1. Container Engine for Kubernetes
  2. Creating Network Resources
  3. Creating an OKE Control Plane Subnet

Creating an OKE Control Plane Subnet

Create the following resources in the order listed:

  1. Control plane security list

  2. Control plane subnet

Create a Control Plane Security List

To create a security list, use the instructions in "Creating a Security List" in Controlling Traffic with Security Lists in the Oracle Private Cloud Appliance User Guide. For Terraform input, see Example Terraform Scripts for Network Resources.

For this example, use the following input for the control plane subnet security list.

Compute Web UI property OCI CLI property

  • Name: kmi-seclist

  • --vcn-id: ocid1.vcn.oke_vcn_id

  • --display-name: kmi-seclist

Six ingress security rules:

Six ingress security rules:

--ingress-security-rules

Ingress Rule 1

  • Stateless: uncheck the box

  • Ingress CIDR: kube_client_cidr

  • IP Protocol: TCP

    • Destination Port Range: kubernetes_api_port

  • Description: "Allow inbound connections to the Kubernetes API server."

Ingress Rule 1

  • isStateless: false

  • source: kube_client_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 6

  • tcpOptions

    destinationPortRange

    • max: kubernetes_api_port

    • min: kubernetes_api_port

  • description: "Allow inbound connections to the Kubernetes API server."

Ingress Rule 2

  • Stateless: uncheck the box

  • Ingress CIDR: kmilb_cidr

  • IP Protocol: TCP

    • Destination Port Range: kubernetes_api_port

  • Description: "Allow inbound connections from the control plane load balancer."

 Ingress Rule 2

  • isStateless: false

  • source: kmilb_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 6

  • tcpOptions

    destinationPortRange

    • max: kubernetes_api_port

    • min: kubernetes_api_port

  • description: "Allow inbound connections from the control plane load balancer."

Ingress Rule 3

  • Stateless: uncheck the box

  • Ingress CIDR: worker_cidr

  • IP Protocol: TCP

    • Destination Port Range: 1024-65535

  • Description: "Allow inbound connections from worker nodes to the control plane."

 Ingress Rule 3

  • isStateless: false

  • source: worker_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 6

  • tcpOptions

    destinationPortRange

    • max: 65535

    • min: 1024

  • description: "Allow inbound connections from worker nodes to the control plane."

Ingress Rule 4

  • Stateless: uncheck the box

  • Ingress CIDR: kmi_cidr

  • IP Protocol: TCP

    • Destination Port Range: 1024-65535

  • Description: "Allow inbound connections within the control plane."

 Ingress Rule 4

  • isStateless: false

  • source: kmi_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 6

  • tcpOptions

    destinationPortRange

    • max: 65535

    • min: 1024

  • description: "Allow inbound connections within the control plane."

Ingress Rule 5

  • Stateless: uncheck the box

  • Ingress CIDR: worker_cidr

  • IP Protocol: UDP

    • Destination Port Range: 8285-8472

  • Description: "Allow flannel traffic."

 Ingress Rule 5

  • isStateless: false

  • source: worker_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 17

  • udpOptions

    destinationPortRange

    • max: 8472

    • min: 8285

  • description: "Allow flannel traffic."

Ingress Rule 6

  • Stateless: uncheck the box

  • Ingress CIDR: kmi_cidr

  • IP Protocol: UDP

    • Destination Port Range: 8285-8472

  • Description: "Allow flannel traffic."

 Ingress Rule 6

  • isStateless: false

  • source: kmi_cidr

  • sourceType: CIDR_BLOCK

  • protocol: 17

  • udpOptions

    destinationPortRange

    • max: 8472

    • min: 8285

  • description: "Allow flannel traffic."

Create the Control Plane Subnet

To create a subnet, use the instructions in Creating a Subnet in the Oracle Private Cloud Appliance User Guide. For Terraform input, see Example Terraform Scripts for Network Resources.

Use the following input to create the control plane subnet. Use the OCID of the VCN that was created in Creating an OKE VCN. Create the control plane subnet in the same compartment where you created the VCN.

Important:

The name of this subnet must be exactly "control-plane".

Compute Web UI property OCI CLI property

  • Name: control-plane

  • CIDR Block: kmi_cidr

  • Route Table: Select "Default - private" from the list

  • Private Subnet: check the box

  • DNS Hostnames:

    Use DNS Hostnames in this Subnet: check the box

    • DNS Label: kmi

  • Security Lists: Select "kmi-seclist" and "Default Security List for oketest-vcn" from the list

  • --vcn-id: ocid1.vcn.oke_vcn_id

  • --display-name: control-plane

  • --cidr-block: kmi_cidr

  • --dns-label: kmi

  • --prohibit-public-ip-on-vnic: true

  • --route-table-id: OCID of the "Default - private" route table

  • --security-list-ids: OCIDs of the "kmi-seclist" security list and the "Default Security List for oketest-vcn" security list