IBM Cloud OpenShift ROKS 4.18 Cluster for BIG-IP Next for Kubernetes

About This Workspace

This Schematics-ready Terraform workspace provisions the IBM Cloud infrastructure required to run BIG-IP Next for Kubernetes on an IBM Cloud OpenShift ROKS 4.18 cluster. It creates the VPC, subnets, public gateways, COS instance, OpenShift cluster, and Transit Gateway needed to support BIG-IP Next for Kubernetes ingress and egress traffic flows.

Deploying with IBM Schematics

The following IBM provider and IAM variables must be defined.

Variable	Description	Required	Example
ibmcloud_api_key	API Key used to authorize all deployment resources.	REQUIRED	0q7N3CzUn6oKxEsr7fLc1mxkukBeAEcsjNRQOg1kdDSY (note: not a real API key)
ibmcloud_cluster_region	IBM Cloud region for cluster resources.	REQUIRED with default defined	ca-tor (default)
ibmcloud_resource_group	IBM Cloud resource group name. Leave empty to use the account default.	REQUIRED with default defined	default (default)

This deployment is modular and presents the following feature flag variables that control which components are orchestrated.

The deployment can orchestrate any or all of the following components:

Variable	Description	Required	Example
create_cluster	Create OpenShift ROKS cluster and its VPC infrastructure.	REQUIRED with default defined	true (default)
create_cos_instance	Create a Cloud Object Storage instance for the OpenShift internal image registry. Applies only when create_cluster is true.	REQUIRED with default defined	true (default)
create_transit_gateway	Create a Transit Gateway and connect the cluster VPC to it.	REQUIRED with default defined	true (default)

Deployment Variables — OpenShift ROKS Cluster

( Feature flags: create_cluster, create_cos_instance )

Variable	Description	Required	Example
cluster_vpc_name	Name of the cluster VPC to create or look up.	REQUIRED when create_cluster is true	tf-cluster-vpc (default)
openshift_cluster_name	Name of the OpenShift cluster to create.	REQUIRED when create_cluster is true	tf-openshift-cluster (default)
openshift_cluster_version	OpenShift version string. Leave empty to use the latest available version.	REQUIRED with default defined	4.18 (default)
workers_per_zone	Number of worker nodes per availability zone (3 zones are always used).	REQUIRED when create_cluster is true	1 (default)
min_worker_vcpu_count	Minimum vCPU count for worker node flavor auto-selection (bx2 series).	REQUIRED when create_cluster is true	16 (default)
min_worker_memory_gb	Minimum memory in GB for worker node flavor auto-selection (bx2 series).	REQUIRED when create_cluster is true	64 (default)
cos_instance_name	Name of the COS instance for the OpenShift registry.	Optional	tf-openshift-cos-instance (default)

Deployment Variables — Transit Gateway

( Feature flag: create_transit_gateway )

Variable	Description	Required	Example
transit_gateway_name	Name of the Transit Gateway to create.	REQUIRED when create_transit_gateway is true	tf-tgw (default)

Deployment Variables — Using an Existing Cluster VPC

If a cluster VPC already exists and should be used instead of creating a new one, set the following variables in the cluster module directly (via the modules/cluster variables).

Variable	Description	Required	Example
use_existing_cluster_vpc	Use an existing cluster VPC instead of creating one.	Optional	false (default)
existing_cluster_vpc_id	ID of the existing cluster VPC. Required when use_existing_cluster_vpc is true.	Conditional	r006-...

Project Directory Structure

ibmcloud_schematics_bigip_next_for_kubernetes_roks_cluster_4_18/
├── main.tf                    # Root module — wires variables into the cluster module
├── variables.tf               # Root module variable declarations
├── outputs.tf                 # Root module outputs
├── providers.tf               # IBM provider version constraint
├── terraform.tfvars.example   # Example variable values
└── modules/
    └── cluster/               # IBM Cloud OpenShift cluster infrastructure module
        ├── main.tf            # VPC, subnets, gateways, cluster, COS, Transit Gateway
        ├── variables.tf       # Cluster module variable declarations
        ├── outputs.tf         # Cluster module outputs
        └── providers.tf       # IBM provider version constraint for module

Resources Provisioned

The cluster module creates the following IBM Cloud resources:

Resource	Description
ibm_is_vpc.cluster_vpc	VPC for the OpenShift cluster
ibm_is_subnet.cluster_subnet_zone[1-3]	One /24 subnet per availability zone
ibm_is_public_gateway.cluster_gateway_zone[1-3]	Public gateway per zone for outbound internet access
ibm_is_subnet_public_gateway_attachment	Attaches each public gateway to its subnet
ibm_is_security_group_rule.cluster_sg_inbound_all	Allows all inbound traffic on the cluster VPC default security group
ibm_is_security_group_rule.cluster_tcp_80	Allows inbound TCP/80 on the OpenShift-managed kube-<cluster_id> security group
ibm_resource_instance.cos_instance	Cloud Object Storage instance for the OpenShift internal image registry
ibm_container_vpc_cluster.openshift_cluster	IBM Cloud OpenShift ROKS 4.18 cluster
ibm_tg_gateway.transit_gateway	IBM Cloud Transit Gateway with global routing enabled
ibm_tg_connection.cluster_vpc_connection	Connects the cluster VPC to the Transit Gateway

Worker node flavor is auto-selected as the smallest available bx2 profile that meets min_worker_vcpu_count and min_worker_memory_gb. The OpenShift version is auto-selected as the latest available unless openshift_cluster_version is set.

Local Installation & Deployment

Prerequisites

1. Terraform >= 1.0
2. IBM Cloud API key with sufficient IAM permissions to create VPC, OpenShift, COS, and Transit Gateway resources
3. Copy terraform.tfvars.example to terraform.tfvars and fill in your values

Recommended Deployment Order

The workspace has a single module so a targeted apply is not required. However, the cluster takes 60–90 minutes to provision.

Step 1: Initialize

terraform init

Step 2: Plan

terraform plan

Step 3: Apply (60–90 min)

terraform apply -auto-approve

Or target just the cluster infrastructure:

terraform apply -target=module.cluster -auto-approve

Cleanup

terraform destroy -auto-approve

Example terraform.tfvars

ibmcloud_api_key        = "YOUR_API_KEY"
ibmcloud_cluster_region = "ca-tor"
ibmcloud_resource_group = ""

# Feature flags
create_cluster         = true
create_transit_gateway = true
create_cos_instance    = true

# Cluster configuration
openshift_cluster_name    = "tf-openshift-cluster"
openshift_cluster_version = "4.18"
cluster_vpc_name          = "tf-cluster-vpc"
workers_per_zone          = 1
min_worker_vcpu_count     = 16
min_worker_memory_gb      = 64
cos_instance_name         = "tf-openshift-cos-instance"

# Transit Gateway configuration
transit_gateway_name = "tf-tgw"

Outputs

View all outputs after apply:

terraform output                                        # All outputs
terraform output roks_cluster_id                        # OpenShift cluster ID
terraform output openshift_cluster_public_endpoint      # Public API endpoint
terraform output roks_transit_gateway_id                # Transit Gateway ID
terraform output kubeconfig_file_path                   # Path to kubeconfig

Output	Description
roks_cluster_id	ID of the OpenShift cluster
roks_cluster_name	Name of the OpenShift cluster
openshift_cluster_id	ID of the OpenShift cluster (alias)
openshift_cluster_name	Name of the OpenShift cluster (alias)
openshift_cluster_public_endpoint	Public API server endpoint URL
openshift_cluster_private_endpoint	Private API server endpoint URL
openshift_cluster_ingress_hostname	Ingress hostname
openshift_cluster_state	Cluster state
openshift_cluster_crn	CRN of the OpenShift cluster
openshift_version_used	Resolved OpenShift version (useful when auto-detected)
available_openshift_versions	All available OpenShift versions in the cluster region
openshift_worker_zone1_ip	Worker node IP address in zone 1
openshift_worker_zone2_ip	Worker node IP address in zone 2
openshift_worker_zone3_ip	Worker node IP address in zone 3
roks_cluster_vpc_id	ID of the cluster VPC
roks_cluster_vpc_name	Name of the cluster VPC
roks_cluster_vpc_crn	CRN of the cluster VPC
roks_transit_gateway_id	ID of the Transit Gateway
roks_transit_gateway_name	Name of the Transit Gateway
roks_transit_gateway_crn	CRN of the Transit Gateway
roks_transit_gateway_location	Location of the Transit Gateway
roks_transit_gateway_global_routing	Whether global routing is enabled
transit_gateway_connections	Map of Transit Gateway connection names
kubeconfig_file_path	Path to the kubeconfig file (~/.kube/config)

Debugging & Troubleshooting

Validate configuration:

terraform validate
terraform state list

List resources in the cluster module:

terraform state list module.cluster

Common issues:

Issue	Solution
Cluster creation times out after 120 min	Check IBM Cloud status for regional incidents. Re-run terraform apply; the cluster resource will resume.
Error: no available zone	The min_worker_vcpu_count / min_worker_memory_gb combination may not match any bx2 flavor in the region. Lower the minimums or set worker_flavor explicitly.
COS instance quota exceeded	IBM Cloud allows one free COS instance per account. Set create_cos_instance = false and supply an existing COS instance, or remove the quota limit.
Transit Gateway connection pending	Transit Gateway connections can take several minutes to activate after the cluster VPC is attached. This is normal.