Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
8,283 questions
How to update the DNS records on Azure RHEL VM?
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Arunprasad K
20
Reputation points
Hi All,
We have some RHEL 7.9, SUSE sles 15 and Windows 2016 servers in our environment where we recently changed the DNS servers in Azure vnet. After DNS change Windows servers get update automatically.
Linux servers don't get the update. I found this https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/linux/custom-dns-configuration-for-azure-linux-vms?tabs=RHEL. Following this I ran "sudo netconfig update" and "sudo systemctl restart wicked.service". It change the records in SUSE servers.
But RHEL servers is not getting the updates after running "sudo systemctl restart NetworkManager". I see the old DNS only /etc/resolv.conf. Then I checked /run/NetworkManager/resolv.conf it's having the correct DNS. And I ran "nmcli dev show" it's also having the correct ones.
Should I need to link /run/NetworkManger/resolv.conf and /etc/resolv.conf or should I leave them as it is?
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Mounika Reddy Anumandla 1,955 Reputation points Microsoft Vendor2025-01-27T07:08:12.2166667+00:00 Hi Arunprasad K,
Welcome to the Microsoft Q&A Platform. Thank you for posting your query here.
As per my understanding, linking
/run/NetworkManager/resolv.confand/etc/resolv.confis generally may not be necessary if your system is already managing DNS resolution correctly.
I have reproduced your scenario and tried to update the dns of RHEL server by following the steps in the documentation mentioned and it worked.The initial configuration of the
/etc/resolv.conffile in an Azure Linux VM is as shownConfigured custom DNS servers at the Azure virtual network or network interface level.
Restart the
NetworkManagerservice,and then check the/etc/resolv.conffile. This file reflects the new DNS settings configured in the VNetCan you please confirm if you have followed above steps and can you please confirm If
dhclientis responsible for DNS management orNetworkManagerto manage DNS.To check this open the
NetworkManager.conffile and check [main] dns=default.If the comment is helpful, please click "upvote" to let us know.
Let me know if you have any further queries!
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