Creating a Virtual Cloud Network
Before you can launch an instance, you need to have a virtual cloud network (VCN) and subnet to launch it into. A subnet is a subdivision of your VCN. The subnet directs traffic according to a route table . For this tutorial, you'll access the instance over the internet using its public IP address, so your route table will direct traffic to an internet gateway. The subnet also uses a security list to control traffic in and out of the instance.
For information about VCN features, see Overview of Networking.
- You or an administrator has created a compartment for your network. See Choosing a Compartment.
The Console offers two choices when you create a VCN: to create only the VCN, or to create the VCN with several related resources that are necessary if you want to immediately launch an instance. To help you get started quickly, the following procedure creates the VCN plus the related resources.
Open the navigation menu. Under Core Infrastructure, go to Networking and click Virtual Cloud Networks.
Ensure that the Sandbox compartment (or the compartment designated for you) is selected in the Compartment list on the left.
- Click Networking Quickstart.
- Select VCN with Internet Connectivity, and then click Start Workflow.
- Enter the following:
- VCN Name: Enter a name for your cloud network. The name is incorporated into the names of all the related resources that are automatically created. Avoid entering confidential information.
- Compartment: This field defaults to your current compartment. Select the compartment you want to create the VCN and related resources in, if not already selected.
- VCN CIDR Block: Enter a valid CIDR block for the VCN. For example 10.0.0.0/16.
- Public Subnet CIDR Block: Enter a valid CIDR block for the subnet. The value must be within the VCN's CIDR block. For example: 10.0.0.0/24.
- Private Subnet CIDR Block: Enter a valid CIDR block for the subnet. The value must be within the VCN's CIDR block and not overlap with the public subnet's CIDR block. For example: 10.0.1.0/24.
- Accept the defaults for any other fields.
- Click Next.
- Review the list of resources that the workflow will create for you. Notice that the workflow will set up security list rules and route table rules to enable basic access for the VCN.
- Click Create to start the short workflow.
- After the workflow completes, click View Virtual Cloud Network.
The cloud network has the following resources and characteristics:
- Internet gateway.
- NAT gateway.
- Service gateway with access to the Oracle Services Network.
- A regional public subnet with access to the internet gateway. This subnet uses the VCN's default security list and default route table. Instances in this subnet may optionally have public IP addresses.
- A regional private subnet with access to the NAT gateway and service gateway. This subnet uses a custom security list and custom route table that the workflow created. Instances in this subnet cannot have public IP addresses.
- Use of the Internet and VCN Resolver for DNS.
This simple cloud network is designed to make it easy to launch an instance when trying out Oracle Cloud Infrastructure. When you create your production instances, ensure that you create appropriate security lists and route table rules to restrict network traffic to your instances.
Now you can launch an instance. See Launching a Linux Instance.