A public IP address is an IPv4 address that is reachable from the internet. If a resource in your tenancy needs to be directly reachable from the internet, it must have a public IP address. Depending on the type of resource, there might be other requirements.
There are two types of public IPs:
Ephemeral: Think of it as temporary and existing for the lifetime of the instance.
Reserved: Think of it as persistent and existing beyond the lifetime of the instance it's assigned to. You can unassign it and then reassign it to another instance whenever you like. Exception: reserved public IPs on public load balancers.
To create a new reserved public IP in your pool
Confirm you're viewing the region and compartment where you want to create the reserved public IP.
Open the navigation menu. Under Core Infrastructure, go to Networking and click Public IPs.
Click Create Reserved Public IP.
Enter the following:
Name: An optional friendly name for the reserved public IP. The name doesn't have to be unique, and you can change it later. Avoid entering confidential information.
Compartment: Leave as is.
Tags:Optionally, you can apply tags. If you have permissions to create a resource, you also have permissions to apply free-form tags to that resource. To apply a defined tag, you must have permissions to use the tag namespace. For more information about tagging, see Resource Tags. If you are not sure if you should apply tags, skip this option (you can apply tags later) or ask your administrator.
Click Create Reserved Public IP.
To assign a reserved public IP to a private IP
Prerequisite: The private IP must not have an ephemeral or reserved public IP already assigned to it. If it does, first delete the ephemeral public IP, or unassign the reserved public IP.
Confirm you're viewing the compartment that contains the instance with the private IP you're interested in.
Open the navigation menu. Under Core Infrastructure, go to Compute and click Instances.
Click the instance to view its details.
Under Resources, click Attached VNICs.
The primary VNIC and any secondary VNICs attached to the instance are displayed.
Click the VNIC you're interested in.
Under Resources, click IP Addresses.
The VNIC's primary private IP and any secondary private IPs are displayed.
For the private IP you're interested in, click the Actions icon (three dots), and then click Edit.
In the Public IP Address section, for Public IP Type, select the radio button for Reserved Public IP.
Enter the following:
Compartment: The compartment that contains the reserved public IP you want to assign.
Reserved Public IP: The reserved public IP you want to assign. You have three choices:
Create a new reserved public IP. You may optionally provide a friendly name for it. The name doesn't have to be unique, and you can change it later. Avoid entering confidential information.
Assign a reserved public IP that is currently unassigned.
Move a reserved public IP from another private IP.
Click Update.