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New to Azure and trying to understand DNS resolution for Linux guests.

My VNET is set to two Windows DNS servers in Azure, when I add a Linux VM they are present and I can ping IP addresses and FQDN's in Azure and on-premise across the VPN.

So at the moment:

ping 1.1.1.1 - works
ping hosta.mydomain.com - works
ping hosta - does not work

Traditionally I get the last to work either via adding dns-search to interfaces or resolv.conf, but these are overwritten by Azure each reboot.

I have found that if I add the line

dns-search mydomain.com

to /etc/network/interfaces.d/50-cloud-init.cfg it works.

I am unsure if this is best practice as I have also seen this article "Azure Linux VM name resolution" suggest it should be done via /etc/dhcp/dhclient.conf.

Is someone able to advise what the best way to do this is, one that survives reboots and preferably survives changes at the Azure portal NIC blade?

Cheers

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When you reboot your VM, Azure VM waagent will rest /etc/resolve.conf file, so you will find the file is overwritten.

As S.Walker's link, you could use custom DNS server. You could do it on Azure Portal.

enter image description here

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  • If it works, please don't forget to accept it as an answer. It will help more people in the community. – Shui shengbao Nov 9 '17 at 2:14

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