Setting custom DNS suffix on Azure CentOS VMs

Greg Dickinson 1 Reputation point
2021-12-15T13:49:22.463+00:00

I have a few Linux VMs on different VNETs in Azure that I need to do hostname resolution on. For VMs in the same VNET this works using the default settings, obviously. I set up a private DNS zone and linked the VNETs to it, and I can do FQDN DNS resolution between them (hostname.cloud.local) but I need to find a way to add the private DNS suffix to the CentOS configuration. Normally I would just add it to /etc/sysconfig/network but this seems to be overwritten by cloud-init every boot.

I've not used cloud-init much, mainly re-using premade configs. How would I go about adding my private DNS suffix to the networking configuration on these VMs?

Azure DNS
Azure DNS
An Azure service that enables hosting Domain Name System (DNS) domains in Azure.
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  1. Arnout Van hulle 1 Reputation point
    2022-02-01T14:45:11.267+00:00

    Hi, I have the same problem. Would there be a way to configure the DNS suffix on Azure CentOS VMs (or Linux VMs in general)? It does indeed look like the network settings are being overwritten by Azure on reboot.

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