Exam CKA topic 1 question 8 discussion

@pentium2000 it's not disk=ssd, it should be disk: ssd

https://kubernetes.io/docs/tasks/configure-pod-container/assign-pods-nodes/ apiVersion: v1 kind: Pod metadata: name: nginx-kusc00401 spec: containers: - name: nginx-kusc00401 image: nginx nodeSelector: disk=ssd

Hers first we have to do the node label. kubectl label no node02 disk=ssd then execute below code root@master:~# cat nodeSelector.yml apiVersion: v1 kind: Pod metadata: labels: run: nginx-kusc00401 name: nginx-kusc00401 spec: containers: - image: nginx name: nginx nodeSelector: disk: ssd root@master:~# then only pod will be in running state. root@master:~# kubectl get po -o wide | grep 401 nginx-kusc00401 1/1 Running 0 7m52s 10.0.2.128 node02 <none> <none> root@master:~#

first label the node or check if the label exist on the node kubectl get nodes --show-labels | grep -i disk=ssd if NOT exist then run - kubectl label node node01 disk=ssd then apiVersion: v1 kind: Pod metadata: name: nginx-kusc00401 spec: containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent nodeSelector: disk: ssd

For some reason, the code provided by Pentium or ScrewOnPrem didn;t work for me until I added the labels under metadata

apiVersion: v1 kind: Pod metadata: name: nginx-kusc00401 spec: containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent nodeSelector: disk: ssd this works for me

root@cka-master1:~ # kubectl label nodes cka-node1 disk=spinning root@cka-master1:~ # kubectl get nodes --show-labels root@cka-master1:~ # vim nodeselector.yaml apiVersion: v1 kind: Pod metadata: name: nginx-kusc00401 spec: containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent nodeSelector: disk: spinning # root@cka-master1:~ # kubectl apply -f nodeselector.yaml

The "nodeselector" arguement is looking a a label on the node. Use- kubectl get nodes --show-labels to check what that label actually is. The examples using "disktype" from the docs are using that because that is the label name that has been attached to the node. P.S. It's a ":" not a "=" -> disk: ssd

nodeSelector is the good and right path .. please don;t use nodeaffinity as its different