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System Files /etc/hosts and /etc/resolv.conf Changed During Boot

edited Mar 11, 2025 9:23AM in Linux

Applies To:

Oracle Cloud Infrastructure

Linux x86-64

Symptoms:

The system files /etc/hosts and /etc/resolv.conf file were changed during boot, loosing customization.

Cause:

By default, OCI services and dhclient will set /etc/hosts and /etc/resolv.conf at boot.

Solution:

To prevent the system to modify the hostname and the /etc/hosts change the setting file /etc/oci-hostname.conf to:

PRESERVE_HOSTINFO=2

Even with this setting, /etc/resolv.conf will still be re-written during boot with this setting.

To prevent changes to this file, the /etc/resolv.conf need to have the following content: docs.cloud.oracle.com

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