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OCI: Ubuntu Instance /etc/resolv.conf Is Overwritten at Boot Time

edited Sep 24, 2023 11:41AM in Linux

Applies To:

Oracle Cloud Infrastructure - Version N/A and later

Linux x86-64


/etc/resolv.conf custom entries get overwritten during boot.


Made an nameserver entry of (a public DNS server on the internet) in /etc/resolv.conf, next day its gets automatically removed.


This file is managed by systemd-resolved which overwrites the file to default value upon reboot or "netplan apply".

$ sudo cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.

The manual page systemd-resolved.service(8) describes:

       Four modes of handling /etc/resolv.conf (see resolv.conf(5)) are supported:

       ·   systemd-resolved maintains the /run/systemd/resolve/stub-resolv.conf file for compatibility with traditional Linux
           programs. This file may be symlinked from /etc/resolv.conf. This file lists the DNS stub (see above) as
           the only DNS server. It also contains a list of search domains that are in use by systemd-resolved. The list of
           search domains is always kept up-to-date. Note that /run/systemd/resolve/stub-resolv.conf should not be used directly
           by applications, but only through a

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