1.2 Creating an OKE Cluster

Create a cluster in Quick mode

As the first step to create the OKE cluster, a custom environment such as a separate OKE user and VCN will be used in the real environment, but as the first step to understand OKE, install it in Quick mode through the Administrator user.

1. Log in to the OCI console.

2. Go to Developer Services > Containers & Artifacts > Kubernetes Clusters (OKE) from the top left hamburger menu.

3. In List Scope, select the Compartment you want to create (eg oke-labs).

4. Click the Create Cluster button to create a cluster.

5. To understand the mood structure through OKE clusters created using the default Quick Create mode for quick cluster creation. Click Launch Workflow below.

   

Cluster Creation Options

1. Enter the cluster name to be created. Ex) oke-cluster-1

2. Select the compartment to be installed. yes oke-labs

3. Choose the Kubernetes version for your cluster. Ex) v1.20.11

4. Kubernetes API Endpoints

   • Use the default Public Endpoint for access to the public API
   • Select whether to open the Kubernetes API as a private IP or a public IP. When installed with Quick Create, your choice determines whether the subnet where the Kubernetes API is located is set to be a Private Subnet or a Public Subnet.

5. Kubernetes Worker Nodes

   • Select a method to connect to Worker Nodes. Use the default selected Private Worker
   • Select whether to open the created Worker Nodes with Private IP or Public IP. When installed with Quick Create, the choice determines whether the subnet where the Worker Nodes are located is set as Private Subnet or Public Subnet.

   

6. Shape Specifies the VM Shape to be used as a Worker Node. Adjust OCPU and Memory as needed in the default selected Flex Shape.

   

7. Number of nodes

   Specifies the number of Worker Nodes. The default value is three.

8. Control Planes (Master Nodes)

   Control Plane is an area managed by OCI and cannot be specified separately, and is multiplexed by default.

9. Advanced Options

   • Add an SSH Key
     • SSH Key registration is required to access the Worker Node VM for troubleshooting, etc. Register the public key of the SSH key to be used as follows.

   

10. You have entered all cluster creation information. Click Next below

11. After reviewing the previously entered values, click Create Cluster.

12. Cluster Creation and Related Network Resources

    As shown in the figure below, when creating a cluster with Quick Create, you can see that basic network resources are created together.

    

Confirm cluster creation

1. When creation is requested, cluster creation, node pool creation, and worker node creation and configuration are performed in the following order.

2. You can see the created pool by going to Resources > Node Pools in the cluster details.

   

3. Click pool1, which is the created Node Pool, to go to Node Pool details.

4. You can check the created Worker Nodes by looking at Resources > Nodes information in Node Pool details. After the VM is created, there is some time to configure Kubernetes, so it will take some time to get ready. In the test environment, it took about 5-6 minutes until all the nodes were ready.

   

Verify cluster and network configuration

Quick Create & Public Endpoint & Private Workers

For Kubernetes API Endpoint, Worker Nodes, and Service Load Balancer, as in the example described in [Example Network Resource Configurations] (https://docs.oracle.com/en-us/iaas/Content/ContEng/Concepts/contengnetworkconfigexample.htm) Several configurations are possible, combining private or public subnets. Here, as before, Public Endpoint and Private Workers are selected in Quick Create mode. The default service load balancer is Public, and can be selected when creating a load balancer in Kubernetes.