Nodes, Pods, Containers

• Viewing Pods and Nodes

Login a container

kubectl exec -it ${pod_name} -c ${container_name} -- /bin/bash

# login the default container
kubectl exec -it ${pod_name} -- /bin/bash

Resource Management for Pods and Containers

Resource Management for Pods and Containers

• Requests and limits

  • If the node where a Pod is running has enough of a resource available, it’s possible (and allowed) for a container to use more resource than its request for that resource specifies.

• CPU resource limit
  • 1.0 means 1 CPU unit (= 1 physical CPU core or 1 virtual core)
  • 1000m (one thousand millicpu) = 1.0

Namespaces

Namespaces provide a mechanism for isolating groups of resources within a single cluster.

Manage multiple clusters

• [Configure Access to Multiple Clusters]https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/

Links

• Kubernetes concepts
  • kubernetes doc
  • AWS EKS doc
• Switching contexts and namespaces: kubectl & kubens