What is your version of Ubuntu?
Patrice Brien 26 Reputation points

2021-09-10T13:03:30.847+00:00

Netplan in Microsof Teams? (Sorry don't understand ou question)

Ubuntu 20.04LTS
JimmyYang-MSFT 58,641 Reputation points Microsoft External Staff

2021-09-15T05:36:40.087+00:00

Hi @Patrice Brien

I start playing with netplan.

Sorry, I don't understand what is your meaning of netplan? And I also curious about if this netplan is related to Teams for Linux?
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-21T07:01:04.763+00:00

@Patrice Brien Can you please provide inputs as per ask so we can help you better?

Thanks
Patrice Brien 26 Reputation points

2021-09-21T12:19:08.327+00:00

T think the question is very easy to understand.

Even if I give you input, it wont help you.

Here is netplan configuration look like: (Not mine, it is juste an example)

network:
version: 2
renderer: networkd
ethernets:
en01:
addresses:

192.168.1.25/24

"2001:1::1/64"
gateway4: 192.168.1.1
gateway6: "2001:1::2"
nameservers:
addresses:

8.8.8.8

8.8.4.4

If I decide to change DNS 8.8.8.8 to 1.1.1.1, on an server hosted by Azure, after reboot you will lose the 1.1.1.1 and return to 8.8.8.8

I mean every thing I do in netplan on a server hosted on Azure. I lose my netplan config.
So not possible to setup a static route in there.

But the same changes in an server hosted on my laptop under Virtualbox work.
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-21T14:52:04.797+00:00

@Patrice Brien Thank you for responding back. Let me check internally on this and I will keep you posted once I have an update.

Thanks
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-27T13:40:01.823+00:00

@Patrice Brien Any updates on the issue?

Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.

Thanks

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!!!

Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.

Patrice Brien 26 Reputation points

2021-09-28T01:53:21.03+00:00

DHCP was an example.
Static route, DHCP, etc, everything is erased after reboot when netplan is used under Azure

For my stactic route, I use @REBOOT in cron to execute a script that creat the route at reboot.
prmanhas-MSFT 17,946 Reputation points Microsoft Employee Moderator

2021-09-28T06:57:05.757+00:00

@Patrice Brien Yes, all this network settings would get reset on reboot as we configure DHCP as default.

For static route can you please add in /etc/rc.local file which would get added whenever server reboots.

Like below (without those #)

Hope it helps!!!

Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.

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Ubuntu and netplan

Here is netplan configuration look like: (Not mine, it is juste an example)

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