How to Permanently Change Hostname in Oracle Cloud Infrastructure (OCI) Compute Environment on Oracle Linux

By design, changes made in the /etc/hosts and resolv.conf files revert to their original values, after an instance restart, unless these steps are implemented.

 

SOLUTION

For Oracle Linux: (prior to Version 7)

1: Edit /etc/sysconfig/network

change the parameter value for "hostname"

example:

# cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=instance-ol6 <--------- change here

2: In the file /etc/oci-hostname.conf change the value of PRESERVE_HOSTINFO to 2.

/etc/oci-hostname.conf

PRESERVE_HOSTINFO=2

This change will be persistent across reboots.

For Oracle Linux 7 :

Steps to be followed in order to change the hostname on oel7 server persistently hosted on OCI environment.

1: Update the /etc/hostname file with below command.

    hostnamectl set-hostname <new name>

2: Edit the oci configuration file for hostnames as given below to update the needed value to 2.

    vi /etc/oci-hostname.conf

    PRESERVE_HOSTINFO=2

    save the changes.

3: Edit the FQDN from OCI console GUI

go to compute instances

--> select the instance

--> scroll down

--> at the left bottom corner select attached VNIC under resources

--> edit appropriate VNIC

--> change hostname to update FQDN

--> update VNIC

OCI Instance VNIC Attachments

OCI Instance VNIC hostname change

4: Reboot the instance

Testing:

1: Check the hostname with hostname command.

2: Check if FQDN is resolving.

    host <ip adress>

      or

    nslookup <ip adress>

How to make Permanent change in OCI: System Files /etc/resolv.conf