kubernetes tutorial | Scheduling Pods to Nodes | Node Affinity | Demo
Certified Kubernetes Administrator
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kubernetes tutorial | Scheduling Pods to Nodes | Node Affinity | Demo
Description
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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
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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 !!!
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USEFUL LINKS
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Assigning Pods to Nodes
https://kubernetes.io/docs/concepts/s...
Assigning Pods to Nodes using Node Affinity
https://kubernetes.io/docs/concepts/s...
API References
https://kubernetes.io/docs/reference/...
Kubectl Command Reference
https://kubernetes.io/docs/reference/...
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#vsparkz #kubernetes #k8s #containers
DEMO STEPS
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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
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apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
containers:
image: nginx
name: nginx
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
matchExpressions:
key: webserver
operator: In
values:
nginx
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$ 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
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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
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$ kubectl apply -f schedule_using_preferred.yaml
Step 5: Create & Schedule a Pod using both “required” & “preferred” Affinity Type
$ vi schedule_using_both.yaml
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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
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$ kubectl apply -f schedule_using_both.yaml
$ kubectl get pods -o wide
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