OLVM: Cloud Init DNS Search Entry Missing in /etc/resolv.conf of Guest VMs (Doc ID 2732792.1)

Last updated on OCTOBER 01, 2021

Applies to:

Symptoms

On : Oracle Linux 7.8 with Unbreakable Enterprise Kernel [4.14.35] version, Oracle Linux Virtualization Manager(OLVM)

When DNS search domain is configured using cloud init in Admin portal to create new VMs with initial configuration, the guest VM's search-entry is always missing in /etc/resolv.conf and it has to be added manually but no issue is seen with DNS entries in nic's network configuration:

# cat /etc/resolv.conf
; Created by cloud-init on instance boot automatically, do not edit.
;                              <<<<<<<<<<<<<<<<<<<<< no entry as "search in <DOMAIN>" mentioned in cloud-init 
# Generated by NetworkManager
nameserver 10.XX.XX.19
nameserver 10.XX.XX.18
 

Example config for nic interface:

# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Created by cloud-init on instance boot automatically, do not edit.
#
BOOTPROTO=none
DEFROUTE=yes
DEVICE=eth0
DNS1=10.XX.XX.19
DNS2=10.XX.XX.18
DOMAIN=<DOMAIN>
GATEWAY=<GATEWAY>
IPADDR=xx.xx.xx.xx
NETMASK=xxxxxx
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
 

This is not expected and search-entry must appear in /etc/resolv.conf

Cause

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