Assigning an application to a specific node (node affinity)

There are some use cases where Kubernetes clusters have different node pools with different specs, such as the following:

• Stateful applications
• Backend applications
• Frontend applications

Let's reschedule the nginx deployment to a dedicated node pool:

1. To get the nodes list, run the following command:

   $ kubectl get nodes

   The preceding command gives the following output:

   Figure 5.3 – Node pools list

2. Next, let's check a node under the gke-kubectl-lab-we-app-pool name. Run the following command:

   $ kubectl describe node gke-kubectl-lab-we-app-pool-1302ab74-pg34

   The output of the preceding command is as shown in the following screenshot:

   Figure 5.4 – Node labels

3. There, we have a node-pool=web-app label, which is the same for all nodes of the gke-kubectl-lab-we-app-pool pool.
4. Let's update the deployment.yaml file with the nodeAffinity rule, so the nginx application...