148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

Chapter 10 ■ Configuring Compute Resources
Limit on Number of Pods
The number of pods that can be scheduled on a node is limited by the allocable node capacity, which
includes the limit of 110 on the number of pods. To demonstrate, scale the RC to 400 pods. The RC is scaled
to 400 replicas and no error is generated, as shown in Figure 10-18.
Figure 10-18. Scaling to 400 nodes
But 400 pods cannot run on three nodes; this is limited not only by the limit on the number of pods per
node but also by the allocable CPU and memory. The pods that cannot run are put in Pending status and no
node is allocated to them, as shown in Figure 10-19.
Figure 10-19. Pods put in Pending status
Scale the RC back to five replicas. The Pending pods are not immediately removed. But five running
pods are listed, as shown in Figure 10-20.
252