search domains missing in /etc/resolv.conf

[ani-sinha]

I have a json network config that reads like this:

{
 "config": [
  {
   "mac_address": null,
   "name": "eth0",
   "subnets": [
    {
     "address": "10.37.200.128",
     "dns_nameservers": [
      "10.37.200.1"
     ],
     "dns_search": [
      "example.com"
     ],
     "gateway": "10.37.201.254",
     "ipv4": true,
     "netmask": "255.255.254.0",
     "type": "static"
    }
   ],
   "type": "physical"
  },
  {
   "address": "10.37.200.1",
   "type": "nameserver"
  }
 ],
 "version": 1
}

I expect to see example.com in the search domain in /etc/resolv.conf. Yet its missing!

$ cat /etc/resolv.conf 
; Created by cloud-init automatically, do not edit.
;
nameserver 10.37.200.1

but the interface ifcfg config file has it:

$ cat /etc/sysconfig/network-scripts/ifcfg-eth0 
# Created by cloud-init automatically, do not edit.
#
AUTOCONNECT_PRIORITY=120
BOOTPROTO=none
DEFROUTE=yes
DEVICE=eth0
DNS1=10.37.200.1
DOMAIN=example.com
GATEWAY=10.37.201.254
IPADDR=10.37.200.128
NETMASK=255.255.254.0
ONBOOT=yes
TYPE=Ethernet
USERCTL=no

The problem here is what I understand is that https://cloudinit.readthedocs.io/en/21.1/topics/network-config-format-v1.html#nameserver is getting populated into resolv.conf but not the subnet configuration presented per interface basis. Looking at https://cloudinit.readthedocs.io/en/21.1/topics/network-config-format-v1.html#subnet-ip , dns_search and dns_nameservers should end up in /etc/resolv.conf . I think sysconfig renderer needs fixing . I will try to cook up a patch.