What is the maximum number of nodes, pods, modules, and containers that can be placed in one cluster?

Maximum limits in a Kubernetes cluster depend on various factors, primarily on the Control Plane configuration and the infrastructure used.

Typical constraints:

• Nodes: Up to 5000.
• Pods: Up to 150,000.
• Containers: Up to 300,000.
• Pods per node: Up to 250.

It is important to understand that these figures are theoretical and may be lower in practice due to resource shortages, network limitations, etcd performance, and other Control Plane components.

To increase limits, horizontal scaling of the Control Plane, configuration optimization, and ensuring sufficient resources are required.

# Example API request that can show current limits
apiVersion: v1
kind: ResourceQuota
metadata:
  name: object-counts
spec:
  hard:
    pods: "10"
    replicationcontrollers: "5"
    resourcequotas: "1"
    secrets: "10"
    configmaps: "10"
    persistentvolumeclaims: "4"
    services: "5"
    services.nodeports: "2"
    services.loadbalancers: "1"

Actual limits for a specific cloud provider or on-premise installation may differ. Always refer to the documentation of the platform used.