node - compute unit virtual/physical machine

each node is running a “kubelet”

1 master node

• API server
• controller
• scheduler
• etcd
• virtual network

several (worker) nodes

Docker containers run on worker nodes

pod

• abstraction over a container
• smallest unit in k8s
• usually 1 app per pod, e.g. mongo DB, redis, our app
• can have several pods per node