kubernetes tutorial | Scheduling Pods to Nodes | Node Affinity | Demo

*Certified Kubernetes Administrator* ------------------------------------------------------------ kubernetes tutorial | Scheduling Pods to Nodes | Node Affinity | Demo *Description* ---------------------- In this video, you are going to learn the concepts of Scheduling pods to nodes using Node Affinity and we are also going to see a demo on the same as well. *Kubernetes - Scheduling Pods to Nodes using NodeAffinity* --------------------------------------------------------------------------------------------------- 1. Scheduling Pods to Nodes using “Node Affinity” 2. Scheduling Pods to Nodes Using Labels 3. Recap - NodeSelector 4. Node Affinity 5. Types of Node Affinity 6. Use Cases 7. DEMO: Scheduling Pods to Nodes using “Node Affinity” 8. Thank you For suggestions/feedback/doubts contact email: [email protected] Happy Learning !!! ======================================================================================== *USEFUL LINKS* ---------------------------- *Assigning Pods to Nodes* _https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/_ *Assigning Pods to Nodes using Node Affinity* _https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#node-affinity_ *API References* _https://kubernetes.io/docs/reference/kubernetes-api/_ *Kubectl Command Reference* _https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands_ ========================================================================================== #vsparkz #kubernetes #k8s #containers *DEMO STEPS* ------------------------- *Step 1: Access & Inspect the Kubernetes Cluster* $ kubectl cluster-info $ kubectl get nodes $ kubectl get pods -n kube-system *Step 2: Add custom labels to the Nodes* $ kubectl label nodes worker01.vsparkz.com webserver=nginx workertype=python size=small $ kubectl label nodes worker02.vsparkz.com webserver=apache workertype=python size=large *Step 3: Create & Schedule a Pod using “Required” Affinity Type* $ kubectl run nginx --image=nginx --dry-run=client -o yaml Copy the output content and create a file - schedule_using_required.yaml $ vi schedule_using_required.yaml _______________________________________________________ apiVersion: v1 kind: Pod metadata: name: nginx spec: containers: - image: nginx name: nginx affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: webserver operator: In values: - nginx _______________________________________________________ $ kubectl apply -f schedule_using_required.yaml $ kubectl get pods -o wide *Step 4: Create & Schedule a Pod using “Preferred” Affinity Type* $ vi schedule_using_preferred.yaml _______________________________________________________ apiVersion: v1 kind: Pod metadata: name: nginx spec: containers: - image: nginx name: nginx affinity: nodeAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 10 preference: matchExpressions: - key: size operator: In values: - large _______________________________________________________ $ kubectl apply -f schedule_using_preferred.yaml *Step 5: Create & Schedule a Pod using both “required” & “preferred” Affinity Type* $ vi schedule_using_both.yaml _______________________________________________________ apiVersion: v1 kind: Pod metadata: name: nginx spec: containers: - image: nginx name: nginx affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: workertype operator: In values: - python preferredDuringSchedulingIgnoredDuringExecution: - weight: 20 preference: matchExpressions: - key: size operator: In values: - large _______________________________________________________ $ kubectl apply -f schedule_using_both.yaml $ kubectl get pods -o wide ========================================================================================================================