Creating Compartment & VCN (Subnet, Route Table, Internet Gateway, Security List, DHCP) In OCI

 

In this post I would explain how you can start your OCI journey from scratch. You will get to know the requirement for building architecture like - creating and configuring compartment, VCN, policies, etc. So that you can build your first OCI Instances.

v  Creating a Compartment in Oracle Cloud Infrastructure (OCI)

 

As given below let us have a look at following steps:

 

Step 1: Login to Oracle Cloud Infrastructure

 

Step 2: Select Compartment Menu

Click on hover over Identity option and click on Compartments

 

Step 3: Click on Create Compartment button.

Once inside Compartments menu, you will see “Create Compartment” button.

 

 

Step 4: Fill Compartment Details and Create Compartment.

 

Note:-  Following rules need to be followed related to compartment creation:   (i) Compartment name can contain only alphanumeric characters, along with periods, hyphens and underscores. (Spaces are not allowed in compartment names). (ii)Compartment name can contain only alphanumeric characters, along with periods. Hyphens and underscores (spaces are not allowed in compartment names). (iii) Compartment name can be up to 100 characters long. (iv) Compartment name should be unique within its parent compartment. (v) Compartment description can be up to 400 characters long. (vi) Compartments can be created up to 6 levels deep, not beyond that.

 

 

Now your Compartment is created..!! You should be able to see your newly created compartment in the list of compartments.

 

 

v Creating a Virtual Cloud Network (VCN) in OCI

 

There are two options for creating VCN in OCI:

 

(I) Create Virtual Cloud Network plus related resources: Automatically sets up a Virtual Cloud Network with access to the internet. You can set up firewall rules and Security Lists to control ingress and egress traffic to your Instances.

All related resources will be created in the same Compartment as the VCN.

 

 

(II) Create Virtual Cloud Network only: Creates a Virtual Cloud Network only.

 You’ll still need to set up at least one subnet, gateway and route rule to have a working Virtual Cloud Network.

 

 

 

Step 1: Open the Console and in Menu, click Networking.

Select Create Virtual Cloud Network Only. (This option will not create the related resources like -subnet, route table,Internet Gateway, security List, DHCP Options)

 

 

 

 

 

 

 

 

Step 2: Select a compartment on the left that you have permission to work in.

 

Step 3: Click Create virtual cloud network.

Note: Enter a friendly name for the cloud network. It doesn’t have to be             unique,and it cannot be changed later in the Console.

 

Now our VCN is created..!!

Ø Creating Security List

At First, I’m going to show you how to add Ingress rule in the default security list in VCN-T1 after that we will create two new security list for public & private subnet.

 

Step 1:

On the Resources menu, click Security Lists. Click on the Default Security List.

 

 

            Step 2:

Click on -> Add Ingress Rule and add the following values as shown below:  Source Type: CIDR Source CIDR: 0.0.0.0/0 IP Protocol: TCP Source Port Range: All Destination Port Range: 80 Click on Add Ingress Rules at the bottom (as per below Screenshot).

ü  Note: A default Security List was created for this VCN, but we will not use it.

  

Ø  We will create two new Security Lists, one for the public subnet and one for the    private subnet. This way, we can control the types of traffic (protocol and port) will be allowed in and out of the instances in public and private subnets.

        

 Step 1: To create a new Security List, on the Resources menu, click Security Lists.

Step 2: The Create Security List dialog box, use the information below:

(i) Name: Private-Security-List Create In Compartment: The compartment name (e.g. Training)   Click + Another Ingress Rule, use the information below:   Source Type: CIDR Source CIDR: 0.0.0.0/0 IP Protocol: TCP Destination Port Range: 22

(ii) Click + Another Egress Rule, use the information below and click Create Security List:   Source Type: CIDR Source CIDR: 0.0.0.0/0 IP Protocol: TCP Destination Port Range: All

(iii) Click Create Security List.   The Security Lists were created..!!

Step 3: Click Create Security List again.

(i) Name: Public-Security-List Create In Compartment: The compartment name (e.g. Training)   Click + Another Ingress Rule, use the information below:   Source Type: CIDR Source CIDR: 0.0.0.0/0 IP Protocol: TCP Destination Port Range: 22

(ii) Click + Another Egress Rule, use the information below and click Create Security List:   Source Type: CIDR Source CIDR: 0.0.0.0/0 IP Protocol: TCP Destination Port Range: All

(iii) Click Create Security List.   The Security Lists were created..!!

v  Create Internet Gateway in Oracle Cloud Infrastructure (OCI)

Step 1: Click Create Internet Gateway.

Step 2: In the Create Internet Gateway dialog box, use the information below and click Create Internet Gateway:

Name: internet-gateway1

Create In Compartment: The compartment name (e.g. Training)

v  Now, Creating Route Table in Oracle Cloud Infrastructure (OCI)

Step 1: Click Create Route Table

In the Create Route Table dialog box, use the information below:

Step 2: Click + Additional Route Rule, use the information below and click Create Route Table:

Name: Route_Table_VCN-T1 Compartment: The compartment name (e.g. Training) Target Type: Internet Gateway Destination CIDR Block: 0.0.0.0/0

Step 3: Click on Create Route Table.

The Route Tables were created!!

v  Creating Subnets in Oracle Cloud Infrastructure (OCI)

 

Subnets are logical divisions of a virtual cloud network. We can create one or more subnets in a VCN each of which has a range of non-overlapping IP addresses. This range of address is determined by CIDR blocks.

 

Step 1: Select Virtual Cloud Networks Menu, hover over Networking option and click on Virtual Cloud Networks.

 

Step 2: Select correct VCN’s compartment.

 

Step 3: Click on VCN name

After you select correct compartment, scroll up to find list of VCNs in that compartment.

 

You should be able to see your existing VCN in it. Click on the Name of the VCN to navigate to VCN page.

Step 4: Click on Create Subnet button.

           Step 5: Enter details and Create PUBLIC Subnet

NAME: PUBLIC-SUBNET-VCN-T1 SUBNET TYPE: REGIONAL (RECOMMENDED) CIDR BLOCK: 172.168.0.0/24 ROUTE TABLE: Route_Table_VCN-T1 SUBNET ACCESS: PUBLIC SUBNET DHCP OPTIONS: Default DHCP option for VCN-T1 SECURITY LIST: Public-Security-List / Default security List

 Step 6: Enter details and Create PRIVATE Subnet

NAME: PRIVATE-SUBNET-VCN-T1 SUBNET TYPE: REGIONAL (RECOMMENDED) CIDR BLOCK: 172.168.1.0/24 ROUTE TABLE: Route_Table_VCN-T1 SUBNET ACCESS: PRIVATE SUBNET DHCP OPTIONS: Default DHCP option for VCN-T1 SECURITY LIST: Public-Security-List / Default security List

Step 6: Validate Subnet Created

You should be able to see the newly created subnet under list of subnets in the VCN.

 

So, now you are ready to create you’re Compute Instance in Oracle Cloud Infrastructure (OCI)..!!